MA 6100

MA 6100
PREAMP AMPLIFIER
SERVICE INFORMATION
STARTING
LABORATORY
INC.
2
S E R I A L NO.
CHAMBERS
STREET
AE1001
BINGHAMTON,
NEW Y O R K
MA 6100
MclNTOSH
WITH
MA 6 1 0 0
P E R F O R M A N C E LIMITS
PERFORMANCE
Mclntosh audio power ratings are in accordance
with the Federal Trade Commission Regulation of
November 4, 1974 concerning power output claims
for amplifiers used in home entertainment products.
POWER OUTPUT
70 watts minimum sine wave continuous
average power output, per channel,
both channels operating into 8 ohms
load impedance which is:
23.7 volts RMS across 8 ohms
40 watts minimum sine wave continuous
average power output, per channel,
both channels operating into 16 ohms
load impedance which is:
25.3 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
8 ohms or 16 ohms
RATED POWER BAND
20 Hz to 20,000 Hz
RATINGS
OUTPUT VOLTAGE
At TAPE output: Aux, Tape, Tuner: 300 mV with
input
Phono: 300 mV with rated input;
1.2 volts with 1.0 mV input at 1000
Hz
Tape Hd: 300 mV at 500 Hz with
rated input
DAMPING FACTOR
50 at 8 ohms output
100 at 16 ohms output
INPUT SENSITIVITY AND IMPEDANCE
Power Amplifier: 3 volts, 100,000 ohms
Phono 1 and Phono 2: 2.5 mV at 1000 Hz, 47,000
ohms
Tape Head: 3 mV, 47,000 ohms
Tape, Aux, and Tuner: 300 mV, 250,000 ohms
BASS CONTROLS
+ 16 dB to -16 dB at 20 Hz
TREBLE CONTROLS
+ 16 dB to -16 dB at 20,000 Hz
LF FILTER
Active filter, 12 dB per octave rolloff below 50 Hz;
20 dB down at 20 Hz
TOTAL HARMONIC DISTORTION
HF FILTER
Active filter, 12 dB per octave rolloff above 7000 Hz;
20 dB down at 20,000 Hz
0.2% maximum harmonic distortion at
any power level from 250 milliwatts to
rated power per channel from 20 Hz to
20,000 Hz, both channels operating
GENERAL INFORMATION
SEMICONDUCTOR COMPLEMENT
36 Silicon Transitors, 22 Silicon Rectifiers and Diodes, 2 Silicon Bilateral Switches, 2 Triac
INTERMODULATION DISTORTION
0.2% if instantaneous peak power output is twice
rated continuous average power or less per channel
with both channels operating for any combination of
frequencies 20 Hz to 20,000 Hz
FREQUENCY RESPONSE
20 Hz to 20,000 Hz +0 -0.5 dB at rated power
NOISE AND HUM
Power amplifier: 95 dB below rated output
Aux, Tape, Tuner: 90 dB below rated output
Phono Input, Tape Hd.: 76 dB below 10 mV input
POWER REQUIREMENTS
120 Volts, 50/60 Hz, 50 watts at zero signal output,
380 watts at rated output
MECHANICAL INFORMATION
SIZE
Front panel measures 16 inches wide (40.64 cm) by
5 7/16 inches high (13.81 cm). Chassis measures
15 inches wide (38.1 cm) by 13 inches deep (33.02
cm), including Panloc shelf and back panel connectors. Knob clearance required is 1½ (3.81 cm) in
front of mounting panel
WEIGHT
34 pounds (15.42 kg) net, 46 pounds (20.87 kg) in
shipping carton
MA6100 BLOCK DIAGRAM
MA 6 1 0 0
TONE & VOLUME
CONTROL
NOTE
LEFT CHANNEL
PREAMP PC BOARD 044-512
MA 6 1 0 0
PC B O A R D 0 4 4 - 5 1 4
10
RIGHT CHANNEL
PREAMP PC BOARD 044-512
EQUALIZATION PC BOARD 044-420
PREAMP SECTION
MA 6100
154-632
MA 6 1 0 0
MA 6 1 0 0
POWER OUTPUT
SECTION
MA6IOO
154-631
MA 6 1 0 0
LEFT CHANNEL
POWER OUTPUT
PC BOARD 0 4 4 - 4 8 0
RIGHT CHANNEL
POWER OUTPUT
PC BOARD 0 4 4 - 4 8 0
MA 6 1 0 0
REG & PHASE INVERTER PC B O A R D 0 4 4 - 4 1 9
Q417
Q415
TOP
BOTTOM
Q418
Q416
LOCATION OF TRANSISTORS NOT ON PC BOARD
TOP
BOTTOM
MA 6100
POWER SUPPLY
SECTION
MA6IOO
154-616
MA
6100
SCHEMATIC NOTES
1. U n l e s s otherwise s p e c i f i e d : R e s i s t a n c e values are in ohms , 1/4 w a t t ,
and 10% tolerance; Capacitance v a l u e s smaller then 1 are in microfarads
(µF); capacitance v a l u e s greater than 1 are in picofarads (pF);
inductors are in m i c r o h e n r i e s ( µH) .
