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Adjustable bias guitar amp heads2/25/2023 Cathode Bias amplifiers (also commonly referred to as self-biasing)Įach of these types is unique. Adjustable Fixed Bias amplifiers (adjustment potentiometer to set the "fixed" bias point).Non-Adjustable Fixed Bias amplifiers (no bias adjustment potentiometer).The bias methods of amplifiers fall into three basic categories: Many tube amp owners are unaware of this simple regular service for their amp that will keep it sounding its absolute best. Some amps do this automatically, but many do not - particularly in the world of guitar amps. Just like the idle of your car may need adjusting when a major change is done to the engine, new power tubes need their idle (the "bias") adjusted to make sure the amp sounds as good as possible. Clearance - Bargains - Scratch and Dent.
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