Thumb Bass 5 Owners - Preamp Replacement

All hail the Glorious Peoples Revolutionary Thumb Bass Cadre!

I have an 89 Thumb 5 NT with EMG J pickups and the preamp is getting sick. Too much treble - I have to choke the darn treble pot to keep from hissing and cutting off heads with piercing high end. Here's some background information about the bass that may or may not be relevant to your calculus:

Pickups: stock Warwick for 88-89
Current Control Layout: 3 knobs front to back - 1 volume-pull passive, 2 blend with center detent, 3 stacked bass and treble (inner).
Strings: DR High Beams round wound, Medium 5 45-65-85-105-125
Playing Styles: mostly popping and slapping, touch bass, harmonics - but also loud metal and quieter jazz and folk accompaniment
Amps: GK 200MB, 400RB+SWR Goliath Jr, MB500/GK Neo 410, Sans Amp Bass DI

So... Replacement pre amp suggestions?



PS - tengo tres cabezas - una de cabra, uno de bagre, y uno hombre feo.

 

That's a good suggestion, Pickles. Thanks. I will pop the hood tomorrow and give it a once over and see if cleaning pots and contacts helps.