2.
Printed c i r c u i t board components are o u t l i n e d on the schematics by
dotted l i n e s . The c i r c l e d numbers around the dotted l i n e s correspond
to the numbers on the PC Board layouts.
3 . The heavy l i n e s on the schematics denote the p r i m a r y s i g n a l p a t h .
4. The t e r m i n a l n u m b e r i n g of rotary switches is for reference o n l y .
5 . A l l voltages indicated on the schematics are measured under the
fol1ow ing c o n d i t i o n s :
a.
Use of an 11 megohm i n p u t impedance VTVM.
b. A l l v o l t a g e s ±10% w i t h respect to c h a s s i s ground.
c.
No s i g n a l at i n p u t t e r m i n a l s .
d.
AC i n p u t at 120 v o l t s , 50/60 Hz.
e.
Front panel controls a t :
Volume
F u l 1 y CW
Tape mon.
out
Tape copy
out
I n p u t selector
Aux
Mode selector
Stereo
B a l a n c e control
Zero
Phase
out
Como
Flat
Speakers
out
Filters
out
6.
Tone
controls
Flat
In u n i t s w i t h S e r i a l No's below A E 1 4 5 3 ; C415 & C416 are 1000pF.
C413 & C414 are 1000µF and C407 & C408 are 470pF.
7.
In e a r l y export u n i t s R429, R430, R447 & R448 are 47
8.
In u n i t s w i t h S e r i a l No's below AE2557; C I 1 7 and C 1 1 8 are 1 2 p F .
9.
In u n i t s w i t h S e r i a l No's below AE2075; R309 is D308.
Part No. 070-064)
10.
(Mclntosh
In u n i t s w i t h S e r i a l No's below A E 2 1 2 2 ; R211 & R 2 1 2 are Mclntosh
Part No. 134-354 and R227 & R228 are M c l n t o s h Part No. 134-253.
1 1 . I n u n i t s w i t h Serial No's below AE3988; R 4 2 1 , R422, R423 & R 4 2 4
are 100 5% 1/2W; R425, R426, R427, & R428 are used; D 4 1 7 ,
D 4 1 8 , D419 & D420 are not used; R437 and R438 are used and D 4 I 5
and D 4 1 6 are not used.
MA
REPLACEMENT PARTS
A l l p a r t s not l i s t e d are common
a b l e from r a d i o p a r t s j o b b e r s .
items obtain-
R e p l a c e m e n t p a r t s may be o b t a i n e d when ordered
by PART NUMBER f r o m :
Mclntosh Laboratory,
Inc.
C us tomer S e r v i c e D e p a r t m e n t
2 Chambers S t r e e t
Binghamton, New Y o r k 1 3 9 0 3
( telephone 6 0 7 - 7 2 3 - 3 5 1 2 )
CAPACITORS
Symbol
Number
Part
Number
Description
C 1 0 1 , 102
Mylar
C105, 106
. 47µF
D417,418
Si. Rectifier
070-046
D419,420
Si.
Rectifier
070-046
0308
Si.
Rectifier
070-031
D309
Zener
D401 , 4 0 2
Si.
Rectifier
070-047
D403,404
Si.
Rectifier
070-046
D405,406
Si.
Rectifier
070-047
D407,408
Si.
Rectifier
070-047
D409,410
Si.
Rectifier
070-031
D411 , 4 1 2
Si.
Rectifier
070-031
20V
070-064
250V
064-069
D413,414
Ge. PNP T r a n s i s t o r
132-098
Ta. E l e c t 10µF
63V
066-221
D415,416
Si.
