Hohner B2A problem?

[Axtman]

I have a Hohner B2A headless bass. I find that when I switch to active mode then turn the bass/treble all the way up that it distorts.

Does anyone else have this model and do they have the same problem?

Thanks!

[Stealth]

If it distorts all the way up, two things are possible:

A) The battery's gone sour and needs replacing
B) The operational amplifier (the one chip on the circuit) or some other part has gone bad and needs replacing.