COMPLETE TRANSFORMER CATALOG No. 400G 1947

Transcription

TO GASSE.RCO.
402 E. MAIN ST
I HMO 0, V
COMPLETE TRANSFORMER CATALOG
No. 400G 1947
THORDARSON
ELECTRIC MANUFACTURING
DIVISION,
O11aguire c!Jnduslries c!Jnc.
CHICAGO,
ILLINOIS, U.S.A.
Catalog prices are list, subject to trade discount and change without notice. Variations of catalog items, i.e. change in primary voltages or frequencies, hermetically sealed, etc., are considered special and priced in keeping with experienced costs and quantities involved.
The letter separating the first two digits of the type number from the last two indicates the classification of the unit. The following legend wilfurther explain;
AC-
D F -
Audio
Choke
Type
No.
Page
R-1068X 6 & 13
4
T-20AOO
4
T-20A01
T-20A02
4
4
T-20A03
T-20A04
4
4
T-20A05
T-20A16
5
T-20AI7
5
T-20A19
5
5
T-20A22
T-20A23
5
T-20A24
5
T-20A25
5
T-20A26
8
T-20A40
5
T-20A41
5
T-20C50
6
T-20C51
6
T-20C52
6
T-20C53
6
T-20C54
6
T-20C55
6
T-20C56
6
T-20C57
6
T-20C58
6
13
T-20C60
13
T-20C61
17
T-20C73
List
Price
$4.15
2.40
3.40
3.50
3.00
2.10
10.00
2.40
2.60
2.60
3.20
3.50
4.10
7.50
7.50
20.00
20.00
3.00
1.80
1.80
2.50
4.25
4.75
7.75
30.00
2.00
14.00
17.00
16.00
Driver
Filament
Type
No.
;VI - Modulation
P - Plate
Page
T-20C74 6 & 13
T-20D75
8
T-20D76
8
T-20D77
8
T-20D78
8
T-20D79
8
T-20D80
8
T-20D81
8
T-20D82
8
T-20D83
8
T~21FOO
9
T-21FOl
9
T-21F02
9
T-21F03
9
T-21F04
9
T-21F05 9 & 13
T-21F06
9
T-21F07
9
T-21F08
9
T-21F1O
9
1'-21F11
9
T-21F12
9
T-21F14
9
T-21F15
9
T-21F16
9
T-21F17
9
T-21F18
9
9
T-21F19
T-21F20
9
Audio Input Transformers. . .. . . . . . . . .
4
Audio Interstage Transformers.
Audio Reactors.
..........
6
Automatic Voltage Regulators.
.22
Autotransformers. .
. .. 22
Band Pass 8peech Filter..
.
17
Broadcast Transformers.
. .. 24
Cathode Ray Power Transformers.
. ... 16
Chokes..
6
Compression Feedback Control
Transformers.
Driver Transformers.
Driver and Modulation
Combinations.
.
10 and 11
Dual Tone Control Choke and
Controls.
.6 and 13
Expansion Feedback Control Transformers 8
Filament Transformers.
9
List
Price
$3.25
2.25
2.50
3.75
5.00
4.25
5.90
7.50
7.50
24.00
3.25
4.20
5.00
3.30
5.60
5.00
5.50
7.50
2.70
3.25
5.60
5.50
3.60
4.00
5.50
6.25
5.00
7.50
8.50
Type
No.
T-21M50
T-21M52
T-21M54
T-21M56
T-21M58
T-21M60
T-21M61
T-21M62
T-21M64
T-21M65
T-21M66
T-21P75
T-21P77
T-21P79
T-21P81
T-21P82
T-21P83
T-21P85
T-21P87
T-21P89
T-21P91
T-21P93
T-22ROO
T-22ROl
T-22R02
T-22R04
T-22R05
T-22R06
T-22R07
R8-
Power
Output or 8peaker
List
Page
Price
12
12
12
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
14
14
14
14
16
16
16
16
16
16
16
$2.80
4.00
5.75
9.00
22.50
12.00
18.00
27.50
47.50
80.00
20.00
135.00
95.00
67.50
57.50
60.00
37.00
25.50
15.00
9.00
27.00
15.00
5.25
5.30
6.75
7.50
8.00
9.50
10.80
Type
No.
T-22R08
T-22R09
T-22R1O
T-22R11
T-22R20
T-22R22
T-22R24
T-22R30
T-22R31
T-22R32
T-22R33
T-22R34
T-22R35
T-22R40
T-22R42
T-22R43
T-22R44
1'-22845
1'-22846
1'-22847
1'-22848
T-22R50
1'-22856
1'-22858
1'-22860
1'-22862
1'-22864
1'-22866
1'-22868
Industrial Transformers. .
3
Isolation Transformers. .
. .22
Matched Power 8upplies.
. .. 14 and 15
Microphone Cable Transformers.
5
Modulation Transformers.
.
12
Mounting Characteristics Chart.
.
3
Multi-Match Modulation Transformers .. 12
Negative Peak Clipper Transformers ..... 13
Output Transformers.
.
20 and 21
Output Transformer Charts
18 and 19
Phase 8hift Transformers.
.
17
Photoflash Transformers. . .
.
22
Photographic Voltage Regulators.
.22
Plate 8upply Transformers.
.14
Power Transformers. . . . . . . . . . ..
.
16
Replacement Power Transformers
16
8platter Chokes.
13
Television Power Transformers. .
.16
V - Voltage Changer or Regulator
W - Wired Amplifier
List
Page
Price
16
16
16
16
9
9
9
16
16
16
16
16
16
16
22
22
22
20
20
20
20
17
20
20
20
20
20
20
20
$5.25
6.25
8.00
9.50
5.50
6.50
12.00
7.25
7.75
8.75
10.50
13.50
15.00
15.00
5.75
8.00
4.50
1.65
1.70
2.25
2.40
3.50
3.00
3.00
3.40
3.70
6.25
6.25
6.50
Type
No.
1'-22870
1'-22872
1'-22874
1'-22876
1'-22878
1'-22880
1'-22882
1'-22883
1'-22884
1'-22885
1'-22886
1'-22887
1'-22888
1'-22890
1'-22892
T-23VOO
T-23V01
T-23V02
T-23V05
T-23V06
T-23V1O
T-23V21
T-23V22
T-23V23
T-23V24
T-23V25
T-23V26
T-23V30
T-23V31
Page
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
22
22
22
22
22
22
22
22
22
22
22
22
22
22
List
Price
$7.00
7.00
5.25
5.50
9.50
4.00
8.00
5.50
3.90
3.40
2.75
3.00
3.25
4.50
10.00
57.50
65.00
90.00
135.00
50.00
230.00
10.00
12.00
15.00
20.00
16.00
32.00
50.00
60.00
Transceiver Transformers
.
. 4
Tropex. . . . . . . . . . . . .
.
.
3
Tru-Fidelity Transformers.
.24
Variable D.C. Power 8upplies.
. .. 17
Vibrator Power Transformers ...
. 9
Voltage Changers ..
.22
Literature
.
. .12
Amateur Radio
Amateur Pre-Amplifier and Driver
Amplifier Guide-Guide 346
Audio Amplifiers-Catalog 600
Broadcast Catalog-Catalog
500
Complete Transformer ManualCatalog 340
Phonograph and Recording Amplifier
Photographic Flash Circuit
Replacement Guide-Guide 352
Transmitter Guide-Guide 344
During the years 1939 to 1945, when urgencies demanded a period of
unprecedented technical development, Thordarson designed and produced units which were years ahead of normal progress. New materials and techniques were combined to create units which performed
with greater electrical efficiency and with increased economies of
space and weight. This invaluable experience, plus alert recognition
of present-day
industrial
and commercial demands, has enabled
Thordarson engineers, already veterans of more than 25,000 active
transformer
specifications,
to design the units described in this
catalog.
The Thordarson
line of transformers
and chokes, continuing
the
tradition of 52 unbroken years of leadership, has been streamlined
to conform with modern industrial trends. Manv
and standardized
individual units in the "New Line," utilizing the latest techniques
and materials, have been designed for wide-range applications. This
versatile construction
permits Thordarson
specialists to provide a
greater range of service with fewer catalog types and without sacrifice
of quality for any rated application.
All Thordarson
transformers
and chokes are rated accurately and
may be depended upon to fulfill their catalog specifications. Each
unit is subjected to rigorous control in every phase of manufacture
and final tests are made at full load under actual operating conditions.
The Thordarson reputation for reliability is safeguarded by every
precaution that modern engineering and control methods can devise.
Thordarson fully-potted units employ an especially developed compound which completely encloses both coil and core and provides
protection under severe operating conditions.
Hermetically sealed Thordarson transformers and chokes provide the
utmost protection in conditions of over 95% humidity. In addition
to the customary rigid electrical inspection, these units are subjected
to submersion tests.
All Thordarson transformers and chokes are available in hermetically
sealed or fully-potted cases, in both round and square mounting styles.
List prices are slightly higher than the corresponding general catalog
units.
When space and weight considerations indicate use of an open-frame
transformer
or choke, full coil protection may be provided by a
coating of Tropex. This factory-applied
process is exclusively Thordarson and is entirely impervious to deteriorating
effects caused by
salt-moisture
conditions. The Tropex coating is especially recommended for fine-wire audio coils.
Tropex treatment is applied to any Thordarson open-frame transformer or choke at slight additional cost. The small extra charge is
more than off-set by savings effected when units are employed under
adverse operating conditions. When ordering Tropex, add an "X"
to the regular type number. For example, T-20A02-X is the Tropex
equivalent of T-20A02.
Weight of Transformer
Life expectancy of transformers and chokes is seriously shortened by
salt air and high humidity. Minute absorption of salt-laden moisture
by material around a copper wire carrying a voltage causes an electrolytic action which may corrode and eventually break the wire. This
effect can occur with currents even smaller than a microampere and
is a common cause of equipment failure.
Deteriorating
electrolytic action occurs most frequently in transformers and chokes which carry a direct current potential above
ground and the effect is particularly noticeable in audio coils which
employ fine-wire construction. Power transformers are not nearly so
subject to damage because of the larger wire size used and because
of their characteristic
heat rise which minimizes absorption
of
moisture.
Up to
Ys
Add to List Price
lb ..
$ .70
1Ys Ibs ..
to 2Ys lbs ..
to 4Ys lbs ..
to 6Ys lbs ..
.95
From 1 lb. to
From 2 lbs.
From 3 lbs.
From 5 lbs.
1.20
1.50
2.10
Over 7 lbs ..
.35 per lb.
Common impregnating compounds, considered waterproof for most
purposes, are generally not satisfactory
for electrical applications.
Fully experienced Thordarson engineers are always ready to design
original transformers and chokes for any application. Our Engineering
Department welcomes inquiries for samples and price quotations. All
special units made to the rigid specsifications
of industrial applications. Standard
cases or specials are available
to meet specific
requirements.
BAH-BAV -BHH-CA V
Channel and open frame types
RAV-RTV-KTV
Completely enclosed, fully-potted
AGF-FGV-GGV
Shielded types with leads
PUV
Thordarson
transformers
and chokes are available in a variety of
mounting styles and cases. All units in the catalog illustrations and
listings are identified by alphabetical
abbreviations.
Weights and
dimensions of individual units are given with other specifications.
Fully enclosed, Cast-end
mounting
dud io (A) J.nput UranJ!ormerJ
~3l
+
For coupling a signal source to the gri d or grids of a Class A amplifier stage
Type
No.
List
Price
T-20AOO
$2.40
T-20A01
$3.40
Low Impedance Source (Microphone, Line or Mixer) to
Single or Push-Pull Grids
Mounting
Fig.
BAR
FGV
Applications
Line to grid
Ohms Impedance
Primary
Secondary
600 CT
60,000
Line to push-pull grids
600CT
60,000CT
Double-button mic or line to grid
200CT
20,000CT
50
20,OOOCT
Line
600CT
240,000
200CT
80,000
Double-button mic or line to grid
Single-button mic to grid
50
Centerleg Mtg.
X Stack Ctrs.
2
Y2xY2
1:10
'r
_2\Ob
r
.
T 'r
1:20
Dimensions
W.
D.
2%
H.
174: 1%
Weight
(Lbs.)
Y2
'["
;j6?~·,·~~15::.,
~36:~,
<;
••.
Single-button mic to grid or grids
to grid
Turns
Ratio
2% 2Ys
;lix;li
T
c
9
r
T
T
T
80,000
600CT
2% 2Ys
;lix;li
T T
T-20A05
$10.00
RTV
Line to push-pull grids
Double-button mic or line to
grid or grids
600CT
60,000:CT
1:10
and
5000-
Voice coil to grid
Low impedance mic to grid
200
250,000
3-6
38,400
50
2
r
r
10,000
+
BAR
H{. diam.
100,000
~l
T-20A04
lU6x1§{6
T
TTTTTT
200 CT 20,000 CT
(Primary current 40 MA)
Single-button mic to grid or grids
50
20,000 CT
(Primary current 40 MA)
* Rum Bucking coil and core construction fully potted and impregnated.
Single plate to grid
'r r
320,000
1:80
~_'J
Y2XY2
2
2%
IX
Y2
T-
IV,
1%
Y2
oIuJ io (A)
For coupling
~~E
Type
No.
T-20A16
T-20A17
T-20A22
T-20A23
the plate or plates
!JnterJtage UranJ!ormerJ
of an amplifier
stage to the grid or arids of the following
stage
where
grid current is not drawn
1]IE
List
Price
$2.40
Mtg.
Fig.
B'AR
2.60
3.20
3.50
FGV
BAR
FGV
Ohms Impedance
Primary
Secondary
10,000
40,000 CT
10,000
40,000 CT
10,000
90,000 CT
90,000 CT
10,000
Primary
Current
8MA
8MA
8MA
8MA
Turns
Ratio
1:2
1:2
1:3
1:3
SM
Centerleg
Stack
YzxYz
YzxYz
%x1
% xI
Mounting
Centers
2
12%2
2Ys
W.
Dimensions
D.
l>i
2%
2
1%
2Ys
2){6
3>i
2Ys
2%
Weight
(Lbs.)
H.
II)/g2
II){6
II%;
Yz
Yz
l>i
lYz
2§{6
'0
'OM
0
-Do
-5
20,000 CT 180,000 CT
(Split Secondary)
1l1i~
1t
8 MA
(balanced)
%x
~IE
1
Single or Push-Pull Plates to Single or Push·Pull Grids
Type
No.
T-20A19
List
Price
$2.60
T-20A25
(Fully potted;
Mtg.
Fig.
BAR
Ohms Impedance
Primary
Secondary
10,00090,000'::
20,000 CT
180,000CT
7.50
RTV
10,00020,00020,000 CT
40,000 CT
hum-bucking coil and core) (Split Secondary)
CURVES A,B,C
T-20A19
D
T-20A24
Primary
Current
8MA
1:1.41
Centerleg
Stack
% x %
Mounting
Dimensions
Centers
W.
D.
2;Ys2U){6··
1%
8 MA
(balanced)
I§{6 x H{6 1% diam.
H.
1%
2
13 r Xlt=
B
,CA
CURVE
Turns
Ratio
1:3
C-O
50K
V
Thordarson microphone cable transformers are designed to permit
rapid change from high- to low-impedance microphone input on any
amplifier. Frequency response is flat within lYz db from 30 to
15,000 cycles. Magnetic shielding minimizes hum pick-up. Connection
to the balanced primary is made with a two-prong microphone plug;
the unbalanced high-impedance secondary is connected to a standard
single-contact microphone receptacle. Exclusively Thordarson, compactly styled and ruggedly constructed, these units are inconspicuous
and will withstand hard usage.
Type
No.
T-20A40
List
Price
Mtg.
Fig.
$20.00
Z
T-20A41
20.00
----
Ohms Impedance
Primary
Secondary
30-60
50,000
200-250
TRANSFORMER
50,000
SPECIALISTS
Prices subject to change without
S NCE
notice.
Turns
Ratio
1:31.6
1:14.2
1895
Dimensions
Diameter
Length
1
1
1
1
Weight
(Lbs.)
%
Choke~ (C) J(eactor~
Universal"': Types -
Swinging and Smoothing
The design of a reactor determines its inductance values throughout
its operating range. Under all but highly specialized designs, the inductance will decrease as the D.C. current through it increases provided
the excitation voltage remains constant. The "Swinging" action is
used to ~dvantage to provide good regulation, with low ripple values,
in varying circuits, i.e., class "B" amplifier stages. Best regulation
and filtering will be obtained with the least investment, if the reactors
used swing only as much as necessary, and provide throughout their
entire range more inductance
than is dictated by the "critical
inductance" formula.
Load Resistance (Ohms)
Lcrit = -----------1000
L = Henries
Ripple Frequency-l20
cycles
Type
List
Price
Mtg.
