Tube Driver

[tchewtch]

I have a Butler Tube Driver, it's the cheaper 3 pot model. The Drive pot needs to be replaced but I'm not sure if it's a linear or audio taper pot. The carbon track is breaking up, so it's difficult to measure the resistance at various rotational positions. Anybody know which type I should buy to replace this pot?

A second question concerns the mods to this pedal suggested in the schematics section of this website. It mentions to remove a zener diode, there is no mention to replace with a plain link, so should it be left open circuit?

Thanks for any help you can provide me.

Dave.

[Enzo]

Hi, welcome.

Links? What schematic?


If you can get some resistance at halfway up, that should be enough to determine the taper close enough.

[tchewtch]

Sorry, I linked to this forum from Guitar Effects Pedals, Schematics, Stompboxes & Electronic Projects, I thought it was their forum. I'll try and attach the schematic. Ibelieve I've determined that the pot is an audio taper.

[Jazz P Bass]

T don't know, it says right on the print 'delete the 3.2V zener diode as it's not needed'.

A jumper is out of the question.

[DrGonz78]

That pot looks like a 500k Audio taper. The volume is 100k Audio and there is the tone pot 10k linear. The A stands for Audio, B stands for Linear.