docTCT Family Instruction - Bartolini Pickups and Electronics
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TCT Family Instruction - Bartolini Pickups and Electronics
TCT Family PICKUPS AND ELECTRONICS Vintage 3-Band Preamp/Tone control The TCT Family of tone control preamps has Bass, Mid, and Treble controls with very low noise and wide adjustment range. The sound is extremely clear with low distortion. Bass and Treble bands can be boosted or cut. The Mid band can be narrow notch cut only. An MCT mid boost module can be added for full boost and cut of the mid. The TCT family of preamps are powered by a 9 Volt battery which provides 8-12 months of use. Do not use more than 9 Volts – damage may occur. The TCT Family has 3 models distinguished by their mid cut frequency. Model Bass Mid Treble Input Impedance Output Impedance Power 320KΩ 320KΩ 320KΩ 60KΩ 60KΩ 60KΩ 650uA@9V 650uA@9V 650uA@9V TCT +/-12dB@50Hz -16dB@300Hz +/-13dB@6KHz NTCT +/-12dB@50Hz -16dB@400Hz +/-13dB@6KHz XTCT +/-12dB@50Hz -16dB@500Hz +/-13dB@6KHz TCT Output Boost EQ Controls Input Battery + Ground NTCT green brown white green yellow blue yellow red black XTCT green brown grey green yellow blue yellow red black green brown orange green yellow blue yellow red black Vol Boost Output Neck Pickup Cable EQ Controls Bridge Pickup Cable Ground Battery + Input This diagram shows a basic setup with Mid Cut control in the electronics cavity. This is a popular setup for Jazz bass with the Mid fully or partially cut. The Mid trimmer, battery clip, resistors, and capacitor are included with your preamp. 25KΩ Audio green + 10uF - 10KΩ Fixed Gain Blend 18KΩ (Add this Resistor for 3dB more Gain) Dual 250KΩ 5A5C Treble 500KΩ Audio Mid Cut Only 25KΩ trimmer Bass 500KΩ Audio ground The negative side of the battery should be connected to the jack ring so that power is turned on only when the plug is in. Unplug the instrument when not in use to conserve your battery. Ensure bridge and cavity shields are connected to ground. R150619.1 TCT Family PICKUPS AND ELECTRONICS Vintage 3-Band Preamp/Tone control The TCT Family main modules can be mixed and matched with MCT mid boost modules for different mid boost frequencies. The MCT modules provide additional treble boost as well. Model Mid Boost Treble Boost Wire Colors MCT-250 MCT-375 MCT-500 MCT-3MC +14dB@250Hz +14dB@375Hz +14dB@500Hz Switchable +14dB@250Hz, 500Hz, or 750Hz +6dB@2KHz-15KHz +6dB@2KHz-15KHz +6dB@2KHz-15KHz +6dB@2KHz-15KHz brown + purple brown + black brown + grey See diagram pg.3 Vol Boost Output Neck Pickup black Cable EQ Controls Bridge Pickup Cable Ground Battery + Input This diagram shows the wiring for an instrument with 2 pickups to have Volume, Pickup Blend, Bass, Mid, and Treble controls with an MCT Mid Boost Module. This same diagram can be used for TCT, NTCT, or XTCT with any single frequency Mid Boost Module: MCT-250, MCT-375, or MCT-500. The 50KΩ linear taper Mid pot has 47KΩ and 27KΩ fixed resistors for correct biasing of the EQ circuit. 25KΩ Audio green green MCT Blend Dual 250KΩ 5A5C 47K 27K Treble Mid Bass 500KΩ Audio 50KΩ Linear 500KΩ Audio ground black For additional gain from low output pickups or for blend isolation for improved clarity, a dual buffer like DB918.2 can be added to the input. to battery red Neck Pickup Cable Bridge Pickup Cable DB918.2 black Blend Ganged 25KΩ MN A 25K MN Taper blend is ideal. A 250K blend can be used, but may be noisier. Note that MN and AC tapers are wired in reverse. TCT Family PICKUPS AND ELECTRONICS Wiring Options black Bridge Pickup Cable Bass B/T Stacked 500KΩ Audio Neck Pickup Cable to mid Treble green Stacked Bass/Treble Vol 250KΩ AUDIO 50KΩ Trimmer 27KΩ Blend Ganged 250KΩ 5A5C green Active/Passive Wiring for 2 Pickups with Blend control and Master Volume 47KΩ to bass green MCT In-Cavity Mid Boost/Cut Vol 10KΩ Trimmer Treble Boost Adjust to bass 250KΩ AUDIO yellow Neck Pickup Cable Bridge Pickup Cable Vol 250KΩ AUDIO on-on-on switch 750Hz 500Hz 250Hz Mid 50KΩ Linear 27K 47K Active/Passive Wiring for 2 Volumes Neck Pickup Cable MCT-3MC Vol brown Stacked 250KΩ Audio Mid Switch wiring for MCT-3MC Ground – Connect to cavity shield if available. Also ensure bridge is connected to ground. Stacked Volume/Volume for 2 pickups Bridge Pickup Cable