070-047
C107,108
T a . E l e c t 10µF
63V
066-178
C111 , 112
Mylar
250V
064-069
F401 , 4 0 2
Fuse
5A
089-014
C113, 114
T a . Elect- 100µF
16V
066-226
F403,404
Fuse
5A
089-014
C115,116
Mylar
064-067
CB301
C i r c u i t B reaker
C119, 120
Mylar
. 22 µF
250V
064-068
C123, 124
Ta. E l e c t
100µF
16V
066-226
C125,126
Mylar
.22µF
250V
064-068
C127, 128
Mylar
C 1 2 9 , 130
Mylar
.022µF
C I 3 1 ,132
Mylar
C137,138
. 4µF
. 1 µF
. 1 µF
Rectifier
FUSES
4A
088-007
CHOKES
L401,402
Choke
4µH
122-105
TRANSISTORS
064-067
Q 1 0 1 , 102
S i . PNP t r a n s i s t o r
132-096
250V
064-102
Q 1 0 3 , 104
S i . PNP t r a n s i s t o r
132-096
.01µF
250V
064-040
Q 1 0 5 , 106
S i . NPN t r a n s i s t o r
132-095
Mylar
.47µF
250V
064-069
Q 1 0 7 , 108
S i . NPN t r a n s i s t o r
132-093
C201 ,202
Mylar
.22µF
250V
064-068
QI09, 110
S i . NPN t r a n s i s t o r
132-093
C209.210
Mylar
.01µF
250V
064-040
Ql11 ,112
S i . NPN t r a n s i s t o r
132-093
C212 ,213
Mylar
.022µF
250V
064-102
Ql13, 114
S i . NPN t r a n s i s t o r
132-095
C301
Mylar
. 47µF
250V
064-069
Q115, 116
S i . NPN t r a n s i s tor
132-095
C302
Ta. Elect
10µF
63V
066-221
Q301
S I . NPN t rans i s tor
132-094
C303
Elect.
33µF
40V
066-204
Q302
S i . PNP t r a n s i s t o r
132-096
C305
Mylar
.22µF
064-096
Q303
S i . NPN t r a n s i s t o r
132-078
C306
Mylar
1µF
250V
064-088
Q 4 0 1 ,402
S i . PNP t r a n s i s t o r
132-056
C307
Elect.
100µF
40V
066-206
Q403 ,404
S i . PNP t r a n s i s t o r
132-056
C312
Elect .
066-191
Q405,406
S i . NPN t rans i s t o r
132-081
C313,314
Elect.
Q407,408
S i . NPN t r a n s i s t o r
132-021
S i . PNP t rans i s t o r
Elect.
Q409,410
132-032
C317
C 4 0 1 ,402
Q411 , 4 1 2
S i . NPN t r a n s i s t o r
132-080
Q413, 414
Si . PNP t r a n s i s t o r
132-079
Q415,416
S i . NPN t rans i s t o r
132-128
Q417, 4 1 8
S i . NPN t r a n s i s t o r
132-128
80/150/150/200µF
200/200/150/100V
9300µF
50V
066-162
220µF
100V
066-201
Elect.
150µF
63V
066-?05
C403,404
Elect.
470µF
4V
066-136
C419,420
Elect.
10µF
35V
066-173
C427,428
Ta. Elect 1 . 5 µ F
20V
066-158
POTENTIOMETERS
DIODES
D301 ,302
S i . R e c t i f i er
070-041
D303,304
S i . R e c t i f ier
070-041
D305,306
S i . R e c t i fier
070-031
D307
Zener
75V
070-025
R20I
Ba l ance con t ro l
134-240
R2IO
Vo 1 ume cont ro l
134-239
R21 1
B a s s t r i m con t ro l
134-354
R212
Bass t r i m control
134-254
6100
POTENTIOMETERS
R215
Treble control
134-238
R2I6
Bass control
134-237
R227
Treble t r i m control
134-253
R228
Treble trim control
134-253
RESISTORS
R3I3
Wirewound 600
5W
139-043
R314
Wirewound 1 . 5K
5W
139-079
R401 ,402
Wirewound 3 . 6K
1 0W
139-047
R433,434
Wirewound . 33
5W
139-080
R435,436
Wirewound .33
5W
139-080
SWITCHES
SI
Input selector switch
146-153
S2
Pushbutton s w i t c h
150-01 1
S3
Mode selector switch
146-134
TRANSFORMERS
T30I
Power t rans former
044-418
THYRISTORS & TRIGGERS
SBS401 ,402 B i l a t e r a l s w i t c h
131 -004
Triac
131-005
TR401 ,402
FRONT PANEL & T R I M
Front panel
044-423
F ron t pane l end caps
018-154
B a l a n c e control knob
044-375
Comp
090-100
cont ro l knob
Bass knob ( f ron t )
044-375
Bass knob ( rea r )
090-100
T r e b l e knob ( f r o n t )
044-375
Treb le knob ( rear )
090- 100
Vo l u me con t ro l knob
044-372
Mode selector knob
044-372
I n p u t selector knob
044-372
LAMPS
Pane l i l l urn i na t i on # 1 866
058-014
S w i t c h i n d i c a t o r #51
058-021
M O U N T I N G SYSTEM
She l f bracket ( r i g h t )
043-622
S h e l f bracket ( l e f t )
043-623
Mount i ng temp l a te # 1 00
038-179
Hardwa re package
043-608
M I S C E L L A N E O U S ITEMS
P l a s t i c feet
01 7-156
Sh i pp i ng ca r ton
044-510
Owners manua l
038-61 1
L i ne cord
170-021
M A 6100 S C H E M A T I C P A R T N O . 0 3 8 - 8 1 0
BE042004
20C1025S7-M4810