Tube Amps / Music Electronics
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|6/16/2000 2:37 PM|
||variable bias? what's that and how to make?|
someone recently advised me to replace the bias inside my vintage MARS tube amp (24 yrs old) with a variable bias...
Is that easy to make? what are the pros and cons?
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|6/16/2000 2:58 PM|
Basically you would be replacing a fixed resistor in the bias supply with a potentiometer to adjust the negative voltage to your power tube grids. This is just an easier way to service the amp when retubing.
There is no performance increase........ just convenience :>)
Look at the transition in some fender blackface amps from fixed resistor to potentiometer. that should get you steered in the right direction.
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