Fig.
Zero
D.C.
Inductance
Rated
D.C.
Max.
D.C.
T20C50
$3.00
$1.80
BAR
475
350
75
5
T20C51
BAR
70
35
15
15
T20C52
$1.80
BAR
13
8
4
40
T20C53
$2.50
BAR
24
12
8
T20C54
$4.25
GGV
8
4
T20C55
$4.75
GGV
16
11
10
16
6
2
200
No.
T20C56
$7.75
GGV
T20C57
$30.00
PUV
A radically swinging choke will waste some of its possible
inductance at the higher current values.
useful
These TRORDARSON
UNIVERSAL
TYPES are scientifically
engineered to provide the best possible filtering and regulation in a
minimum size consistant with conservative design. One reactor may
be used in a single section filter with all the advantages of the radically
swinging type. Two similar units may be employed in a two section
filter more satisfactorily than the obsolete "swinging and smoothing"
system. For an actual comparison of the "Old" and "New Thordarson" circuits see regulation curves on page 14.
See pages 14 and 15 for choke applications and matched
supplies.
Current
Rated Max.
M.A. M.A.
D.C.
Res.
Ohms
RMS
Test
Volts
25
5500
25
1850
65
80
150
300
Mtg.
Centers
power
Max.
Excit.
Volts
W.
2000
500
2Ys
2
2
1200
250
2
2%
Wgt.
(lbs.)
1~
1)4
450
1200
150
2
1)4
375
2000
500
2Ys
~
~
100
2%
3)4
1%
1%
2
2
1~
200
145
2700
500
2xl1YI;;
21~
3Ys
75
2700
500
2)4x2
2Ys
2%"
3)4
331
3Ys
2~
3~
6~
6
26
7
4
300
375
60
3500
700
231x3
10
6
500
600
65
7500
1500
21>{6X7
D.
W.
3)4
3:li6
41>{6
D.
4:li6
7%,
H.
TUNED AUDIO CIRCUIT REACTOR
.75
.75
.75
0
10
30
1100
2%
DUAL TONE CONTROL COMPONENTS
T20C74
$3.25
RA V
22
(Hum Bucking Coil and Core)
220
500
Ih6
I%; Dia.
R1068-X
$4.15
Dual Tone Control Potentiometer.
See Page 13 or 346 guide for Circuit Details.
These representative curves below and on the following page show actual inductance values of the reactors when operated throughout
mended current range. All measurements for standardization
purposes have been made at 50 volts 60 cycles.
r=.""
~
ro-...
400
~~
200((
z
OO~
T-20C50
--- --- ----
.!.J
0
--- -......
sog
«>~
.
MA. D.C.
15
10
~?>°u
•.•..•...•...
.....•....••• •.•......
l.W
200:
MA.
Z
OW
R
........
20
25
~
D.C.
15
10
TRANSFOR
25
....••..•.•••
•.•.......
5
20
T-20C51
30ch
o ~
the recom-
SPECIALISTS
Price. ",bject to cha"Ke without "otice.
SINCE
1895
12 >-
log
co
8~
611'1
~
4~
2~
MA DC.
O.!.J
40
:I:
-0
U
T-20C53
co
:2.5:::-
20~
i5.~
100:
---- ----
I
Z
-5~
o ~
M.A. D.C.
10
30
20
40
0
T5~
50
70
60
T-20C54
->
120
----- -- -.............
-Ill
~Vl
W
~a:
MA. D.C.
~~
O.J
25
75
50
100
-~
6~
40:::
Z
2~
M.A.
30
60
90
I 0
D.C.
I!?O
110
MA DC.
50
(CO
10
15 r
f'-=-u
~~
ro
~~
240
-- --
W
~.a:
z
O.!.J
-
-~
210
~~
£~
2 )0
250
3CK>
--............
>'
a:
-ffi
2.5 ::z:
0
.!J
200
270
300
~
3S P
400
T-20C57
l2-~
5.
17~
T-20C56
12
10_0
~~
Ie 0
5
------ --------
.
o J
I
T-20C55
10~
8~
100
90
80
--
•••••••••••••••
""""-
MA. DC.
75
ISO
225
TRANSFORMER
300
SPECIALISTS
375
Pric.s sub;at to chong. without no#c•.
SINCE
450
1895
525
600
(D)
:briver
Specific
~E
Type
No.
UranJ!ormerJ.
Duty and Multi-Match Applications
OC
These driver transformers are all carefully designed to provide sufficient
primary inductance, proper turns ratio, and good regulation for the most
rigid driver requirements.
List
Price
Mtg.
Fig.
Driver Tubes
Application
Output Tubes
Application
Ratio
Pri. to
Y2Sec.
Pri.
MA
3
Mounting
W.
Dimensions
D.
Weight
W.
D.
H.
2
2%
1~
1%
Y2
2
2%
1~
1%
Y2
(Lbs)
1-30, 1-49, 1-6C5,
IH4, (Single Plate)
1-6N7, 6A6, 53, 1-76
(Single Plate)
lJ6, 19, 2-30, 2-49,
(Class B)
1-6N7, 6A6, 53
(Class B)
2.4:1
5.2:1
7
FGV
1-89, 6F6, etc. Triode
1-6C5, (Single Plate)
79,2-46, 59 (Class B)
2-6F6, 26L6 (Class AB2)
2.5:1
30
2%
2Ys
2Yt6 2?{6
1~
$5.00
GGV
40
2 x 11Yt6
2%
21Yt6 3Ys
2Y2
$4.25
FGV
2-6L6 (Class AB2)
2-6N7 (Class B)
2-6N7 etc.
(P-P Class B Grids)
4:1
T-20D79
2-6F6 etc. Triode
2-6A6, S3
2-6N7 etc.
(Single or P-P Pri.)
5.2:1
30
2%
2Ys
2Yt6 2?{6
lY2
T-20D80
$5.90
GGV
2-2A3, 45, 6L6
(P-P Pri.)
203A, T20, T55, 805
l00TH, etc. (Class B)
3.2:1
2:1
40
2 x l1Yt6
2%
21Yt6 3Ys
2Y2
T-20D81
$7.50
GGV
P-P 845, etc.
(P-P Pri.)
p-p 805, 833, etc.
(P-P Class B Grids)
5:1
50
2Y2x 2%
3%;
3YI6
4Y2
T-20D82
$7.50
GGV
2-2A3, 45, 6L6
(P-P Pri.)
P-P 805, 833 etc.
(P-P Class B Grid)
5:1
4:1
3.2:1
60
2 x l1Yt6
2%
21Yt6 3Ys
T-20D83
$24.00
PUV
Pri. 500 ohm Line
(Class B Grids)
Ratio 1:.75,1:.85,1:1.25,1:1.4
1:1.75, 1:2, 1:2.25, 1:2.5, 1:2.75, 1:3.
T-20D75
$2.25
BAH
T-20D76
$2.50
BAH
T-20D77
$3.75
T-20D78
3Ys
1% x 4%
3Ys
4
4~
~
2Y2
8
15 watts capacity
See pages 10 and 11 for specific driver applications not shown on this page. All driver transformers are packed with complete instructions describing their use.
Special inverse feedback control transformer T-20A26 is employed as the control element in a variable audio inverse feedback system that is
the basis of a recently developed compressor-expander circuit. In this new compressor-expander circuit the variable gain action is produced by
automatically controlling inverse feedback voltage. This system is
superior to the popular D.C. grid bias control of a variable mu tube
to obtain compression or expansion. The speed of response is faster
and the harmonic distortion does not rise with control action. This
fUDUCI
circuit has been incorporated into the design of a high fidelity 10
"TWon7
watt audio amplifier suitable for phonograph playback, AM - FM
radio tuner applications, and recording purposes. Each transformer
is packed with complete technical bulletin giving details of this amfEunel. tonill.
plifier or the information may be had by means of a mail request, $.15.
TIAUfOiMU
T-20UI
Type
No.
T-20A26
T20A26-is used in the New Thordarson Amateur Speech AmplifierDriver Unit to obtain effective volume compression action. See page
12 for further details.
List
Price
$7.50
Mounting
Mtg.
Fig.
Application
RTV
Feedback Transformer
Dimensions
---------
------
TRANSFORMER
W.
SPECIALISTS
Prices subject to change without notice.
D.
SINCE
D.
H.
1% Dia.
2
W.
I%; x 1~6
1895
Weight
(Lbs.)
Y2
))
(D) VranJlormerJ
~river
~~[
Specific
Duty and Multi-Match Applications
OC
These driver transformers are all carefully designed to provide sufficient
primary inductance, proper turns ratio, and good regulation for the most
rigid driver requirements.
Oriver Tubes
Application
Ratio
Pri. to
Yz Sec.
Output Tubes
Application
Mounting
Pri.
MA
Type
No.
List
Price
Mtg.
Fig.
T-20075
$2.25.
BAH
1-30, 1-49, 1-6C5,
IH4, (Single Plate)
136, 19, 2-30, 2-49,
(Class B)
2.4:1
3
T·20076
$2.50
BAH
1-6N7, 6A6, 53, 1-76
(Single Plate)
1-6N7, 6A6, 53
(Class B)
5.2:1
7
T·20077
$3.75
FGV
1-89, 6F6, etc. Triode
1-6C5, (Single Plate)
79, 2-46, 59 (Class B)
2-6F6, 26L6 (Class AB2)
2.5:1
T-20078
$5.00
GGV
2-6F6 etc. Triode
2-6A6, S3
2-6L6 (Class AB2)
2-6N7 (Class B)
T-20079
$4.25
FGV
2-6N7 etc.
(Single or P-P Pri.)
T-20080
$5.90
GGV
T-20081
$7.50
T-20082
T-20083
Oimensions
Weight
(Lbs)
W.
O.
H.
2
2%
17;1
1%
Yz
2
2%
17;1
1%
Yz
30
2%
2Ys
2){6
2%
17;1
4:1
40
2 x 11){6
2%
21){6
3Ys
2Yz
2-6N7 etc.
(P-P Class B Grids)
5.2:1
30
2%
2Ys
2){6
2VI6
lYz
2-2A3, 45, 6L6
(P-P Pri.)
203A, T20, T55, 805
100TH, etc. (Class B)
3.2:1
2:1
40
2 x 11){6
2!){6
21){6
3Ys
2Yz
GGV
P-P 845, etc.
(P-P Pri.)
P-P 805, 833, etc.
(P-P Class B Grids)
5:1
50
2Yz x 2VI6
3VI6
3YI6
3Ys
4Yz
$7.50
GGV
2-2A3, 45, 6L6
(P-P Pri.)
P-P 805, 833 etc.
(P-P Class B Grid)
2
2%;
21){6 3Ys
2Yz
$24.00
PUV
Pri. 500 ohm ·Line
(Class B Grids)
Ratio 1 :.75, 1 :.85, 1 :1.25, 1 :1.4
1:1.75,1:2,1:2.25,1:2.5,1:2.75,1:3.
See pages 10 and 11 for specific driver applications
ing their ljse.
5:1
4:1
3.2:1
W.
60
O.
x 11){6
3Ys
1~ x 4%
4
4~
)\
8
15 watts capacity
not shown on this page. All driver transformers
are packed with complete instructions
describ-
Special inverse feedback control transformer T-20A26 is employed as the control element in a variable audio inverse feedback system that is
the basis of a recently developed compressor-expander
circuit. In this new compressor-expander
circuit the variable gain action is produced by
automatically
controlling
inverse feedback
voltage.
This system
is
superior to the popular D.C. grid bias control of a variable mu tube
to obtain compression
and the harmonic
or expansion.
distortion
The speed of response is faster
does not rise with control action. This
circuit has been incorporated
into the design of a high fidelity
watt
for phonograph
audio amplifier
suitable
radio tuner applications,
playback,
and recording purposes.
10
AM - FM
Each transformer
is packed with complete technical bulletin giving details of this amHEDUCK.
COlITtOL
plifier or the information
UANSfOiMEIt
T·1OA1~
may be had by means of a mail request, $.15.
T20A26-is used in the New Thordarson
Amateur
Speech Amplifier-
Driver Unit to obtain effective volume compression
action. See page
12 for further details.
Type
No.
--
T-20A26
List
Price
$7.50
Mtg.
Fig.
RTV
Mounting
W.
Application
Feedback
TRANSFORMER
SPECIALISTS
to change without
O.
W.
l§.{6x I§{6
Transformer
Prices subject
Oimensions
notice.
SINCE
1895
O.
1% Dia.
H.
2
Weight
(Lbs.)
Yz
)>>
9ilament (F) uran~tormer~
All Standard Thordarson filament transformers are wound with a single
secondary. Improved voltage regulation and minimum heat rise have been
given full design consideration. Ratings are for continuous operation at
peak load and from a 117-volt, 50/60-cycle source.**
Type
No.
T-21FOO
T-21F01
T-21F02
T-21F03
T-21F04
T-21F20
T-21 F05*
T-21F06
T-21F07
T-21F08
T-21F10
T-21 F11
T-21F12
T-21F14
List
Price
$3.25
4.20
5.00
3.30
5.60
8.50
5.00
5.50
7.50
2.70
3.25
5.60
5.50
3.60
Ins.
Secondary
Mounting
Dimensions
Volts
Amperes
RMS
Centers
W.
D.
2Ys
BAV
2.5CT
1600
5
I%:
2%
21Yt6
BAV
2.5CT
10
1600
3§{6
2
2.5 CT
10
CAY
7500
2xl%:
274;
2%
2Ys
BAV
5CT
1600
3
2%
I%:
1600
5CT
2xl%:
CAY
7
274;
2%
15
10000
CAY
5CT
3x2%
3%:
374;
10000
CAY
5CT
3
2xl%:
274;
2%
13
1600
2x2
CAY
5CT
2%
2%
CAY
5CT
21
1600
2%x274;
374;
3%
1
2
BAV
6.3CT
1600
1%
2%
BAR
1600
6.3CT
3
2%:
374;
I%:
6.3CT
1600
CAY
6
2xl%:
274;
2%
CAY
6.3CT
10
1600
2x2
2%
2%;
6.3-5-2.5
2.5
BAR
1600
2%;
374;
I%;
(tapped secondary)
T-21F15
4.00
21Yt6
BAV
7.5CT
4
1600
3§{6
2
T-21F16
5.50
1600
CAY
7.5CT
8
2x2
2%;
2%
21%;
T-21F17
6.25
12
1600
CAY
7.5CT
274;x274;
374;
T-21F18
5.00
10CT
5
1600
CAY
2xl%;
274;
2%
T-21F19
7.50
10CT
12
CAY
1600
2%x274;
374;
3%
11
or 11 CT
(tapped primary)
uFilament transformers with the above electrical characteristics are also available with fully potted or hermetically sealed
in Special Transformer section of catalog. Other primary voltages and frequencies may be had on special order.
*Filament transformer T-21F05 is used with the splatter suppressor circuit described on page 13.
=t=
Type
No.
T-22R20
T-22R22
T-22R24
Mounting
21Yt6
3Yt6
3%
3Yt6
31 %
Mounting
CAY
CAY
GGV
Primary
6-8VDC
6-8VDC
6·8VDCor117VAC
High-Voltage
Secondary
250 V DC, 50 MA
325 V DC, 75 MA
325 V DC, 135 MA
Secondary
No.2
6.3 V CT, 4.75 A
Mounting
Centers
2xl%:
2x2%
3x3J16
1%
2%;
4
274;
574;
mountings as shown
=t=
VIBRATOR POWER TRA'N'SFORMERS
List
Price
$5.50
6.50
12.00
Weight
(Lbs.)
1
1%
274;
1
274;
6%:
2
2;li
574;
%:
1
274;
2%;
1
H.
2§{6
21Yi6
3Yt6
2§{6
3Yt6
4!l{6
3Yt6
3Yt6
31~6
2
2
3Yt6
3Yt6
2
Dimensions
Weight
W.
D.
H.
(Lbs.)
2%
274; 3Yt6
2%
3
3Yt6
2%
3%
4%;
31~6 4~6
8%;
Thordarson Vibrator Power Transformers are constructed of highest
quality core material to assure operation with minimum battery drain
and excellent voltage regulation. These units are recommended for
replacement service in automobile receivers and for initial installation in power supplies for portable public address systems, trans-
IISVA.C.
==~
60C
1::~6VDC
ceivers, and other equipment.
