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Shock Brother's DIY Amps Building or modding your amp? Then use this forum to discuss the process and show your pride and joy.

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Old March 31st, 2009, 09:49 PM   #1 (permalink)
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Moving Bias Adjust Pot

Move Bias Adjust Pot?

Would anyone happen to know if moving the bias pot on my amp would make a sonic difference?

This amp has the pot located inside the chassis soldered to the terminal strip.
It's really a pain to take the chassis out every time I try out a different set of power tubes or a different rectifier.

Not to forget, I don't like being anywhere near the open, exposed voltages inside—even though I use gloves and the usual precautions.

I would like to remove the pot from the strip and mount it so it's accessible through a hole in the chassis—like on a Deluxe reverb.

Thanks, John

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Old April 1st, 2009, 03:33 AM   #2 (permalink)
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Shouldn't affect sound/noise at all if you're careful with where you route the wires.

You can drill the chassis and install meter plugs/jacks on the outside as well.

Only trouble is, when you bias it changes your plate voltages slightly, which in turn requires more slight rebiasing to get things right. You're always going to have to check bias AND plate voltages and adjust again.
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3 Gibsons, 5 Teles, assorted other guitars, about a dozen amps, about two dozen pedals, a Smith & Wesson SW40VE, & a .40 SIG Sauer P226R = too many toys, no money, carpal tunnel, and a serious hearing problem.
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Old April 1st, 2009, 10:16 AM   #3 (permalink)
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Thanks Johnny
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