3 Band TCT Preamp, 4 Pots, 1 toggle – TCT-4.7

4 Pots, 1 toggle: (Volume) (Blend) (Mid) [Mid Toggle] (Treble/Bass Stack) > TCT-4.7 - Active or TCT-4.7AP - Active/Passive

List Price:


 how to buy

TCT is the legendary original Bartolini on-board preamp. It has Bass, Mid, and Treble controls with very low noise and wide adjustment range. It has vintage FMV (Fender/Marshall/Vox) frequency controls so each band affects the others and if all bands are set to minimum, the output is muted. The TCT preamp has a voice of its own, providing vintage color to your sound. It has an mid frequency notch at 300Hz for legendary slap tone. TCT is the original Bartolini preamp with inter-dependent controls, so it is a tone shaping preamp rather than a strict EQ and requires expertise.
A professionally pre-wired and fully pre-tested harness saves the time and aggravation of wiring your preamp and pots into your instrument. Wired with our pro-level preamp and premium audio-quality pots and switches, you’ll have smooth control and be ready for years of rugged use. We include battery clips and an output jack for quick installation. All the pots are grounded with a wire that can be connected to the cavity shield or simply cut away if not needed in your installation. Everything is pre-soldered with pro-quality pure copper wire that is double tin plated and protected with semi-rigid insulation so it won’t flop around in the cavity or degrade over time. We use only professional lead-free solder with non-corrosive flux. Knobs are a personal choice, so they are not included with the harness – except where there is a stacked (concentric) pot, we include a ring knob and center knob since they are not as common.

Ordering Details

Model UPC Price
TCT-4.7 682384505069 $340
TCT 3 Band EQ, 4 Pots, 1 toggle: (Volume) (Blend) (Mid) [250,500,750Hz Mid Toggle] (Treble/Bass Stack)
TCT-4.7AP 682384505052 $350
TCT 3 Band EQ, 4 Pots, 1 toggle: (Volume with Pull-Bypass Switch) (Blend) (Mid) [250,500,750Hz Mid Toggle] (Treble/Bass Stack)

TCT-4.7- Technical Details

Preamp Module Size:
1.76" [44.7mm] Long,
1.02" [25.9mm] Wide,
0.54" [13.7mm] Thick
Mid Boost Module Size:
1.05" [26.7mm] Long,
0.79" [20.1mm] Wide,
0.43" [10.9mm] Thick
Operating Voltage:
9V - Prewired battery clip.
3dB - Average boost is preset. Additional boost can be added by an experienced guitar tech. See the wiring diagram for more info.

Bass Control

  • Boost or cut your low frequencies. The control is assymetric and somewhat affects treble response as well.
  • Bass: +/-12dB@50Hz

Mid Control

  • Thicken or thin your tone with mid control. TCT has native mid cut for classic slap tone. Flip the toggle to set the mid frequency boost to 250Hz, 500Hz, or quickly flip to 750Hz for a solo.
  • Mid: +16dB@250/500/750Hz, -11dB@300Hz

Treble Control

  • The TCT provides ample control range for treble boost or cut. The control affects bass response as well.
  • Treble: +/-13dB@6KHz