B D
r
JGECA
FEMALE
TRANSFORMER
SPECIALISTS
SINCE
1895
H
FUSE
CONNECTORS
3Jriver anJ ~oJu[ator
p.p
Tube 'ClauB
Type Tubes
R.46
C.46
A.46
~
.4,-46
203A
203A
203A
203A
•.•203A
~A
•.•203A
•.•203A
211
211
800
800
800
801
801
801
801
805
805
806
806
808
809
809
809
809
810
811
811
838
838
4-838
4-838
4-838
4-838
T
A
Y
L
T-2O
T-20
TZ-2O
TZ-40
o TZ-40
R TZ-40
TZ-40
T-55
T-55
T-55
T-155
203-A
.4,-203A
HD-203A
HD-203A
HD-203A
HD-203A
HD-203A
HD-203A
HD-203A
HD-203A
HD-203A
203B
4-203B
4-203B
203Z
203Z
203Z
211
T-756
T-756
T-814
T-814
-822
10
Power
Output
Watts
30
~
50
56
96
200
200
260
260
(()()
(()()
520
520
200
260
90
100
100
.4,5
.4,5
75
75
300
370
500
500
190
60
60
100
100
510
175
225
200
260
400
400
520
520
MODULATOR STAGE
PI. to PI.
Load
Pille
Bias
Volts
Ohms
Volts
(()()
0
5,600
8,000
500
0
600
0
9,600
400
0
2,800
.4,,800
0
600
-35
1000
6,900
-35
6,900
1000
-4.'i
1250
9,000
--45
1250
9,000
-35
1000
3,~
4,500
1000
-35
--45
3,450
1250
-4.'i
4,500
1250
-77
6,900
1000
9,000
1250
-100
-40
750
6,400
-55
12,500
1000
-55
12,500
1000
-75
10,000
600
10,000
600
-75
11,000
-80
750
-80
11,000
750
6,700
1250
0
1500
8,200
-16
11,500
2000
-150
-150
11,500
2000
-15
12,700
1250
500
5,200
0
5,200
500
0
8,400
750
-5
750
-5
8,400
1500
-30
6,600
15,000
1250
0
-9
18,000
1500
1000
6,900
0
9,000
1250
0
3,450
1000
0
3,450
1000
0
4,500
1250
0
4,500
1250
0
Driver
Tubes
*~
*4.5
*4.5
*~
*4.5
t2A3
**6L6
t2A3
**6L6
t •.•2A3
**6L6
t4-2A3
**6L6
2A3
2A3
2A3
2A3
T-21M61
T-21M62
T-21M62
T-21M64
T-21M64
T-21M64
T-21M64
T-21M64
T-21M64
T-21M64
*45
*45
*45
2A3
45
2A3
45
2A3
2A3
2A3
600
800
800
1000
1000
750
750
1000
1250
1500
HD-203A
RCA 203A
-30
-40
0
0
0
0
0
8,100
12,000
12,000
6,800
6,800
6,000
6,000
6,900
9,400
12,000
300
300
400
400
500
500
500
600
600
300
600
600
200
260
300
Same as
100
125
500
500
Same as
1500
1750
1750
2000
2000
1500
1500
1750
1750
1250
1250
1250
1000
1100
1250
RCA 211
850
850
2000
2000
HD-203A
-50
-67.5
-67.5
-75
-75
-50
-50
-67.5
-67.5
-45.
-45
-45
0
0
0
9,600
13,000
10,000
12,500
10,000
6,400
6,400
7,600
7,600
7,900
3,900
3,900
6,900
6,700
7,900
T-21M64
T-21M64
T-21M65
T-21M65
T-21M65
T-21M65
T-21M65
T-21M65
T-21M65
T-21M64
T-21M65
T-21M65
T-21M64
T-21M64
T-21M64
9,400
7,500
11,500
11,500
T-21M62
T-21M62
T-21M65
T-21M65
-25
-25
-150
-150
TRANSFORMER
p.p
Use Mod.
Trans. No.
T-21M61
T-21M61
T-21M61
T-21M61
T-21M62
T-21MM
T-21M6.4,
T-21MM
T-21MM
T-21M65
T-21M65
T-21M65
T-21M65
T-21MM
T-21M64
T-21M62
T-21M62
T-21M62
T-21M61
T-21M61
T-21M62
T-21M62
T-21M64
T-21M65
T-21M65
T-21M65
T-21M64
T-21M61
T-21M61
T-21M62
T-21M62
T-21M65
T-21M64
T-21M64
T-21M64
T-21M64
T-21M65
T-21M65
T-21M65
T-21M65
50
70
70
175
175
100
100
175
225
275
Same as
Same as
-40
-50
-60
Combination4
SPECIALISTS
~
2A3
45
45
2A3
2A3
2A3
4-2A3
**6L6
2A3
2A3
45
2A3
45
4-2A3
2A3
2A3
2A3
2A3
4-2A3
**6L6
4-2A3
**6L6
DRIVER STAGE
Trans. for
Trans.
Ratio. Pri. Use Driver
500 Ohm
to ~ Sec. Trans. No.
Line
T-2OD82
T-20D83
5:1
T-2OD82
T-2OD83
5:1
T-2OD82
T-2OD83
5:1
T-20D82
T-2OD83
5:1
T-2OD82
5:1
T-20D83
T-2OD80
2:1
T-20D83
3.2:1
T-2ODSO
T-20D83
T-2OD80
T-2OD83
2:1
T-2OD80
3.2:1
T-2OD83
T-2OD80
T-2OD83
3.2:1
T-2OD80
T-20D83
3.2:1
2:1
T-2OD80
T-20D83
T-2OD80
T-2OD83
3.2:1
T-2ODSO
2:1
T-20D83
T-20D80
T-20D83
2:1
3.2:1
T-20D80
T-2OD83
T-20D80
3.2:1
T-20D83
2:1
T-20D80
T-20D83
T-20D80
T-20D83
3.2:1
2:1
T-20D80
T-20D83
T-20D80
2:1
T-20D83
T-20D80
T-2OD83
3.2:1
T-20D82
3.2:1
T-20D83
T-20D82
T-2OD83
3.2:1
T-2OD80
2:1
T-2OD83
2:1
T-20D80
T-20D83
T-20D80
3.2:1
T-20D83
T-2OD82
5:1
T-20D83
4:1
T-20D82
T-20D83
T-2OD82
5:1
T-20D83
4:1
T-20D82
T-20D83
T-20D82
3.2:1
T-20D83
T-20D82
T-2OD83
5:1
T-20D82
5:1
T-20D83
T-20D82
T-20D83
4:1
4:1
T-20D82
T-2OD83
T-20D82
3.2:1
T-20D83
T-20D82
4:1
T-2OD83
3.2:1
T-20D82
T-20D83
T-2OD82
4:1
T-20D83
T-20DSO
T-20D80
T-2OD80
T-20D82
T-20D82
T-2OD82
T-20D82
T-20D80
T-20D80
T-20D80
T-20D83
T-2OD83
T-2OD83
T-20D83
T-20D83
T-20D83
T-2OD83
T-20D83
T-20D83
T-20D83
1:2
1:2.25
1:1.4
1: .85
1:1.5
1: .75
1:1.4
1:1.25
1:1.4
1:1.4
2A3
2A3
2A3
2A3
2A3
4-2A3
**6L6
4-2A3
**6L6
t2A3
t4-2A3
**6L6
2A3
t2A3
t2A3
3.2:1 .
T-2OD80
T-2OD80
3.2:1
2:1
T-20D80
2:1
T-2OD80
T-20D80
2:1
. T-20D80
2:1
3.2:1
T-2OD80
2:1
T-20D80
3.2:1
T-20D80
2:1
T-20D80
T-20D80
2:1
3.2:1
T-20D80
T-20D82
5:1
4:1
T-2OD82
T-20D82
4:1
T-20D83
T-20D83
T-2OD83
T-2OD83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
1:1.25
1:1.25
1:1.75
1:1.75
1:1.75
1:1.25
1:1.4
1:1.4
1:1.75
1:2
1:1.4
1:1.75
1: .75
1: .85
1: .85
2A3
2A3
4-2A3
**6L6
3.2:1
2:1
2:1
2:1
T-20D80
T-20D80
T-20D80
T-2OD80
T-20D83
T-2OD83
T-20D83
T-20D83
1:1.25
1:1.75
1:2
1:3.15
PriCts subject to change without notice.
2:1
2:1
3.2:1
4:1
3.2:1
5:1
3.2:1
3.2:1
3.2:1
3.2:1
§Ratlo 500
Ohm Line
to ~ See.
1: .86
1: .86
1: .85
1: .85
1: .85
1:1.5
1:1.25
1:1.5
1.1:25
1:1.25
1:1.25
1:1.25
1:1.25
1:1.75
1:2
1:1.25
1:1.25
1:1.2
1:1.25
1:2.25
1:2.25
1:1..4,
1:1.25
1:1.25
1:2
1:2.5
1:1.25
1: .75
1:1.25
1: .75
1:1.25
1:1.25
1: .85
1:1.25
1: .85
1: .85
1: .75
1:1.25
1: .75
1:1.25
SINCE
1895
1:
c1)river
Tube
Type
poP
Class B
Tubes
Power
Output
Watts
DRIVER STAGE
Trans. for
Use Driver
500 Ohm
Trans. No.
Line
T-21M64
T-21M64
T-21M64
T-21M64
T-21M64
T-21M65
T-21M64
T-21M64
T-21M64
T-21M65
T-21M64
T-21M65
T-21M65
2A3
2A3
2A3
2A3
2A3
2A3
**6L6
**6L6
**6L6
**6L6
**6L6
**6L6
**6L6
2:1
2:1
3.2:1
3.2:1
3.2:1
3.2:1
2:1
2:1
2:1
2:1
3.2:1
3.2:1
3.2:1
T-2ODSO
T-2OD80
T-20D80
T-2OD80
T-2OD80
T-2OD80
T-20D80
T·20D80
T-20D80
T-20D80
T-20D80
T-20D80
T-2OD80
T-2OD83
T-2OD83
T-2OD83
T-20D83
T-20D83
T-2OD83
T-20D83
T-20D83
T-2OD83
T-2OD83
T-20D83
T-20D83
T-2OD83
0
0
8,700
12,000
12,000
13,600
17,000
13,600
17,000
7,200
10,000
6,700
8,200
6,900
9,000
T-21M62
T-21M62
T-21M62
T-21M62
T-21M64
T-21M62
T-21M64
T-21M64
T-21M64
T-21M64
T-21M65
T-21M64
T-21M64
2A3
*.5
2A3
*45
*45
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
5:1
3.2:1
4:1
4:1
4:1
5:1
5:1
4:1
4:1
3.2:1
3.2:1
4:1
4:1
T-2OD81
T-2OD82
T-2OD82
T-2OD82
T-20D82
T-2OD81
T-20D81
'T-2OD82
T-20D82
T-20D80
T-20D80
T-2OD82
T-20D82
T-2OD83
T-2OD83
T-20D83
T-20D83
T-2OD83
T-2OD83
T-20D83
T-20D83
T-20D83
T-2OD83
T-2OD83
T-2OD83
T-2OD83
1: .75
1:1.75
1: .85
1:1.25
1:1.25
1: .75
1: .75
1: .85
1: .85
1:1.25
1:1.25
1: .85
1: .85
800
800
1000
800
1000
1000
-9
-28
-37.5
-9
-35
-35
9,000
5,800
7,000
9,000
7,000
7,000
T-21M62
T-21M64
T-21M64
T-21M62
T-21M6.
T-21M64
2A3
2A3
2A3
2A3
2A3
2A3
5:1
3.2:1
3.2:1
5:1
4:1
.:1
T-2OD81
T-20D80
T-2OD80
T-20D81
T-2OD82
T-20D82
T-2OD83
T-20D83
T-20D83
T-2OD83
T-20D83
T-20D83
1: .75
1:1.25
1:1.25
1: .75
1: .85
1: .85
260
350
150
200
245
300
500
500
600
500
600
1500
1750
750
1000
1250
1500
2000
2500
2500
2000
2500
-52
-62
12,000
16,000
4,800
6,900
9,000
11,200
11,200
16,000
16,000
11,200
16,000
T-21M64
T-21M65
T-21M64
T-21M64
T-21M64
T-21M64
T-21M65
T-21M65
T-21M65
T-21M65
T-21M65
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
**6L6
**6L6
3.2:1
3.2:1
4:1
4:1
4:1
4:1
2:1
2:1
2:1
3.2:1
3.2:1
T-20D80
T-20D80
T-20D82
T-20D82
T-20D82
T-20D82
T-20D80
T-20D80
T-20D80
T-20D80
T-20D80
T-20D83
T-20D83
T-2OD83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-20D83
T-2OD83
T-20D83
1:1.25
1:1.4
1: .85
1: .85
1: .75
1: .85
1:1.75
1:1.75
1:1.75
1 :1.75
1:1.75
45
105
170
200
200
223
240
328
418
100
220
400
319
472
595
290
4-45
500
1000
1250
1500
1000
1250
1500
2000
2500
1000
1500
2000
1500
2000
2500
1500
2000
6,400
15,000
12,500
16,800
7,500
11,400
10,000
16,000
22,000
15,000
15,000
15,000
10,000
11,000
16,000
12,000
12,000
T-21M61
T-21M62
T-21M64
T-21M64
T-21M64
T-21M64
T-21M64
T-21M65
T-21M65
T-21M62
T-21M64
T-21M65
T-21M64
T-21M65
T-21M65
T-21M64
T-21M65
5:1
3.2:1
3.2:1
3.2:1
2:1
2:1
2:1
2:1
2:1
3.2:1
2:1
2:1
2:1
2:1
2:1
3.2:1
3.2:1
T-20D82
T-20D82
T-20D80
T-2ODSO
T-20DSO
T-2OD80
T-2ODSO
T-2OD80
T-2OD80
T-ZOD80
T-2OD80
T-20D80
T-2OD80
T-20D80
T-2OD80
T-2ODSO
T-20D80
T-2OD83
T-2OD83
T-2OD83
T-2OD83
T-2OD83
T-20D83
T-2OD83
T-2OD83
T-20D83
T-2OD83
T-2OD83
T-20D83
T-2OD83
T-2OD83
T-2OD83
T-20D83
T-2OD83
1: .75
1:1.25
1:1.4
1:1.4
1:2.25
1:2.75
1:1.75
1:1.75
1:1.75
1:1.25
1:1.75
1:2.25
1:1.25
1:1.25
1:1.4
1: .85
1: .85
RK-12
RK-18
RK-18
RK-31
RK-31
RK-31
o RK-31
N RK-52
RK-52
RK-57
RK-57
RK-58
RK-58
100
100
100
110
140
110
140
200
250
300
370
200
260
750
1000
1000
1000
1250
1000
1250
1000
1250
1250
1500
1000
1250
H
Y
T
R
HY-25
HY-40
HY-40
HY-57
o HY-51A
N HY-5IB
75
140
175
110
180
180
A
M
P
E
R
E
X
HF-I00
HF-l00
ZB-120
ZB-120
ZB-l20
ZB-120
HF-200
HF-200
HF-200
HF-200
HF-200
H
E
I
N
T
Z
HK-24
HK-24
HK-54
HK-54
HK-I54
HK-I54
HK-254
HK-254
HK-254
HK-354
HK-354
HK-354
354E
354E
354E
354F
354F
K
A
U
F
M
A
N
Trans.
Ratio, Prl.
to ~ Sec.
7,200
9,600
5,200
7,200
9,600
16,000
5,200
7,200
9,600
16,000
4,000
5,200
6,400
1000
1250
1000
1250
1500
2000
1000
1250
1500
2000
1000
1250
1500
&
pop
Driver
Tubes
§Ratio 500
Ohm Line
to 72 See.
1:1..
1:1.5
1:1.25
1:1.25
1:1.25
1: .85
1:2
1:2.5
1:2.5
1:2.5
1:1.25
1:1.25
1:1..
150
200
210
260
300
380
170
230
270
350
300
400
500
R
A
Y
T
H
E
~oJu[ator Cambination~
MODULATOR STAGE
PI. to PI.
Load
Plate
Bias
Volts
Volts
Ohms
35T
35T
l00TH
l00TH
l00TH
l00TH
l00TL
l00TL
l00TL
l00TL
250TH
250TH
250TH
E
I
M
A
C
WoE 242A, 261A, 276A
(
..
anJ
-22
-30
-10
-20
-90
-112
-140
-185
°°
0
0
-22.5
0
-50
-50
°
-16
-9
-100
-130
-130
-100
-130
-29
-35
-45
-155
-210
-10
-55
0
0
0
0
0
0
0
0
0
0
-SO
-60
-100
-150
-25
-37.5
-50
-15
-22.5
Use Mod.
Trans. No.
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
2A3
4-2A3
4-2A3
4-2A3
4-2A3
4-2A3
Same as ReA 211
§NOTE:-This ratio is correct only when the tubes supplying power to the 500 ohm line are of the same type and operated under the same conditions as the driver tubes listed under "p_p Driver Tubes." 2A3 driver tubes are operated with 300 plate volts, self biased, unless preceded by t.
