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Bartolini TCT Wiring


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i got a problem with my Les Paul Special Bass, made 1994 with the barto TCT-Preamp.

It´s made for treble, middle and bass sound control.

But my bass has got only 4 pots. (Volume, PU- Balance, Treble-Boost, Bass-Boost.

There is no Trim- Pot within the electronics case. The wiring diagrams from the barto-site don't show exactly the wiring my bass has. Where is my middle control?


But there is a little black cube installed, the middle-boost-module, i guess.

There are two wires coming out of that, one (brown leads to the preamp module) and the other red one is solded to the ground.

Could this be right?

Please help.


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