vintage 3-band preamp/tone controlpickups and electronics the tct family of tone control preamps has...
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PICKUPS AND ELECTRONICS
The TCT Family of tone control preamps has Bass, Mid, and Treble controls with very low noise andwide adjustment range. The sound is extremely clear with low distortion. Bass and Treble bandscan be boosted or cut. The Mid band can be narrow notch cut only. An MCT mid boost modulecan be added for full boost and cut of the mid. The TCT family of preamps are powered by a 9 Voltbattery which provides 8-12 months of use. Do not use more than 9 Volts – damage may occur.
Vintage 3-Band Preamp/Tone control
TCT Family
The negative side of the battery should be connected to the jack ring so that power is turned ononly when the plug is in. Unplug the instrument when not in use to conserve your battery. Ensurebridge and cavity shields are connected to ground.
Model Bass Mid Treble Input Impedance Output Impedance Power
TCT +/-12dB@50Hz -16dB@300Hz +/-13dB@6KHz 320KΩ 60KΩ 650uA@9V
NTCT +/-12dB@50Hz -16dB@400Hz +/-13dB@6KHz 320KΩ 60KΩ 650uA@9V
XTCT +/-12dB@50Hz -16dB@500Hz +/-13dB@6KHz 320KΩ 60KΩ 650uA@9V
The TCT Family has 3 models distinguished by their mid cut frequency.
Battery +Ground
Input
BoostOutput
EQ Controls
redblack
yellow
yellow
browngreen
greenwhite
blue
redblack
yellow
yellow
browngreen
greengrey
blue
redblack
yellow
yellow
browngreen
greenorange
blue
TCT NTCT XTCT
This diagram shows a basic setup with Mid Cut control in the electronics cavity. This is a popularsetup for Jazz bass with the Mid fully or partially cut. The Mid trimmer, battery clip, resistors, andcapacitor are included with your preamp.
Mid
25KΩ
Treble500KΩAudio
Bass500KΩAudio
BlendDual
250KΩ5A5C
BridgePickupCable
NeckPickupCable
green
Vol25KΩAudioB
atte
ry +
Gro
un
d
Inp
ut
Bo
ost
Ou
tpu
t
EQ C
on
tro
ls
Cut Onlytrimmer
10KΩ+ -
10uF
Fixed Gain
(Add this Resistor for 3dB more
Gain)
18KΩ
ground
R150619.1
PICKUPS AND ELECTRONICS
MCT
The TCT Family main modules can be mixed and matched with MCT mid boost modules fordifferent mid boost frequencies. The MCT modules provide additional treble boost as well.
Vintage 3-Band Preamp/Tone control
TCT Family
Model Mid Boost Treble Boost Wire Colors
MCT-250 +14dB@250Hz +6dB@2KHz-15KHz brown + purple
MCT-375 +14dB@375Hz +6dB@2KHz-15KHz brown + black
MCT-500 +14dB@500Hz +6dB@2KHz-15KHz brown + grey
MCT-3MC Switchable +14dB@250Hz, 500Hz, or 750Hz +6dB@2KHz-15KHz See diagram pg.3
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 forTCT, 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 EQcircuit.
Treble500KΩAudio
Bass500KΩAudio
BlendDual
250KΩ5A5C
BridgePickupCable
NeckPickupCable
green
Vol25KΩAudio
green
black
Bat
tery
+G
rou
nd
Inp
ut
Bo
ost
Ou
tpu
t
EQ C
on
tro
ls
Mid50KΩLinear
black
47K 27K
ground
For additional gain from low output pickups or for blend isolation for improved clarity, a dualbuffer like DB918.2 can be added to the input.
BlendGanged
25KΩMN
blackDB918.2
NeckPickupCable
BridgePickupCable
to battery red
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.
PICKUPS AND ELECTRONICS
27KΩ
47KΩ
MCT
Mid50KΩLinear
MCT-3MC VolStacked 250KΩAudio
B/TStacked 500KΩAudio
BlendGanged 250KΩ5A5C
Vol250KΩAUDIO
Active/Passive Wiring for 2 Pickups withBlend control and Master Volume
TCT Family
blackBridgePickupCable
NeckPickupCable
green
green
Stacked Bass/Treble
Bass
NeckPickupCable
BridgePickupCable
Vol250KΩAUDIO
Vol250KΩAUDIO
Active/Passive Wiring for 2 Volumes
In-Cavity Mid Boost/Cut
Mid Switch wiring for MCT-3MC
yello
w
Treble
Wiring Options
brown
750Hz500Hz250Hz
NeckPickupCable
BridgePickupCable
Stacked Volume/Volume for 2 pickupsGround – Connect to cavity shield if available. Also ensure bridge is connected to ground.
to mid
47K
to basson-on-on
switch
27K
10KΩ TrimmerTreble Boost Adjust
to bass green
50KΩ Trimmer
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