45 driver tubes are operated with 275 plate volts, self biased, unless preceded by *. t2A3 driver tubes are operated with 300 plate volts fixed bias
*45 driver tubes are operated with 250 plate volts, self biased.
**6L6's with 16.6% resistive feed-back, 400 volts plate, 300 volts screen.
TRANSFORMER
SPECIALISTS
Prices subject to chante without notice.
SINCE
1895
11
(M)
-AtoJulation
Modulation
UranJ!ormerJ
CM) Transformers
for Specific Applications
Impedance
Type
No.
T-21M50
T-21M52
T-21M54
T-21M56
T-21M58
List
Price
$2.80
4.00
5.75
9.00
22.50
Mtg.Fig.
BAR
FGV
GGV
GGV
KTV
Primary
Application
1-19 etc.
6N7 etc.
pop 6L6 etc.
TZ2-809
etc.
811-812 etc.
Primary
10,000 C.T.
10,000 C.T.
6,600 C.T.
10,000 C.T.
15,000 C.T.
Dimensions
Mounting
Secondary
4500
4500-3750-3000
4000
6600-3750
6250
Sec.
Power
.03A-135V
.08A-350V
.lA-400V
.2A-1250V
.2A-1250V
Audio
Power
3
10
25
75
100
W.
2
D.
2
2%
2 x 11%'6
2Y2 x 21%'6
3Y2 x 4Y(6
W.
D.
2%
2U6
2Vt6
3Vt6
4Vt6
1%
1%
2Vt6
2Y(6
21%'6 3Ys
4Vt6 3Ys
51J{6
H.
5%
Weight
Lbs.
Yz
1%
2%
6%
13
High efficiency, quiet operation and good frequency characteristics
have been attained in this series of transformers by thorough engineering
and careful construction.
These units are designed for specific tube types. Larger modulation transformers are available on special order. Please
consult the Thordarson Sales Engineering Department concerning special requirements.
Multi-Match
Type
No.
T-21M60
T-21M61
T-21M62
T-21M64
T-21M65
List
Price
$12.00
18.00
27.50
47.50
80.00
Secondary
Mtg.
Fig.
KTV
PUY
PUV
PUV
PUV
Primary M.A.
Each Side
50
125
210
250
320
Series
50
125
160
250
320
M.A.
Mounting
Audio
Power
15
60
125
300
500
Parallel
100
250
320
500
640
These transformers enable the radio amateur or experimenter to make
changes in equipment to take advantage of new circuits and tubes.
They enable quick and accurate matching of various tube loads without changing transformers, and assure peak transformer performance
while testing new tubes or making circuit changes. A complete table'
KTV
CM) Transformers
Modulation
TRANSFORMER
SP
W.
2J{6
1%
2Vt6
21J{6
3J{6
D.
2Y2
W.
21%'6
D.
4%
3Ys
5%
6%
7%
11
6Ys
6Ys
10
4Y(6
41Y(6
5%'6
31Y(6
H.
4
4
5~6
6
6Ys
Weight
Lbs.
~.
3%
8%
16%
20
55
of driver and modulator combinations on pages 10 and 11 makes easy
the selection of proper driver or modulation transformers.
Larger
modulation transformers are available on special order. Please consult
the Thordarson
Sales Engineering
Department
concerning special
requirements.
Pri. 500 ohms-Sec.
5M-6M-7M-8M-9M-lOM
Sec. Max. D.C. 200 M.A.
A carefully prepared
AMATEUR RADIO by J. Douglas Fortune.
textbook for radio beginners and amateurs profusely illustrated and
bound in a heavy cover. Amateur net price
$ .75
THORDARSON
AUDIO AMPLIFIERS
(Catalog 600). This new
catalog covers a complete line of audio amplifiers for public address
work and other audio applications
from 8 watts to multi-booster
installations
Free
THORDARSON
AMPLIFIER GUIDE (Guide 346). This guide is a
valuable source of information
to the P.A. man and experimenter
interested in building high quality audio amplifiers
$ .15
THORDARSON
TRANSMITTER
GUIDE (Guide 344). This publication supplies complete descript~on of practical types of transmitters and short wave apparatus for amateurs and experimenters. $ .15
THORDARSON
COMPLETE TRANSFORMER
MANUAL (Catalog
340). This transformer manual is a complete book containing all of
the latest Thordarson catalogs, guides and current literature ... $ .35
THORDARSON
BROADCAST CATALOG (Catalog 500). This catalog supplies a complete listing of the Thordarson Broadcast Line as
well as the Tru-Fidelity
transformers
for low level audio applications
Free
Dimensions
------
50
THORDARSON
REPLACEMENT
ENCYCLOPEDIA
GUIDE
(Guide 352). This replacement encyclopedia is a useful time saver
for servicemen and experimenters showing recommended Thordarson
items for obsolete receivers
$ .15
AMATEUR PRE-AMPLIFIER
AND DRIVER.
This manual thoroughly covers the construction
and application of a 6B4 10 watt
amplifier. Speech filter as well as compression circuit is incorporated.
Complete circuit details and construction data supplied
$ .15
PHONOGRAPH
REPRODUCTION
AND RECORDING
AMPLIFIER. The data sheets covering this high fidelity amplifier give full
construction information and layout data. The output stage consists
of 2-6B4j an expander circuit is incorporated
$ .15
PHOTO-FLASH
POWER SUPPLY. Complete descriptive literature
covers the construction of a practical power supply for photo-flash
applications
(See page 22). Trigger circuits and applications
are
listed
$ .15
AMATEUR TRANSMITTER.
Technical bulletin covering the construction of a 230 W Phone, 275 W C.W. or 400 W C.W. Transmitter.
All band operation
$ .15
IALISTS
SINCE
1895
J.
(C)
$platter
$uppreJJor Choke
'Phone transmission on the crowded amateur bands is greatly improved by a splatter suppressor circuit using Thordarson components.
The circuit limits tran~mission to the important voice frequencies,
effectively reduces splatter interference caused by high levels of modulation and permits a higher average modulation level.
Attenuation
of audio modulating frequencies over 3000 C.P.S. and
elimination of harmonics generated in the speech amplifier and
modulator permits sharper signals.
The half-wave rectifier is an efficient negative peak clipper which
prevents plate voltage on the Class C amplifier from going below
zero when the 100% modulation level is exceeded.
The rectifier confines the negative peaks to the audio circuit rather
than applying .them to the R.F. stage.
The combined action of the filter and clipper suppresses radiation of
undesirable harmonics which cause excessively wide side-bands and
adjacent channel interference.
The filament transformer meets special requirements for this application. The secondary winding has low capacity to ground and is
insulated for very high voltages.
Type
List
Price
$14.00
17.00
5.00
No.
T-20C60
T-20C61
T-21F05
Mtg.
Fig.
KTV
KTV
CAY
Inductance
Inductance
5 V.C.T.-3A
The circuit is ideal for use in original transmitter design and is readily
adaptahle to existing installations, either as a part of the modulator
or assembled on a separate chassis. There are no difficult adjustments
and complete instructions simplify design and assembly of the circuit
for cut-off at any frequency over a wide range ahove and below
3000 C.P.S. Multiple taps provide a selection of inductance values
which remain constant at any current within the ratings of the chokes.
Application notes and design charts are supplied with each transformer.
t5J1!'3.-..
~""4toQ,(
T-aoceo
Of't.
T-~
D.C.
Application
.2 to 1.5H at 300 M.A.D.C.
.2 to 1.5H at 500 M.A. D.C.
RMS
T est
7500
7500
Res.
30
27
Dimensions
Mounting
Centers
2%
3Ys
2Ys
3}{6
1 oo
2
W.
31~
32~
272
I%;
Weight
(Lbs.)
D.
H.
41:j{2 472
42%2 4Ys
2Y.t: 3l{6
7
9
2
Control
The Thordarson Dual Tone Control was developed to provide an
effective tone compensating network for any sound system. As indicated by the response curves, treble and bass frequencies may be
attenuated or accentuated independently of one another. The system
----r -----1
,.........
,'..!•.• 'I
r--f"!I-.,.....
t"
,',,4.,,\
---~-.u-::.
r,.J " ,
'_.
,
,
I
-t-"ii=~-ll
.,,"' ,',
I
I
I
'
I
t
t
I
:
r- -, '
,
I
3-l~~
~.• =1-:
I
I
I
,
_L• __,
I
<,
~..
t
~
I
~
"
~; : f
;;-
..•.•.•. ,
~#
i
I
I
I
I______
I
1
_
_
I'!' 1'1'11\",0CVCL[!OOp[R5~O[df~DI1oI
IIIIIII
.10 TIIIIII
is applicable wherever
frequencies is desired.
0 oJ
.Ioi
:
CONTROL
HORUAl
-
The Dual Tone Control may be installed between two resistancecoupled stages of an amplifier. It may be mounted on the amplifier
chassis or constructed as a separate unit. Full instructions for assembly and schematic and pictorial diagrams are furnished with the
controls and choke.
I
i~EBLE:>~ON~R~tJ,4
INCREASE
./
V
I,., I 03
II
'j.'
CONTROL
NORMAL
•.•.•.....
SASS CONTRO~
INCREASE
-40
INCREASE
/
./f"lTTIIII
lTn111i
TREBLE
I
...........
CONTROL
1- NORW"L
I ITTIIII
rmlill
TREBLE CONTROL
DECREASE
'\
ES
-40
RAV Case 22H o.D.C. See Page 6 for details.
Dual Tone Control Potentiometers.
TRANSFORMER
.r-'K,,~J~TR:
""
LU.J.l..
••
-3"
$3.25
4.15
11.1
Ti--l-UII
~
CONTROL
~DECREASE
cYCLEfUPEf! ~~C~D
IIIIIII
~O!
1111111
III11II
TREBLE
I 'f I'fliT"
:1
1111111
II11III
TREBLE
20~
T-20C74
R-1068-X
control over a wide range of audio
Operation is based upon degeneration which occurs in the cathode
circuit of a triode tube. The plate loading resistor is made small with
respect to the cathode resistor so that a large part of the voltage
developed by the tube appears in the cathode circuit. Variable frequency response is achieved by the introduction of appropriate values
of inductance and capacity into the grid and cathode circuits, which
in turn increase or reduce the amount of degeneration in various
frequency ranges.
."
BASE
smooth
SPECIALISTS
Prices subject to change wilhout notice.
SINCE
18,95
{P} Uranltormerl
Plate
Thordarson Matched Plate Supplies
Regulation curves and ripple voltages for matched power supplies are shown.
Comparison between ripple voltage of a conventional circuit with a radically swinging choke (5-22 H) and a 12 Henry smoothing choke, and a
circuit using two similar Thordarson Universal Chokes, is shown under curves for T-21P75. These actual measurements show that the regulation
remains the same for either system throughout a greater than normal variation in load current. A decrease in ripple voltage with the "New
Reactors" is clearly illustrated, (See "doUed" curve). This is due to the radically improved design which provides more inductance in the filter
circuit throughout the entire current range.
Refer to page 17 for the Thordarson Variable Power Supply Circuit which may be used to modify any of the circuits shown below.
All plate transformers are rated with both ICAS and CCS values. All units have electrostatic shields between primary and secondary windings.
All units are ideal for Amateur Transmitters, experimental uses, and industrial applications.
Type
No.
T-21P75
Pri. Volts Pri.
VA
SO-60 Cy. ICAS CCS
$135.00 PUV 115-230 1900 1500
List
Price
Mtg.
Fig.
Sec. Volts
A.C. R.M.S.
3000-0-3000
2400-0-2400
1500-0-1500
T-21P77
95.00 PUV
115-230
1250
900
T-21P79
67.50 PUV
115-230
1000
750
T-21P81
57.50 PUV
115*
630
480
1560-0-1560
1265-0-1265
T-21P82
60.00 PUV
115*
820
600
T-21P83
37.00 PUV
115*
440
300
T-21P85
25.SO PUV
115*
370
260
T-21P87
15.00 GGV
115*
250
185
2335-0-2335
1700-0-1700
1560-0-1560
1250-0-1250
855-0-855
730-0-730
835-0-835
656-0-656
3000-0-3000
2450-0-2450
1875-0-1875
1560-0-1560
T-21P89
9.00 GGV
115
135
95
550-0-550
T-21P91
27.00 PUV
115
375
280
1200-0-1200
and
900-0-900
1075-0-1075
and
500-0-500
*Secondary voltage changes by means of primary taps.
T-21P93
15.00 GGV
115
210
160
Volts
D.C.
2500
2000
1250
2500
2000
M.A. D.C.
ICAS
CCS
Mounting
2100
Weight
(Lbs.J
13Yz 9~6
135
D.
W.
12%'6
7%
10
6%
11
9
77
D.
650
500
4%2
425
300
3~
1580
1250
550
400
3J{6
lOYs
5%'6
11
6Ys
60
1250
1000
2000
1500
1250
1000
425
300
3J{6
10Ys
5%'6
11
6Ys
57
300
220
3J{6
lOYs
5%'6
11
6Ys
58
300
200
• 21J{6 7%
41J{6 8Yz
6
33
600
500
650
500
400
425
300
20/16 6%
4J{6 6Ys
53/\'6
19
300
220
3
3VJ6
32%!
4K6
4%
10
250
175
2Yz
21%;
3%;
1000
and
750
1000
and
400
200
150
20/16 6Ys
40/16 3Ys
53/\'6
7%
150
110
110
95
150
125
3
39/16
au
<l'
c
-'
0
2fOO>
Co)
co
2500
TRANSFORMER
H.
W.
T-21P75
2800
Dimensions
SPECIALISTS
Pnces subject to chanz. without MtiC ••
SINCE
1895
4J{6
32%2 4l!16
4%
6Yz
22
10
6
•••5
T-21P79
3
.15
"00
teoo..,
1500'-'
>
IllOO
13000
•••
1'tOO Sf
....
350 ~
0
1100 >
1250 0
T-21 PSl
..•
2tOO:t
2000 ~
C)
1')00".
1800 •••
T-21PS2
co
•••
lIOO c:o
350 •..•
......8
~6
t.••T-21PS3
300~
-;,2
..•.
250'"
0
750
700
650
600
•••
."
~
0
".
c.>
0
..
100 •••
750
~.8
~.6
!J
160'"
0
I
50
l
2S
•••
Sl
....
,.
T-21P87
c •••
..•..
•2
700 ~
oc
T-21 PS9
0
..•
5
0
1200 ~
105O~
llOO~
T-21P91
750 •••
0
(,
...
w
w .8
1000 ~
BOO!;
:: .6•••
;;
SOO~
lIOO<.)
T-21P93
•••. .2
c
TRANSFORMER
SPECIALISTS
Pnces subject to ck nee witkout notice.
SINCE
1895
(R)
UniverJal J(eplacement Power
VranJlormerJ
"22R" Series
These power transformers are designed for both specific duty and for
general replacement service. Adjustable mounting brackets permit flush,
vertical, or horizontal placement. All transformers are RMA color coded
and designed to RMA standards. Replacement recommendations are given
in Thordarson Replacement Encyclopedia. All Primary ratings 117 V.
50/60 cycles.
Secondary No.1
Type
No.
List
Price
Mtg.
Fig.
Prim.
VA
A.C. Volts
T-22ROO
T-22ROl
T-22R02
T-22R04
T-22R05
T-22R06
T-22R07
T-22R08
T-22R09
T-22RI0
T-22Rll
$5.25
5.30
6.75
7.50
8.00
9.50
10.80
5.25
6.25
8.00
9.50
AGF
AGF
AGF
AGF
AGF
AGF
AGF
AGF
AGF
AGF
AGF
45
55
65
80
95
125
165
40
55
90
125
250-0-250
275-0-275
300-0-300
300-0-300
300-0-300
325-0-325
350-0-350
250-0-250
275-0-275
325-0-325
325-0-325
D.C.MA
40
50
70
90
120
150
200
40
50
85
120
Reel.
Fil.
5V -2A
5V -2A
5V -2A
5V-2A
5V-3A
5V-3A
5V-3A
5V-2A
5V-2A
5V-2A
5V -3A
Fil.
No.2
Fil.
No.3
6.3 V CT-2 A
6.3 V CT -2.5 A
6.3 V CT -3A
6.3 V CT-3.5 A
6.3VCT-5A
6.3 V CT-5A
6.3V CT-6A
2.5VCT-4A
2.5VCT-7.5A
2.5 V CT-9 A
2.5 V CT-12.5 A
2.5 V CT -3.5 A
2.5VCT-5A
Mtg.
Centers
Dimensions
W.
D.
2 x2Yz
2 x2Yz
2 x2Yz
2~x21Vt6
2Yz
2Yz
2Yz
3
3
3
21~
2Yzx3Ys
2~x3Ys
3Ys
3Ys
3%
3~
3~
3
2
2
3~
x3~
x2Yz
x2Yz
2Yzx3Ys
2Yzx3Ys
2Yz
2Yz
3Ys
3Ys
H.
