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FDP Forum / Miscellaneous and Non-Fender Topics / BK Butler Tube Driver with Bias mod.



Aug 7th, 2017 12:37 PM   Edit   Profile  


What is the best tube to put into a new BK Butler Tube Driver with the bias mod? I'm looking for a smoother tone, not raspy or real fuzzy...



Contributing Member

Too Near Atlanta GA

Amp Tech Emeritus
Aug 7th, 2017 02:32 PM   Edit   Profile  

You might try a 12AU7...




Why do I keep fixing things that work?
Aug 8th, 2017 09:56 AM   Edit   Profile  

I was thinking that the 12AU7 might be a good choice also but was also thinking that a 12AT7 might also be considered for its lower gain while maintaining a good voltage to the circuit components. I think it would still give him some hair and not go too dark in tone.
It is nice to be able to change out tubes on a distortion pedal whereas most of the time we are stuck with whatever sound a certain pedal produces.
So in my thinking, a 12AU7 would be the greatest reduction to the circuit and all other 12A- family members would offer different shades of gain.
That's gotta be a cool but fun pedal to own.
Not to second guess Willie's suggestions, EVER, but was wondering if the 12AT7 might be a good choice also.
Best regards, Always!

FDP Forum / Miscellaneous and Non-Fender Topics / BK Butler Tube Driver with Bias mod.

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