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Is boosting an amp like turning up the bias?

asdfdsa

Member
Messages
232
Is running a boost pedal in front of amp (increase gain/power/signal) similar to increasing the power bias? since in effect they are both raising the power to the power tubes.
 

kevinhifi

Member
Messages
3,430
Hotter bias will push the power section harder and get clipping/harmonic distortion out of your power tubes at lower volumes.

Putting a boost in front of the amp will push the preamp section harder and get clipping/harmonic distortion out of your preamp tubes.

The popular trick is to get a vintage or vintage-inspired amp to the point of just starting to break up (on old Fenders, that's usually a combination of preamp and power section starting to overdrive) and THEN hit it with a booster up front. That way you end up pushing both the preamp tubes and power tubes a little further into distortion, which is a nice sound.
 
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