Weight
(Lbs.)
IlJ{6
I1Vt6
2Vt6
2K&
1~
2~
2~
3
2Yz
4Yz
3
21Vt6
4~
5~
734,
3
3
IlJ{£
IIVtt
1~
2~
3~
3~
2~
3
3Yz
5Yz
To furnish plate and filament voltage requirements of amplifiers, receivers
and exciter stages of transmitters. All ratings given are for a primary
input of 117 Volts, 50/60 Cycles.
Type
No.
T-22R30
T-22R31
T-22R32
T-22R33
T-22R34
T-22R35
Secondary No.1
List
Price
Mtg.
Fig.
Prim.
VA
A.C. Volts
D.C.MA
Reel.
Fil.
$7.25
7.75
8.75
10.50
13.50
15.00
GGV
GGV
GGV
GGV
GGV
GGV
55
76
107
145
186
290
275-0-275
360-0-360
350-0-350
375-0-375
385-0-385
400-0-400
50
80
110
160
225
340
5V-2A
5V-2A
5V-2A
5V-3A
5V-3A
5V-6A
I
Fil.
No.2
Fil.
No.3
6.3 V CT -2.5 A
6.3 V CT -2.5 A
6.3VCT-3A
6.3VCT-5A
6.3VCT-5A
6.3VCT-7
A
6.3VCT-3A
Dimensions
Mtg.
Centers
W.
2 x2Vt6
2 x21J{6
2Yzx21J{6
3 X3~6
3 X3~6
3 X4J{6
21Ys2
3Vt6
3%!
2%
3%2
32%'2
32%2
32%'2
31J{6
31%;
3:j{2
3Ys
21'H"6
4%
4%
4%
D.
41J{6
5Vt6
H.
Weight
(Lbs.)
3~
4
5~
7~
10
12Yz
POWER (R) TRANSFORMERS
TELEVISION
This unit is ideal for use in high voltage, low current, power supplies.
The transformer is designed for use in oscilloscopes, television receivers
and test equipment. Primary is rated at 117 V. A. C. 60 Cycles. All secondaries are insulated for 7500 V. RMS Test. Instruction sheet packed with
transformer shows regulation curve with a typical filter circuit.
Type
No.
T-22R40
List
Price
$15.00
Secondary No.1
Mtg.
Fig.
Prim.
VA
A.C. Volts
GGV
18
2800
D.C.MA
TRANSFORMER
2
Reel.
Fil.
2.5V-1.8A
SPECIALISTS
Dimensions
Fil.
No.2
Mtg.
Centers
W.
D.
H.
6.3V-.6A
tapped at 2.5V -2.1A
2Yzx2%;
3~
3~
31Vt6
SINCE
1895
Weight
(Lbs.)
4~
The speech filter has been specifically designed for Amateur, Police, Emergency Radio Services and special audio applications. It is a small compact
band pass filter with all components contained in a fully potted case.
The main requirements of these services is signal readability and not "Broadcast" quality. Tests have shown that ideal speech transmission can
be obtained with no noticeable reduction in articulation when a band width from approximately 200 to 3500 C.P.S. is provided.
Electrically this filter has been designed to operate out of a source
impedance of approximately 10,000 ohms, such as a medium mu triode
(6C5, 6J5, triode connected 6J7 etc.) to a 100,000 ohm grid or a 500
ohm line for remote operation. A step-up ratio of 1:3.15 is obtained
when the unit is operated from the primary to the 100,000 ohm secondary. In all applications the input plate circuit must be parallel fed. A
plate blocking condenser will not be necessary as one of the proper
value is incorporated in the filter.
50
60 80
200
400
600 800 1M
2M
4M
6M 8M
FREQUENCY IN CYCLES
0
The T -20C73 speech filter will function satisfactorily at any signal
level up to -8 db which corresponds to a level of 10 volts R.M.S.
across the 100,000 ohm output grid circuit or .69 volts at 500 ohms.
The frequency attenuation
obtained with this band pass filter is
shown. In addition to the applications enumerated above, this unit
will be ideal for use in the audio stages of a communication receiver, as
the speech filter will limit the audio response and thus suppress high
pitched heterodynes and other extraneous signals.
Type
No.
T-20C73
Mtg.
Fig.
List
Price
$16.00
Application
RTV
W.
200 to 3500 Cycle Band Pass Filter
Weight
(Lbs.)
D.
Yz
1% Dia.
Variable D.C. Power Supply Components
The variable power supplies shown in the circuit are ideal for amateur phone and CW transmitters as well as in laboratory applications where a
variable source of D.C. voltage is desired without resorting to expensive methods of primary voltage control.
The circuit constants shown provide three ranges of D.C. variable voltage. A smooth variable control of output voltage is provided by controlling
the amount of phase shift of the Thyratron grid voltage as supplied by phase shift transformer T-22R50. These highly desirable variable power
supplies are designed around standard conventional components.
POWER SUPPLY
EMPLOY,"G
DC OUTPUT
AND
KEY I NG.
SEE
BELOW
'l'AlUES
FOR
HBlE
DC RANGES.
AltO 2501{ TO Ell!~IMATE
Type
No.
List
Price
RECTlf
FOR
OMIT
FOR
I ER GR I 0
C I Reu IT
T3'
KEYIIiG
RY
FEATURE.
Mounting
Mtg.
Fig.
T-22R50
$3.50
BAR
D.C. Voltage and Current
TttVRATROMS
VARIABLE
The circuit as shown is suitable for safe and click free CW transmission. With the elimination of the relay circuit a versatile piece of
laboratory equipment can be constructed. The filter components have
been selected to provide less than 1% ripple throughout the entire
ranges of the supplies. When type 2050 thyratrons are used in the
small power supply a slight circuit change is necessary. The screen of
the thyratron must be connected to the cathode and the cathode to
the center tap of the filament transformer. Phase shift bridge transformer T-22R50 can be employed with other types of thyratron
tubes and circuit applications where phase control is desired. The
secondary insulation is rated at 5000 volts test and sufficient voltage
amplitude is available to provide positive phase control of average
rectified current. When using this transformer in other circuit applications the RC or L values assigned to the phase shift bridge arms
should be such that a maximum secondary current of .03 Amps.
R.M.S. will not be exceeded. Application notes are supplied with each
transformer.
Application
W.
Special Phase Shift Transformer-Pri.
TI
T"
T3
117V.
Dimensions
-------------W.
D.
D.
3Ys
31~6
VI
CHI
2
H.
2%
CI
50- 400 V
200 MA
T-21P89
T-21FlO
T-20C54
2050
8 Mfd.
500-1500 V
500 MA
T-21P79
T-21F02
T-21FI0
T-20C57
TT17 or FG17
4 Mfd.
1500-2500 V
500 MA
T-21P75
T-21F20
T-21FlO
T-20C57
873
4 Mfd.
TRANSFORMER
SPECIALISTS
Prices subject
to change without
notice.
SINCE
1895
Weight
(Lbs.)
1;}4
RI
20 K
50 K
75 K
$electing
Output UranJ!ormerJ
This accurate and convenient table has been compiled to facilitate the choice of the correct output transformer for popular applications. In mo~
instances two transformers are offered, one the universal type which will accommodate a wide range of primary and secondary impedances and
the other a specific duty type designed for that particular application.
Plate
Volts
Screen
Volts
lAS-G, lA5-GT ....................
90
90
-
4.5
4.0
25,000
lC5-O, 1CS-GT ....................
90
45
67.5
90
135
90
45
67.5
90
135
90
135
180
90
135
-
7.5
8.000
-
4.5
6.0
9.0
7.5
- 3.0
- 4.5
- 7.5
- 6.0
-13.5
7.5
1.6
38
5.0
*7.0
4.0
8.0
*19.0
135
-16.5
Tube
ID8-GT ...........................
1E7G (Push-Pull Operation) .........
1F4, 1F5-GT .......................
90
135
180
(P-P CI. AB ,) ....................
IG5-G ............................
IG6-G, IG6-GT ....................
1J5-O .......................
1J6-G (P-P C1. B) ..................
lLA4 ..............................
1LB4 (See lD8-GT) ...............
....
90
90
90
45
67.5
90
IT5-GT ...........................
2A3 (Single CI. A) ..................
(P-P CI. ABI Fixed Bias) ..........
(P-P CI. ABI Self Bias) ...........
2A5 (Single CI. A) ..................
(P-P CI. A Pentode) ..............
(P-P CI. Al Pentode) ...
(P-P CI. AB2 Pentode) ............
(P-P C1. AB! Triode) .............
90
250
300
300
250
250
315
375
350
135
3A4 ...............................
3Q4 ...............................
3Q5 .............................
384 (See lS4)
4A6-G ............................
6A3 (See 2A3)
O.
..
O.
-4.5
90
Plate
Load
M.A.
':.
90
90
45
67.5
67.5
90
..
250
250
285
250
90
T-22S86
T-22S86
T-22S74
7.0
*5.0
4.0
13,500
10,000 C.T.
450
2.100
T-22S86
T-22S74
25.000
6A5-G ............................
. . . . . .. .
25,000
8,000
8,000
5,000
8,000
14,000
2,500
3,000 C.T.
5,000 C.T.
7,000
14,000 C.T.
10,000 C.T.
10,000 C.T.
10,000 C.T.
6.5
60.
*80.
*80.
34.
68.
*62.
*54.
*50.
90
-
7.5
4.5
14.8
9.5
10,000
90
90
-
4.5
9.5
8,000
-
1.5
*1. 1
100
180
250
300
6A4 ...............................
100
180
- 6.5
-12.
-45.
°
O.
250
250
0.
250
.035
.100
.200
.115
9,000
9.
22.
60.
*35.
32.
*5.
....
T-22S86
T-22S86
....
T-22S86
....
....
T-22S86
. .....
90
90
T-22S48
.250
.550
.350
9.5
3.8
7.2
7.4
6.
....
T-22S86
8,500
9,000
12,000 C.T.
- 4.5
- 4.5
- 7.
-7.
-
.115
.240
8.50
8.7
*2.0
3.4
-45.
-62.
-62.
-16.5
-16.5
-24.
-18.5
-36.5
Specific Duty
Trans.
.575
.110
.310
1.250
4.5
-
Universal
Trans.
Watts
Output
20,000
16,000
12,000
24,000 C.T.
20,000
16,000
20,000 C.T.
..
IN6-G ............................
lQS-G, 1Q5-GT ....................
IS4 ...............................
6A6 ...............................
6ACS-G, 6AC5-GT .................
(P-P CI. B) .......
.
6AD7 -G (See 2A5)
6AL6-G ...........................
90
135
90
135
135
Plate
Bias
Volts
.100
.270
.065
.180
.270
.170
3.5
15.
10.
3.1
6.2
10.5
19.
9.
.600
.27
27
....
T-22847
T-22S48
T-22848
T-22S48
T-22S48
T-22S48
T-22S48
T-22848
T-22S47
T-22S47
T-22S48
T-22S48
T-22S47
T-22S48
T-22S48
T-22S48
T-22S47
T-22S47
T-22S47
T-22S47
T-22S48
T-22S86
T-22S86
T-22S86
T-22S86
T-22S86
T-22S62
T-22S74
T-22S74
T-22S87
T-22S74
T-22S74
T-22S74
T-22S74
T-22S86
T-22S74
T-22S64
T-22S64
T-22S64
T-22S47
T-22S47
T-22S86
T-22S47
T-22S60
T-22S72
T-22S70
T-22S47
8,000 C.T.
1.0
T-22S74
T-22S47
11,000
8,000
2.500
8,000 C.T.
.31
1.4
T-22S76
T-22S86
3.2
10.0
T-22S62
T-22S74
T-22S47
T-22S47
T-22S46
7,000
10,000 C.T.
3.7
8.0
T-22S74
T-22S66
T-22S58
T-22S56
6.5
T-22S62
T-22S60
....
T-22S74
T-22S58
T-22S48
-14.
72.
0.
-27.5
36.
7,000
14,000 C.T.
4.0
1.6
11.5
15.
32.
28.
*55.
12,000
10,000
7,600
9,000
12,000 C.T.
0.6
1.1
3.4
4.5
9.8
SINCE
1895
2,500
6B4-G (See 2A3)
6B5 ...............................
6E6 ...............................
6F6, 6F6-G (See 2A5)
6G6-G ............................
6K6-G, 6K6-GT ...................
300
250
..
135
180
250
315
285
135
180
250
250
285
- 6.
-9
-18.
-21.
-25.5
42.
*Zero Plate Current per Tube.
18
TRANSFORMER
SPECIALISTS
I'';Ctl subjecl 10 chtJ"te
"';11",,,, notice.
T-22S74
T-22S74
T-22S87
"0
•
T-22S74
T-22S48
T-22S48
T-22S47
T-22S56
Selecting Output (jran~/ormer~
Tube
6L6, 6L6-G, 6L6-GA . .. , ............
(P-P CI. AI).. . . . . . . . . . .....
(P-P CI. ABI) ....................
(P-P CI. AB.) ....................
(P-P-Par AB.) ...................
6N6-G (See 6B5)
6N7, 6N7-G, 6N7-GT (See 6A6)
6V6 (Single CI. A) ..................
(Single Cl. A) ..................
(P-P Cl. ABI) ..................
(P-P CI. AB,) ..................
6Y6-G ............................
6Y6-G ............................
6Y7-G .............
" .............
6Y7-G ............................
6Z7-G .............................
6Z7-G .. .... - ......................
7A5 ..........................
7B5-LT ..........
7B5-LT.
...................
7C5-LT ...........................
(P-P Cl. AB,) - ................
•••••••••
0
•••
_
10 ................................
1287 ..............................
19 ................................
25L6 ..............................
31 ................................
33 ................................
35A5 ..............................
35L6-GT ..........................
38 ................................
38 ................................
•••
..
Plate
Volts
Screen
Volts
250
270
360
360
360
250
270
270
270
270
-13.
-16.5
-22.5
-22.5
-22.5
75.
*134.
*88.
*88.
*176.
250
315
250
285
135
200
250
225
250
285
135
135
-12.5
-13.
-15.
-19.
-13.5
-14.
45.
34.
70.
70.
58.
6\.
180
250
135
180
110
100
250
250
250
425
Bias
Volts
135
135
135
100
135
135
110
110
135
250
250
250
110
110
110
135
250
250
250
3.6
6.
T-22S74
T-22S87
T-22S74
T-22S74
T-22S87
T-22S74
T-22S58
T-22S56
T-22S64
T-22S66
T-22S45
T-22S60
T-22S74
2.5
4.2
\.5
.35
3.4
-7.
-18.
-12.5
-15.
-40.
-13.5
45.
*35.
18
9.
*5.
- 7.5
-22.5
-13.5
- 7.5
- 7.5
-13.5
-25.
-18.
250
250
250
250
48 ................................
(P-P CI. Al Pentode) ............
49 (P-P Cl. B) ..................
96
125
135
96
100
-19.
-20.
50 (P-P CI. A) .....................
50 L6-GT .........................
450
110
53 ................................
59 (Single Triode) ..................
(Single Pentode) ................
(P-P Cl. B) .....................
300
250
250
400
70L7-GT ..........................
117L7 .............................
110
180
180
180
250
105
117N7 ............................
117
-16.5
-15.
°
-84.
- 7.5
0.
-28.
-18.
O.
- 7.5
-40.5
-40.5
105
0.
-25.
-5.5
117
-
250
4.5
5.5
10.
14.
9,000 C.T.
12,000 C.T.
47 ................................
(P-P Cl. A) .....................
79 ................................
89 ................................
5,000
8,500
10,000 C.T.
8,000 C.T.
2,000
2,600
3.
4.2
40.
9.
32.
0.
7.5
-50.
-68.
-33.
0.
-16.5
-165
71-A ..............................
(P-P Cl. A) .....................
T-22880
T-22S70
T-22S68
T-22S68
T-22S78
O.
95
110
T-22S62
T-22S74
T-22874
T-22S74
C.T.
C.T.
C.T.
C.T.
5.5
8.
95
250
275
250
400
250
6.5
18.5
20.0
25.0
50.0
2,500
5,000
6,600
6,600
3.300
7,000 C.T.
14,000 C.T.
41 ................................
42 .................•..............
....................
43 .........
45 (Single Cl. A) ..
(P-P CI. AB.) ...................
46 (Single CI. A Triode) .............
(P-P Cl. B) .....................
110
Specific Duty
Trani.
3.8
5.3
0.
135
Universal
Trans.
Plate
Load
M.A.
O.
0.
110
100
250
250
250
Watts
Output
Plate
6.
49.
8.
