Modifying tone controls for bass guitar

[andythefat]

Apologies if this has come up before, I built a THCustom Effects tube driver V1.2, and would like to lower treble and bass controls by maybe an octave. The treble in particular just adds noise, rather than shaping my sound. I recognise the Baxandall tone circuit, but don't know which cap values to alter, and to what...

Much appreciated!

[Aleph Null]

Capacitors 28–31 are the components to experiment with. Since larger capacitors will create a lower cut-off frequency, doubling those values is a good place to start. I'd recommend socketing the capacitors and experimenting, though. I don't have any personal experience with the tube driver, so I can't say with certainty what will sound best. Also, you may find that what sounds best to you are different values entirely.