14.5
40
40.
9.
22.
32.
2,500
1,200
7,600
5,000
10,000 C.T.
10,000
13,500
10,000 C.T.
2,000
7,000
7,000
2,500
2,500
13,500
10,000
7,600
34.
7,000
20.
34.
*36.
22.
*6.
31.
*31.
4,500
4.5
10.
\.6
T-22S74
T-22S74
T-22S62
T-22386
T-22S74
T-22S74
T-22S74
T-22S74
.55
2.1
T-22386
T-22374
2.1
.185
.7
\.5
\.5
T-22S86
T-22S86
T-22S86
T-22S62
T-22362
T-22S86
T-22S74
.55
2 5
3.4
3.1
T-22S58
T-22S47
T-22345
T-22S47
T-22S47
T-22S58
T-22S64
T-22S47
T-22S48
T-22S47
T-22S45
T-22S47
T-22S47
T-22S45
T-22S45
T-22S48
T-22S47
T-22S47
T-22S47
T-22S86
T-22S46
T-22S86
T-22S74
6,400
5,800 C.T.
.9
\.6
12.
\.25
20.
T-22S46
T-22S70
T-22847
7,000
14,000 C.T.
2.7
5.4
T-22S74
T-22S74
T-22S47
2.
5.
23
8.2
2.1
10.
\.25
3.
20.
T-22S62
T-22S74
T-22S74
T-22S74
T-22S74
T-22S45
T-22S72
T-22S47
T-22S66
T-22S45
T-22S66
T-22S46
T-22S46
T-22S68
\.8
.79
\.6
5.5
3.4
T-22S86
T-22S74
T-22S74
T-22S74
T-22S45
T-22S46
T-22S47
T-22S58
.85
\.2
T-22S86
T-22S47
T-22S74
T-22S46
3,900
5,000 C.T.
52.
*50.
*\. 3
*55.
49.
*17.5
26.
35.
*13.
1,500
3,000 C.T.
8,000 C.T ..
8,000 C.T.
2,000
8,000 C.T.
5,000
6,000
6,000 C.T.
40.
20.
*20.
*3.8
32.
2,000
4,800
8,000 C.T.
7,000 C.T.
6,750
43.
4,000
5\.
3,000
T-22S74
T-22S74
T-22S74
T-22S86
T-22S74
T-22S47
*Zero Plate Current per Tube.
TRANSFORMER
~,;cts
SPECIALISTS
subj.ct
to
ek.",. w;lhOflI
"otic •.
SINCE
1895
19
Output (5) UranJ!ormerJ
The advanced design found in these units make them satisfactory for more than certain specificapplications. It is for this reason that tube types
are not shown on these two pages, but only the general applications for the primary and secondary impedances provided. If specific information
is desired see pages 18and 19 for the use ofthese units, with tube recommendations. Cores in most units have been adjusted so that the transformers
may be used either single ended or for push-pull operation. Frequency response columns show the difference encountered with unbalanced primary D.C. for single ended applications as compared to balanced D.C. conditions. All transformers are color coded and complete instructions are
supplied with each unit.
Replacement Type
No.
Single and Push Pull Plates to Voice Coil-
Low Level
List
Price
T:22S45--$1:65
T-22S46
T-22S47
T-22S48
T-22S56
T-22S58
T-22S60
Primary
Single Plate to Voice Coil
Single Plate to Voice Coil
Single and Push Pull Plates
1.70
2.25
2.40
3.00
3.00
3.40
to
to
to
to
to
1,500 to
3,000 to
6,000 to
12,000 to
8,000 or
5,000 or
2,500 or
Voice Coil
Voice Coil
Voice Coil
Voice Coil
Voice Coil
Special Duty Output to Line and Voice CoilT-22S64
$6.25
T-22S66
6.25
T-22S68
T-22S70
T-22S72
6.50
7.00
7.00
T-22S78
9.50
GGV
GGV
GGV
GGV
GGV
GGV
Single and
Single and
Single and
Single and
Single and
Single and
Push
Push
Push
Push
Push
Push
Pull
Pull
Pull
Pull
Pull
Pull
Plates
Plates
Plates
Plates
Plates
Plates
to
to
to
to
to
to
Line and
Line and
Line and
Line and
Line and
Line and
Impedances
Ohms
3,000
6,000
12,000 C.T.
25,000 C.T.
10,000 C.T.
7,000 C.T.
4,000 C.T.
High Level
Voice Coil
Voice Coil
Voice Coil
Voice Coil
Voice Coil
Voice Coil
10,000 C.T.
8,000 C.T.
6,500 C.T.
5,000 C.T.
3,000 C.T.
3,300 C.T.
Universal Replacement to Multiple Voice Coil
T-22S74
$5.25
BRR
T-22S62
3.70
BRR
T-22S86
2.75
BAR
T-22S87
3.00
BAR
T-22S88
3.25
BAR
Universal Single or Push Pull Plates to Voice Coil
Pri.-14,000-1O,000-8,000-6,6oo-5,OOO-3,000-2,500
C.T.
Universal Single Plate to Voice Coil
Pri.-4,000-3,000-2,500-2,000-1,500
Universal Single Plate or Push Pull Plates to Voice Coil
Pri.-14,OOO C.T.-8,000 C.T.-3,500-2,OOO
Pri.-14 ..000 C.T.-8,000 C.T.-3,500-2,000
Pri.-14,000 C.T.-8,000 C.T.-3,500-2,000
14,000 to 2,500 C.T.
4,000 to 1,500
14,000 to 2,000
14,000 to 2,000
14,000 to 2,000
Universal and Special Duty to Line
Universal or Push Pull Tubes to Line
Pri.-14,000-12.000-1O,000-8,000-5,000-3,000C.T.
Single or Push Pull Plates-Primary 20,000 C.T.
Single or Push Pull Plates-Primary 20,000 C.T.
(Rum Bucking Coil and Core)
T-22S90
T-22S92
4.50
10.00
FGV
RTV
T-22S80
$4.00
BRR
Single Line to Voice Coil
T-22S82
T-22S83
T-22S84
T-22S85
8.00
5.50
3.90
3.40
BRR
BAR
BAR
BAR
Multiple
Multiple
Multiple
Multiple
20,000 C.T.
20,000 C.T.
Matching-Line or Lines to Voice Coil
Lines to
Lines to
Lines to
Lines to
Voice Coil-Pri.-2,000-1,500-1,000-500
Voice Coil-Pri.-2,OCO-1,500-1,000-500
Voice Coil-Pri.-2,000-1,500-1,000-500
Voice Coil-Pri.-2,000-1,500-1,000-500
500 to
600
2,000 to
2,000 to
2,000 to
2,000 to·
500
500
500
500
The popular Thordarson TRU-FIDELITY LINE has been redesigned and expanded. Consult your copy of the latest 500 catalog for complete
listing.
TRANSFORMER
SPECIALISTS
Prices sub}ert to change without
notice.
SINCE
1895
]E
Output (5) Uran Jlorm erJ
4'=
All units shown may be obtained fully potted or hermetically sealed on special order. Under these conditions items art~ priced in keeping with
the quantity involved.
Replacement
Primary Current
Max. D.C., M.A.
Per Side Unbal.
35
10
50
50
60
Single and Push Pull Plates to Voice Coil -
Secondary
Impedances
Ohms
Audio
Frequency Resp.
Power Bal. D.C.
Unbal. D.C.
Watts
Pri.
Pri.
55
3.2 to 4
3
100-15,000
35
35
3.2 to 4
3.2 to 4
3
3
100-15,000
60-15,000 60-15,000
8
35
3.2 to 4
3.2 to 4-6 to 8
3
60-15,000
60-15,000
60-15,000
60-15,000
45
3.2 to 4-6 to 8
3.2 to 4-6 to 8
60-15,000
60-15,000
60-15,000
60-15,000
60
8
8
8
Core
Center
Leg
Mtg.·Dim.
YzxYz
YzxYz
YzxYz
YzxYz
2
2%
1~
1%
2
2
2
2%
2%
2%
21%
21%
3~
3~
3~
1~
1~
1~
I%,
I%,
I%,
1%
1%
1%
2
2
2
%,x%,
%,x%,
%,x%,
W.
30
30
40
45
50
150
3.2 to 4-6 to 8-15-250-500
3.2 to 4-6 to 8-15-250-500
3.2 to 4-6 to 8-15-250-500
3.2 to 4-6 to 8-15-250-500
3.2 to 4-6 to 8-15-250-500
25
25
25
25
25
50-15,000
60,15-000
50-15,000
50-15,000
50-15,000
50-15,000
60-15,000
60-15,000
3.2 to 4-6 to 8-15-250-500
60
50-15,000
60-15,000
60-15,000
60-15,000
1x
1x
1x
1x
1x
1
1
1
1
1
1~ x lYz
Dimensions
D.
W.
21%
Specia.1 Duty Output to Line and Voice Coil50
50
70
80
90
180
Low Level
H.
D.
Weight
(Lbs.)
Yz
Yz
Yz
Yz
1~
1~
1~
High Level
2 x llJ{6
21h'2
2 x llJ{6
2 x llJ{6
2 x llJ{6
2%
21?12
21J{6 3~2
21J{6 3~2
21J{6 3~
21J{6 3~
2Yz
2Yz
2Yz
2Yz
2Yz
21?12
21h'2
3%!
21J{6 2~2
31VI6
3%
3%
4
2Yz
2%
2Yz
1~
2xl1J{6
2Yz x 2%;
5~
Universal Replacement to Multiple Voice Coil
60
1 to 30
25
50-15,000 100-15,000
1x 1
50
1 to 30
8
60-15,000
%,x%,
21Vt6
3~
2
2
50
10
3.2 to 4-6 to 8
3
60-15,000 100-15,000
YzxYz
2
2%
1~
1%
Yz
50
10
3.2 to 4-6 to 8
6
60-15,000 100-15,000
%x%
2%
2Ys
lYz
1%
%'
50
10
3.2 to 4-6 to 8
8
60-15,000 100,-15000
%,x%,
21%
3~
I%,
2
3%
4
2Yz
2Yt6
2Yz
2%
lVI6x lVI6
22h'2
lYs
2%
2
1
80
f
I
~
I
Universal and Special Duty to Line
25
80
60
500 to 600
10
10
10
10
125-200-500 to 600 C.T.
50-15,000 100-15,000
3
50-15,000
125-200-500 to 600 C.T. +IODB 50-15,000
60-15,000
60-15,000
Matching-Line
3.2 to 4-6 to 8-15
3.2 to 4-6 to 8-15
3.2 to 4-6 to 8-15
3.2 to 4-6 to 8-15
8
25
15
5
50-15,000
50-15,000
50-15,000
50-15,000
1x 1
%,x%,
Spec.
1%
Dia.
Yz
or Lines to Voice Coil
YsxYs
3Ya
1x 1
4
31J{6 2
2%,
2~
2%
YsxYs
3%
3Ya
%,x%,
21%
3~
31J{6 2
I%,
2~
2
lYz
2~
lYz
1
2Ys lYz 1%
3
50-15,000
%'
2%
%x%
For high humidity operation, open coil and core transformers can be protected by means of the Thordarson Tropex Treatment. See page 3 for
price schedule and details.
3.2 to 4-6 to 8-15
TRANSFORMER
SPECIALISTS
Price. subject to change without notice.
SINCE
1895
21
oIutomatic (V) Voltage J(egulatorJ
These special automatic voltage regulators. both intermittent
and continuous duty types, are ideal for the following applications.
Broadcast trammiuers
Laboratory applications
Photographic studios
Broadcast and recordit,g studios, etc.
Thordarson Automatic Voltage Regulators deliver a constant voltage (within
1%) despite line fluctuations from 95 to 130 volts and/or secondary loads from
no load to [uIlload rating. Operation is instantaneous and entirely automatic; after initial connection to the source voltage by means of a line cord. further ad·
justments are unnecessary. Devices which are to be controlled need only be plugged into the unit. Output voltages supplied are 110. 115 and 120 volts. 60 cycles.
Regulation of the units is as shown in the tables attached. Supply frequency of all standard units is 60 cycles and the regulation will not be as specified if units are
used on other frequencies; special units may be obtained upon request. Distortion in the "NEW LINE OF THORDARSON
REGULATORS"
has been dropped
to a minimum consistant with economical design practices. The temperature rise of all units is legs than 55° centigrade above the ambient and a high rate of efficiency of the units has been obtained. A complete technical bulletin is supplied with all regulators.
*The electrical characteristics of Automatic Voltage Regulators are such that the primary of this group of l'Intermittent
Duty" types must also be considered as
intennittent.
±
Intermittent
Duty Photogra.phic or Portable
(V) Regulators
Capacity
PowerFactor Mounting
Secondary VA---------LoadVolts
Watts
W.
D.
115
75 Int. Duty
Handle
115
150 Int. Duty
Handle
Type
List
Mtg.
PrimaryVolts
No.
Price
Fig.
60 Cycles
T-23V30
$50.00
KTF
100-125
T-23V31
60.00
KTF
100-125
Regulation of ±1 % throughout a primary change of from 100 to 125 will be found in this intermittent group.
for portable work - or for use with enlargers.
Continuous Duty Automatic
T-23V06
T-23VOO
T-23VOl
T-23V02
T-23V05
T-23Vl0
50.00
57.50
65.00
90.00
135.00
230.00
KTF
KTF
KTF
KTF
KTF
KTF
T-23V21
T-23V22
T-23V23
T-23V24
10.00
12.00
15.00
20.00
OMV
OMV
OMV
OMV
95-130
95-130
95-130
95-130
94-130
95-130
Autotransformer-Voltage
220-250 (50-60 Cy.)
220-250 (50-60 Cy.)
220-250 (50-60 Cy.)
220-250 (50-60 Cy.)
Isolation
T-23V25
T-23V26
6.3
110-115-120
110-115-120
110-115-120
110-115-120
110-115-120
16.00
32.00
Cont.
Cont.
Cont.
Cont.
Cont.
Cont.
80
150
250
500
Cont.
Cont.
Cont.
Cont.
Cuty
Duty
Duty
Duty
Duty
Duty
115
115
100
250
3:J;2
4
11%
11%
16
19
2
2
2%
3Ys
4
4
4>i
~~POSliGlS
LINE QP£RATION
SHJiT[RCQNTACiS,
LSIGNAL f"R()dPHOTO".
He (H.:N)C IN CIRCUIT,'
aLL OR1,llCROPtf:)o:E
Power Transformer-Pri.
BAV
Power Transformer-Pri.
BAH
Ignition Trans.-Pri.
16
i
6~
8:J;2
7%
17
20
1O>i
2:J;2 11l{6 3%2
2:J;2 11~{6 3%2
3
2%'6 31%
3
3%'6 31?16
3Ys
6Y2
2~
2%
21%'6
3'16
3%
4%
3Ya
3Ya
41l{6
41l{6
5
6>i
1O>i
13
5%
7%
Power Supply
Features
A.C. Line or Portable Battery Operation
Charging Time - 10 to 15 Seconds
A.C. Line Battery Recharge Feature
Light Compact Low Drain Power Transformer
Power Supply Output - 2250 V. D.C.
Storage Condenser Delivers 75 Watt-Sec. Energy
Adaptable Trigger Circuits for 2 or 3 Element Tubes
Cold Cathode Rectifiers employed in a Voltage Doubling Circuit
Send for Bulletin "Photo Flash" for details - 15c.
OY.J
BAV
Lbs.
10
4%
12Ya
12Ya
Adiustment
Cont. Duty
Cont. Duty
2 8AtTERV CKAR(;IN6
3 BATT(RV· VIBRATOR Q?ERAilON
CA\(RA
Weight
4Ys
4Ya
Circuit
~·60CY
H.
5:J;2
6
Handle type construction suitable
Photo-Flash
, 1I7V
D.
4:J;2
5
(V) Transformers
Duty
Duty
Duty
Duty
(V) Transformers-Plug-In
OMV 105-115-125(50-60 Cy.)
PUV 105-115-125(50-60 Cy.)
W.
5:J;2
6:J;2
Voltage (V) Regulators
20
40
100
250
500
1000
Changer
110-125
110-125
110-125
110-125
Dimensions
117V 60 Cy.-Sec. 2250V D.C.-1.5 M.A.-2.5 Vat 1.75A
3%
4
2%
117V 60 Cy. or 4V Vib.-Sec.-ll00V
A.C.-1.5 M.A. D.C.
2%
200V Condenser Discharge-Sec.-15,OOOV Peak
Single Hole
3%
2%
2>i
1%
II
TtIORDARsoN .
71_~~~.7::.
-=1 ~
CROSS REFERENCE
Obsolete and Revised Thordarson Tra·nsformers
A considerable number of repetitions occurred in the 400-FX catalog.
In an effort to pass on all latest developments and the results of a
standardization program Thordarson offers a new 4OO-Gcatalog line.
The cross reference below lists all of the former items and the revised
Former
Type No.
T-9V30
T-9V31
T-9V32
T-9V33
R-1068
T-llF53
T-llF55
T-llF59
T-llF60
T-llF62
T-llF63
T-llF64
T-llM74
T-llM75
T-llM76
T-llM77
T-llM78
T-13ROl
T-13R02
T-13R03
T-13R04
T-13R05
T-13R06
T-13R07
T-13Rll
T-13R12
T-13R13
T-13R14
T-13R15
T-13R16
T-13R19
T-13R20
T-13C26
T-13C27
T-13C28
T-13C29
T-13C30
T-13A34
T-13A35
T-13A36
T-13S37
T-13S38
T-13S39
T-13S40
T-13S41
T-13842
T-13S43
T-14A29
T-14R33
T-14R34
T-14R35
T-14R36
T-14R37
T-14R39
T-14R40
T-14M49
T-14C61
T-14C62
T-14C63
T-14C64
T-14C70
T-14A75
T-14A76
T-14S80
T-14S81
I
l
equivalents. In most cases these equivalents will be electrical and
physical duplications, however, where improved design practice has
made it possible new units may be slightly smaller with the same
standard of Thordarson quality.
Revised
Model No.
Former
Type No.
Revised
Model No.
Former
Type No.
Revised
Model No.
Former
Type No.
Revised
Model No.
Former
Type No.
Revised
Model No.
T-23VOl
T-23V02
T-23V05
T-23VlO
R-1068X
T-21F02
T-21F07
T-21F04
T-21Fll
T-21F16
T-21F06
T-21F19
T-21M61
T-21M61
T-21M62
T-21M64
T-21M65
T-22R08
T-22R09
T-22RlO
T-22Rll
T-22Rll
T-22Rll
T-22Rll
T-22ROl
T-22R02
T-22R04
T-22R05
T-22R06
T-22R07
T-22ROO
T-22R02
T-20C52
T-20C52
T-20C53
T-20C53
T-20C54
T-20A16
T-20A19
T-20A19
T-22S47
T-22S88
T-22S46
T-22S56
T-22S74
T-22S62
T-22S48
T-20A22
T-22R20
T-22R20
T-22R20
T-22R22
T-22R22
T-22R20
T-22R24
T-21M64
T-20C52
T-20C52
T-20C52
T-20C52
T-20C74
T-20A40
T-20A41
T-22S80
T-22S47
T-14S82
T-14S83
T-14S84
T-14S85
T-14A90
T-14A91
T-14A92
T-14D93
T-14A94
T-15ROl
T-15R04
T-15R06
T-15R07
T-15R08
T-15Pll
T-15P12
T-15P13
T-15P14
T-15P15
T-15P16
T-15P17
T-15P18
T-15P19
T-15P20
T-15P21
T-15C30
T-15C31
T-15C32
T-15C36
T-15C37
T-15C38
T-15C39
T-15C41
T-15C45
T-15C46
T-15C47
T-15C48
T-15C50
T-15A66
T-15A67
T-15A68
T-15A71
T-15A72
T-15A73
T-15A74
.T-15A75
T-15D76
T-15D78
T-15D79
T-15D82
T-15D83
T-15D85
T-15D86
T-15S90
T-15S91
T-15S92
T-15S93
T-15S96
T-16C07
T-17COOB
T-17DOl
T-17A02
T-17D03
T-17D04
T-17SlO
T-22S45
T-22S48
T-22S47
T-22S88
T-22S90
T-22S90
T-20A16
T-20D76
T-20A04
T-22R35
T-22R30
T-22R33
T-22R35
T-22R35
T-21P87
T-21P87
T-21P85
T-21P91
T-21P81
T-21P75
T-21P81
T-21P75
T-21P77
T-21P75
T-21P75
T-20C60
T-20C60
T-20C61
T-20C56
T-20C56
T-20C57
T-20C57
T-20C57
T-20C56
T-20C56
T-20C57
T-20C57
T-20C57
T-20A05
T-20A05
T-20A05
T-22S92
T-22S92
T-20A25
T-20A25
T-20A25
T-20D82
T-20D82
T-20D82
T-20D82
T-20D83
T-20D82
T-20D82
T-22S66
T-22S70
T-22S68
T-22S78
T-22S82
T-20C53
T-20C54
T-20D77
T-20A24
T-20D77
T-20D82
T-22S60
T-17S11
T-17S12
T-17S13
T-17S14
T-17S15
T-17S17
T-17S18
T-17R30
T-17R31
T-17R32
T-17R34
T-17R35
T-17R36
T-17R37
T-17R38
T-17A42
T-17S57
T-17M59
T-18VOO
T-18V01
T-18V06
T-18V07
T-18C92
T-19D01
T-19D03
T-19D04
T-18D05
T-19D06
T-19M13
T-19M14
T-19M15
T-19M16
T-19M17
T-19M21
T-19M22
T-19C35
T-19C36
T-19C37
T-19C38
T-19C39
T-19C42
T-19C43
T-19C44
T-19C45
T-19C46
T-19P54
T-19P55
T-19P56
T-19P57
T-19P58
T-19P59
T-19P60
T-22S66
T-22S70
T-22S68
T-22S70
T-22S78
T-22S83
T-22S83
T-22R35
T-22R35
T-22R40
T-22R32
T-22R30
T-22R31
T-22R32
T-22R32
T-20A05
T-22S88
T-21M52
T-23V25
T-23V26
T-23V22
T-23V24
T-20C52
T-20D82
T-20D82
T-20D82
T-20D83
T-20D76
T-21M60
T-21M60
T-21M61
T-21M62
T-21M64
T-21M56
T-21M62
T-20C56
T-20C56
T-20C57
T-20C57
T-20C54
T-20C56
T-20C56
T-20C57
T-20C57
T-20C54
T-21P89
T-21P89
T-21P87
T-21P93
T-21P91
T-21P83
T-21P82 or
T-21P83
T-21P82
T-21P82
T-21P81
T-21P79
T-21P82
T-21P79
T-21P77
T-21P77
T-21P83
T-21P93
T-21P83
T-21F02
T-19F80
T-19F81
T-19F83
T-19F84
T-19F85
T-19F86
T-19F87
T-19F88
T-19F89
T-19F90
T-19F91
T-19F92
T-19F93
T-19F94
T-19F95
T-19F96
T-19F97
T-19F98
T-19F99
T-26V04
T-29C27
T-29A99
T-33A91
T-33S99
T-37C36
T-43C92
T-44C02
T-47C07
T-47A25
T-49C91
T-50R03
T-50Vll
T-50F61
T-52C98
T-53C19
T-53S81
T-54D63
T-55A16
T-56R02
T-56R03
T-56R05
T-57SOl
T-57S02
T-57A36
T-57A38
T-57A39
T-57A40
T-57A41
T-57A42
T-57C51
T-57C52
T-57C53
T-57C54
T-58A37
T-58A70
T-58S72
T-60S48
T-60R49
T-61S25
T-61S26
T-61F85
T-61A94
T-63R63
T-63F99
T-21F08
T-21FlO
T-21F04
T-21F06
T-21F06
T-21F07
T-21F19
T-21FOO
T-21FOl
T-21F02
T-21F04
T-21F06
T-21F15
T-21F16
T-21F18
T-21F19
T-21FlO
T-21Fll
T-21F12
T-23V21
T-20C50
T-20A22
T-20A22
T-22S56
T-20C50
T-20C53
T-20C53
T-20C53
T-20A22
T-20C54
T-22R10
T-23V23
T-21FOO
T-20C50
T-20C54
T-22S80
T-20D75
T-20A02
T-22RI0
T-22R10
T-22Rll
T-22S88
T-22S88
T-20A23
T-20A23
T-20A23
T-20A22
T-20A23
T-20A22
T-20C53
T-20C53
T-20C54
T-20C54
T-20A01
T-20A24
T-22S72
T-22S83
T-22R08
T-22S76
T-22S76
T-21F14
T-20A02
T-22R10
T-21F03
T-64F14
T-64M26
T-64F33
T-64F38
T-65A73
T-65S94
T-67C46
T-67D47
T-67S48
T-67C49
T-67D50
T-67S51
T-67S52
T-67S54
T-67M69
T-67M73
T-67M74
T-67D78
T-67A91
T-68C07
T-68C08
T-69R35
T-70R20
T-70R61
T-70R62
T-70R78
T-70A83
T-72A59
T-73M52
T-73F60
T-74F23
T-74F24
T-74C29
T-74C30
T-74A31
T-74D32
T-75R47
T-75C49
T-75C51
T-75A74
T-75S75
T-78D46
T-81S01
T-81C15
T-8lD42
T-8lD52
T-82M25
T-83D21
T-83M22
T-83A78
T-83S87
T-84S58
T-84D59
T-84P60
T-84M70
T-86A02
T-86A03
T-87R85
T-89S68
T-89S74
T-89S75
T-92F20
T-92R21
T-93C20
T-21F19
T-21M61
T-21F02
T-21F19
T-20AOl
T-22S66
T-20C50
T-20D76
T-22S66
T-20C55
T-20D77
T-22S64
T-22S68
T-22S70
T-21M50
T-21M60
T-21M60
T-20D77
T-20A24
T-20C53
T-20C52
T-22R34
T-22ROl
T-22R31
T-22R33
T-22R30
T-20AOl
T-20A03
T-21M66
T-21Fll
T-21F06
T-21F07
T-20C54
T-20C51
T-20A23
T-20D77
T-22R05
T-20C54
T-20C56
T-20A17
T-22S64
T-20D75
T-22S56
T-20C58
T-20D77
T-20D77
T-21M65
T-20D83
T-21M66
T-20A04
T-22S78
T-22S78
T-20D78
T-21P89
T-21M62
T-20A04
T-20A22
T-22R33
T-22S78
T-22S60
T-22S68
T-21F16
T-22R34
T-20C50
SINCE
1895
TRANSFORMER
T-19P61
T-19P62
T-19P63
T-19P64
T-19P65
;.r -19P66
T-19P67
T-19P68
T-19P69
T-19P70
T-19P71
T-19F75
SPECIALISTS
vru-9iJelitg
by Thordarsont
Majors
Bias 8upply Components
Filters
High'Level Modulation Transformers
Plate Transformers
Line Equalizers
High Level ModulatioILReactors
Auto Transformers
tConsult your latest 500 Catalog for all Broadcast iteI1lS"'
Thordarson Inchers
Thordarson Bantams
Multi-Shield Bantams
Incher Series
T-5A1
T-5A2
T-5A7
T-6A1
Case Style R-l. 1~6" dia., 1Ys" high and weight 174;oz.
Max. Operating Level 0 db (6 milliwatts)
Frequency Response :1% db from 30 to 15,000 C.P:S.
Mic., Line or Pick-up to Grid
5O/2OO*/5OO*-Pri.
Mic., Line or Pick-up to pop Grids
5O/2OO*/5OO*-Pri.
Single Plate to poP Grids
10K to'15K-Pri.
Push-Pull Plates to Line
10K to 15K C:r.-Pri.
T-1A50
T -1 A53
T-1A60
T-1A51
Case Style R-2. 1%" dia., 2~6' high and weight 7 oz.
One Piece Drawn High Permeability Alloy Case.
Max. Operating Level + 10 db. Balanced (humbucking) Coil Construction.
Frequency Response: 1 db from 30 to 15,000 C.P.S.
Mic., Line or Pick-up to Grid
50/125/2OO*/250/333/5OO*-Pri. 5OK-Sec.
Mic., Line or Pick-up to poP Grids
50/125/200*/250/333/5OO*-Pri.. SOXC.T.-Sec.
Single Plate to poP Grids
10K to 15K-Pri.
SOKC~X...:see.
Push-Pull Plates to Line
10K to 15K C.T.-Pri.
50/125/200*/
5OK-Sec.
SOK-Sec.
95K-8ec.
5O/2OQl/5OO*-S~c.
Bantam Series
Multi-Shield Bantam Ser~es
Case Style R-3. 11~6' dia., 274;"high and weight 8 oz.
Multiple High Permeability Magnetic Shields. Balanced (humbucking) Coil Construction.
Max. Operating Level +10 db. Frequency Response :1 db. from 30 to 15,000 C.P.S.
Low Impedance, Mixer, Pick-up or
50/125/200*/250/333/5OO*-Pri. 50K-Sec.
to Single Grid Multiple Line
Low Impedance, Mixer, Pick-up or
50/125/200*/250/333/5OO*-P,ri.
to poP Grids Multiple Line
Single Plate to pop Grids
10K to 15K-Pri.
poP Low Level Plates to Line
10K to 15K C.T.-Pri.
T-1A7D
T-1A73
T-1A81
T-1A78
High Operating Level.
Frequency Response :%
,~" ..,
if
TYP~ N.o.
I
Mtg:
'.
,·~,"";~"""t~:::"t'::"· -P-ri-m-ar-y-----S-e-c-on-(j-a-ry-'
T-2A67
R-4 5'OO*f~25/2OO~/50
T-2A35 " R-4 .!OK/2500
T-3A31
R-4' "20K/5..K
T-3S21-A R-5 1250/5000*/750/3000*
T-3S22-A PUV 1250/5000*/750/3000*
T-'3S23
db from 30 to 15,000 C.P.S.
Ohms Impedance
PUV 2500*/1500* Pop Par.
2A3, 6B4, 6L6's etc.
*Indicates balanced center tap.
**Indicates MA per side.
--
per Side
100K*/25K poP Grids
100
4OK*/1OKpop Grids
o
500*/125/200*/50
10
1.25/5*/3.75/15*
60
50/200*/125/500*/1.25/
60
5*/3.75/10/7.5/15*
62.5/250*/125/500*/1.25/
84
5*/7.5/10/3.75/15*
62.5/250*/125/500*/1.25/
140
5*/1,25/5*/7.5/10/3.75/15*
ELECTRIC
W.
D.
w.
2Ys
2Ys
2Ys
1%,
l%,
2Ys
2Ys
2Ys
1%
2%
2Y8Dia.
2Y8Dill..
2Y8Dill..
374;Dill..
3Ys
3~
2~
6Ys
4Ys
2~6
5Y8
4Ys '
MFG~
CYHaguire c!JnJu'sl.ries c!Jnc.
500 W. HURON STREET
CHICAGO
10. ILLINO)
,
• U. S. A.
1 OR ~RSON
ELECTRIC
MANUFACTURING
DIVISION
~d~
INCORPORATED
500 WES'r HURON STREET
'nlrough the use ot Thordarson !'l1ltl-I1'1tch
and Unlversal Ibdulatlon transtonners
It IS
posslble to match any class B plate to plate
load trom 2000 to 20,000 ohmllto any class C
load ot trom 3000 to 15,000 ohmll. The CHT
J'4ultl-~tch types have plug-ln-Jack term1nals
to enable the user to qulckly obtaln the
correct turns ratl0.
• CHICAGO 1', IlliNOIS,
care snould be taken that the D.C. secondary current does not exceed the maxlmumratIng of the transformer.
A parallel connscted
secondary wl11 carry twlce the current of a
ssrlea connectlon, and !n the event that the
class C current 1s greater than the allo"*tble
current or the serles cormectlon, a parallel
connectlon must be used.
U.S.A.
serlous d1stortlon
w1l1 result.
With •.•
plate to plate load sl1ghtly lower than nor··
mal, the efflc1ency lS somewhatreduced tor
however, for speech the
a glv~n output;
plate dlss1pa.;1on 1s below nonJlil and thEI
sllght de~rea~e in eft1clency wlll In no way
cauee the plata dlss1patlon to be l'xcee<1ed.
A'f NO TIl'£
SHOULD THE CLASS B
KlDULATORfi
WITHOUT
A LOAD. It CWoperatlon
Wheneverthe exactratl0
cannot be secured BE OPERATED
the next lower ratl0
Should be used. Th1s Is deslred With a transmitter wh1ch normally
1ncorporates a modulator, the secomary of
reflects
a lower value of plate to plate
load, across whlch the modulator power Is the modulat1on transformer must be shorted.
more eas11y developed.
It a plate to plate
In order to determlne the correct transtonner connectlons It IS tlrst
necessary to load h1gher ·than normal IS used, max1mum For speech operat1on the average modulator
know the class C load and the plate to plate audl0 power cannot be developed, and If the plate current ls approx1mately one-halt the
load to >tIlch 1t Is to be matched. From gr1ds are dr1ven harder so that the class B slne W8vevalue speclt1ed by the tube IIl&lIU"
tacturer.
to the normal value,
Increases
may be de~ current
these two values the turns ratl0
termlned by means ot the curve (Fig. 1) and
connectlons trom
t1 nally the transtonnar
Flg. 2.
The use ot the curve 111
as tollows: Extend
a vertlcal 11ne trom the 'Class B Plate to
Plate Load" 11ne to the curve shown tor the
correct
class C load.
A horlzontal
11ne
drawn trom thls polnt to the ordlnate ot the
curve marked "Turns Ratl0 Prlmary to Secondary" glves the correct
turns ratl0.
The
actual
transtormer
connectlons
tor thlS
turns ratl0 may be found trom Flg. 2.
3.0
2.9
2.~
2,7
2.
~
To match a 10,000 o'un class B
plate to plate load to a 5000 ohm class C
load.
r--
To determlne the c"orrect ratlo:
Drawa
l1ne vertlcally
trom "10,000 ohmll" at the
bottom ot the chart to polnt "0' whlch Is
ot the 10,000 ohm11ne and
ths Intersectlon
the class C curve marked "5000 ohms". Draw
a horlzontal
11ne trom thls
polnt to the
'Turns Ratlo'
11M on the left.
The turns
ratl0 ot the modulatlon transformer from the
total Pr1J11Srl to the secondary Is shownas
1.41 to 1. Thenearest lower ratl0 avallable
on the transtormer
(Flg. 2) Is 1.4. Thls
one should be used.
The correct
connectlons to secure thls
ratlo, as shown In·Flg. 2, are as follows:
Connect the modulator plates
to term1nals
No. 2 and No.5.
Joln term11lll1s No.:3 and
No. 4 and connect to the modulator plate
supply. For the secon:1ary Joln tennlnsl
No. 7 to termlnal No. 11.
Also connect
terml1lll1 No. 8 to termtnal No. 12and connect
the class C load to terminal Mo. 7 and
termllllll No.8.
Whenthe class C load is an odd value not
covered by one of the curves 1t may be Interpolated between two of the curves.
To detenntne the correct ratlo:
Drawa
11ne vertlcally from 6800 ohmllon the "P).atllj
to Plate Load" 11ne toa polnt midW8Y
between
the 5000 and the 6000 ohm class C curves.
The correct ratl0
ls 1.12 and the nearest
lower ratio shown 1n F1g. 2 ls 10m!; whlch
IS the one >tIlch Should be used for thls
connectlon.
Slnce only part of the wln:11ngls used for
some comblnatlons, the 1lIlX1_ allowable
value of plate to plate load 1s necessarlly
llm1ted. Thls max1J1R111l
value 1s shown In the
last column of the table and should not be
exceeded.
2.4
2.3
00
2.2
I
0 •••_ ••••
TurnlI Ra1010
Prlary
to
BecoJl1at'J
3.14
8econary
Berles
.
a.
Plete
2
Plate
3-4
I
Join
Together
·c·
2.68
7
2.8
2.61
2.6
1
7
1
3-4
9-10
2.5
1
3-4
2.32
7
9-10
12
2.07
1-.8
1.73
7
7
1
9-10
8-11
3-4
12
12
6
1.61
8
9-10
11
.~
12
6
12
6
8-9
10-11
2-3
4-6
8-11
-tl
9-10
2-5
6
1.00
7
8-11
12
1.59
1.57
1.49
1.44
1.4
7
2·
9-10
12
5
3-4
2--6
"...,
6
11
9-10
8-12
6
6
l2·
6
8-11
9-10
3-4
7-12
8-11
1-6
1
3-4
2-5
9-10
2-6
7
8-11
12
2-3
1.32
1.<:>$
1
6
1.25
1.25
.15
loll
1
1
1.1
5
1.02
.967
1
2
3-4
3-4
6
5
8-9
.868
.8
.77
1
·f
6
12
6
9-10
3-4
7-12
1-6
1
3-4
8-11
2-5
.742
.714
2
8
3-4
9-10
5
11
9-10
.7
.639
.se8
.675
.556.
.495
.483
.458
.455
.385
.357
2
8
1
2
1
8
2
8
1
1
8
3-4
9-10
2-5
3-4
2-5
9-10
3-4
9-10
2-6
2-5
9-10·
5
11
6
5
6
11
5
11
6
6
11
8-11
3-4
9-10
8-9
8-11
2-3
9-10
3-4
9-9
9-10
3-4
3-4
!ltg.
rill:.
No.
T-21M60
T-21M81
T-21M62
T-21M64
T-21!'!65
KTV
PIIV
PUV
PUV
PUV
Primary If.A.
Each Side
50
126
210
250
320
SecoJl1ary If.A.
Berles
Parallel
50
100
125
250
160
320
500
250
320
640
:r-211'l60
T-211f81
T-211'!62
Type
No.
T-2l115O
T-21Jf)2
T-211'l54
T-211'l56
T-211'tXl
!'Itg.
rill:.
BAll
rav
OOV
OOV
KTV
Prlmry
AllDl1catlon
1-19 etc.
6N7 etc.
P-P 6L6 etc.
TZ2-809 etc.
811-812 etc.
frL
1,600
3,000
3,000
Audl~
Power
15
60
125
300
500
2-1/16
1-3/4
2-3/16
2-11116
3-1/16
I
TeI"lll1
na1 Board 8tamped
Tel"lll1nals 1 - 2
Termlmls 1 - 3
Terminals 1 - 4
Audio
Power
3
10
25
75
100
20000 0ImJB
7-10
20000 OhmB
1tlWO UflIIB
20000 UhmB
-
eooo OhmS
1•••
16000 0!lIIlII
7-11
8-12
7-6
20000 OhmB
1<:W0 uhmB
20000 0l1mlI
16000 I1mll
12000 OhmS
2-3
4-5
2•••
20000 0h118
eooo Olllllll
7-8
20000
1 oo
20000
1 oo
OhmS
OhmS
0hIIs .
Ohllls
7-9
10-12
7-10
16000
16000
20000
12000
Ohllls
Ohms
0hIII8
Ohms
7-9
10-12
7-10
20000 0hIII8
16000 OhmB
1 OO OhmB
1-3
4-6
1-4
-
-
12000 0hIII8
8000 Ohms
-
l.2OOOOhmB
BOOOohmB
1 oo 0hIII8
12000 OhmB
1 oo OhmS
oo Ohms
12000 OhmS
oo 0l1mlI
1 oo OhmB
luooo Ohms
eooo 0l1mlI
DIlD!lnalons
D.
2-1/2
4-58
8-1/8
8-7/8
10
Prt.
10,000
10,000
Bec.
Power
.03A-135V
.0BA-35OV
.lA"'OOV
.2A-l250V
.2A-l250V
20000 0hmB
1•••
1-2
!'!ountllUl'
W.
7-8
-
7-12
2-5
8-12
7-12
7-12.
1-6
7-12
2-6
7-12
7-12
1-6
1,600
3,000
3,000
II!Jt)e<tance
Becondary
Primary
10000 C.T. 4500
10000 C.T. 4500-3750-3000
6 600 C.T. 4000
10000 C.T. 6600-3750
15000 C.T. 6250
olms ohmBolms ollllB -
7-9
10-12
-
8-12
~
Primary
Brown Blue - Red C.T•
Brown Blue - Red C.T.
Prt.
500
Bee. 6000
6000
'7000
20000 OhmB
20000 OhmB
1 OO OhmB
7-11
8-12
1-6
2-6
7-12
Type
ts-IU
1-6
82-6
3-4
3-4
9-10
ts-l/
10-11
7-11
8-12
1-3
4-6
1-5
1-3
4-6
l~
lI-IU
Bo,11
3-4
16000 OhmS
2-G
li:
7
2
12000 0'-
-
2•••
2-5
1,.6
2-3
9-10
3-4
3-4
<;onnec"
Class ·C·
Load To
8-10
Join
Together
6
8-11
P'Il.xIIllWll
A110WlLble
Plate to
Plate Load
Para1 e
connect
Cllaes
Load To
W.
D.
2-15/16
3-118
4-1/16
4-11/16
5-5 16
3-11/16
5-1/4
8-5/8
7-3/4
11
H.
4
4
5-3/16
6
6-7/8
Weight
Lbs
3-3/4
8-3/4
18-3/4
20
65
Bec.
10,000
10,000
!'!ountlnll:
W;
D.
2
2-3/8
2
2 x 1-11 6
2-1 2 x 2-15/11
3-1/2 x 4-1/16
I'
W.
2-3/8
2-7/16
2-9/16
3-3/16
4-9/16
Dimensions
D.
1-3/8
2-1/16
2-15/16
4-3/16
5-11/16
Secondary
Black
Green
Bleck + Yellow 3000 ohlllll
- Red
3750 ohms
Blue
4500 ohlllll
Bleck
oreen
Black + Yellow 3750 ohlll! at
- Red
6600 ohlle at
Bec.
H.
1-3/8
2-3/16
3-1/8
3-7/8
5-5/8
.2 A
.15 A
8000 ohlllll - Terminals 1 - 6
9000 Oh1118
- Tormlnals 1 - 6
1 oo oh1118
- Tel"lll1nala 1 - 7
WOlght
LbR.
1/2
1-1/4
2-3/4
8-3/4
13
The unique design of Thordarson Unversal Modulation Transformers
offers a large number of impedance ratios will but few taps. The primaries and
secondaries are interchap~eable,
i.e., the plmary can be used as the secondary
and the secondary as the primary.
•
The table on the reverse side sho~ various comblnations wnich can be
obtaj .ed. Column 1 lists plate' .)plate loa( impedances from 2000 to 16,000 ohms.
Colun..!2 indicates the terminals used.
Termhals indicated under "I''' and "I''' connect to the plates of the modulator tubes.
~erminals indica'ted under "B" and "B"
are joined together and connected to the "B" plus supply. ,Trg~remaining columns
indica te the various secondary j oads availa'b:
e.
.-
To use the t&ble, .first -<ietermine tie r"c(iunel.lu.~Q plate to pIa e load
for the modulator tubes, then the secondary ~)ad imloJduilce. Lay a straight e:,ge
or ruler across the sheet froin the figures r.)resenting the secondary load to .-h Jse
showing primary load impedance.
The figures to the right of the primary impedu~ce
will indicate primary connections.
Figures ,t the top of the page, directly'above.
the secondary load, will indicate secondary <onnections.
,
,
Example 1 - A pair of type 825 tubes are to 1e used to modulate another pair of
type 825 tubes.
Two of these tubes in ClassB with a plate to plate load of 8000
ohms will 100% modulate an input of 165 watt~. The maximum modulated D.C. plate
voltage of 825's is 750 and the maximum D.C. t-:'.ate
current per tube is 110 m.a.;,
82 watts of audio power will 100% modulate th, fill) ':'m:t of '750 volts at 220 m.a.
The load impedance will be 750 or approximateLY 3400 uhms.
The table shows the
.220
nearest maxch to be 3120 ohms, with a modulator plct~ t) plate load of 8000 ohms.
Connections will be as follows:
Modulator tU\..plb,teo I~erminals #7 and #12; terrrinals #8 and #,11 are joined for the "B" plus .",'lecti
••:;> for the secondary connections we join terminals #1 and #3, and ter, !'"ls #4 f-1nd #6; liB" plus connects
~r "BI pI us can be connec ted to
to terminal #1 and the R. F. load to terminal f,
terminal #4 and the R. F. load to terminal #1. - I
If the exact plate to plate load cannot be fo ld, 1. t,hct' -'>:,L
column, or if the'
:)1 .aI:'j
:.~C!,' . ;: "not be found,
the
plate to plate load is shown, but the exact's
";"",,,,",~4"n("O-o_"":.2.=ro~
n., .•..•
_"ho
..,C\+C1 .•..•
"Y';~;:I
!:Ie
f"1"'l11r'l''1v'''''".-,...
_
_
Example 2 - Using two type 6L6 tubes, Class j,B, to a 6000 ohm R.F. load, the reCommended plate to plate load is 3800 ohms, so the impedance ratio is 3800 or
.634:1.
6000
fhe nearest plate to plate impedance listed iti 4000 ohms. Using 4000 ohms, the Class
"c" load will be 4000 6320 ohrlJ.s.The nearest secondary load to 6320 ohms is 6240 ohms .
• 634
This results
=
in a mis-match
of only l!%.
Examtle 3 - Using four type 6L6 tubes in pus! ,-pull parallel, Class AB, with a plate
Since 120 watts of audio power
to p ate load of 1900 ohms for an'output of 120 watts.
will 100% JIlodulate an input of 240 watts, a <,uitable Class "c" load would be 1200 volts
at 200 m.a., or a load of 1200 ~ 6000 ohms. - Choose a primary plate to plate load of
.200
fOOO, this being the nearest listed to the dEsired 1900 ohms.
The secondary load
which should be used for a perfect match is :;000 x 6000 or 6320 ohms.
The nearest
1900
listed impedance to 6320 ohms is 6200 ohms, and in order to get a perfect match for the
modulator tubes the Class C current should be changed in the ratio of 6200 or the Class
6300
C current for perfect matching will be 6200 A 200 or 196 m.a.
6300
T-19M14'
T-19M15
T-19M16
T-19Ml7
,"..
Max.Audio
Watts
30
60
100
250
Max.P-~i ::M.A. Max.Sec.N.1l.. Max.Dec.M.A.
Each Side
Series
,Parallel
75
75
150
125
125
250
175
175
350
?,25
225
450
THO'~O~·~~R~NES
Guarante~ Not Valid if Transformer is
operated without Secondary load.
This Transform!!:r is adequately
in.sulated to with~
stand any voltage encounhred
during normal opf:ration.
If $f:condary load i$ rf:mond abnormal voltagu will df:·
vf:lop bf:twf:f:n tf:rminab and $f:rious damagf: may rf:$ult.
.,~~::~~:'~~.
1/flmCind .. Pl'WJ; 6,! IIzl'tdCi'U,l'n"
~J<!_:
-
TtiORDARSON
1
SEOONDARf CONNECTIONS
SfRIES COILS
CLASS "E"
PLATE TO
PrATE WAD
ffiJMARY
9-10
JOIN - - - - 9-10
CONNECTIONS JOIN - - - - - - - - - - 8-12
P B-B P CO~
CLASS ~ 7-12
Ite" WAD TO .
13400
5800
1 2-5 6
3700
8650
2 3-4 5
8 9-10 11
20100
8700
1 2-5 6
13000
5550
2 3-4 5
8 9-10 11
11500
1 2 5 6
17300
7400
2 3-4 5
8 9-10 11
9250
21650
2 3 4 5
__
66.60
2850~
1 3-4 6
8 9-10 11
11100
2 3-4 5
8000
3420
1 3-4 6
8 9-10 11
7 8-11 12
9300
1 3-4 6
399
7 9-10 12
7 8-11 12
l0600
1 3-4 6
4560
7 9-10 12
~\\
7 8-11 12
r
1 3-4 6
119QO
5130~
7 9-10 12
7 8-11 12
1 3-4 6
13320
5700
7 9-10 12
?
8-11 12
1 3-4 6
16000
6840
7 8-11 12
7 9-10.12
1 3-4 6
18600
7980
7 9-10 12
7 8-11 12
21200
1 3-4 6
9120
7 9-10 12
8-9
3-4
7-12
1-6
'~r"'"
2000
2000
2000
3000
3000
3000
@1.®
..
4000
4000
5000
5000
5000
6000
6000
6000
6000
7000
7000
7000
8000
8000
80'00
9000
9000
9000
10000
10000
10000
12000
;1.2000
12000
14000
14000
14000
16000
16000
9700
6200
-----pARALLEL COILS
3-4
2-6
15500 ~
4BOQ
9600
14400
19200
2-5
12350
16440
4900
7320
9800
.lGG~u
7-9
-10-12
7-10
8-12
7-8,
~
3380
2180
1620
1030
5100
3270
2430
1550
6760
436,0
~
2060
9360
5760
4860
5320
10920
3185
6680
2730
5670
16.25
3370
6080
12480
3640
7600
3120
6480
1860
3840
6840
14040
4095
8580
3510
7290
2090
4330
7600
15600
4550
9560
3900
8100
2320
4820
18720
! 9120
11520
5460
9720
4680
5800
2780
I
10640
21840
6370
13360
5460
11340
3250
6740
I
12160
7280
I
9600
15360
I
62.40
3720
->--
5450
2580
164..0
10-..;.
6540
20iO
~680:
@
8220
-20570-
I
18600
5760
13440
1-6
3-4
I
115800
14500 "
9300 I
23700
19500
12400
11520
2-3
60
2480
2880
3280
4080
4520
4960
~
3100
l-Q
4-6
1-4
4000
6000
8000'
--,
••.' •••
.luuV·J
12000
2340
1292
2730
1464
3120
1658
3510
1852
3900
4680
2240
2584
5460
29~a

COMPLETE TRANSFORMER CATALOG No. 400G 1947

Transcription

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