![]() This creates a slight positive charge on the cathodes. In a cathode-biased amp, the grids are grounded through a grid return resistor and a resistor is placed between the cathodes and ground. In a fixed bias amp, a constant negative voltage is injected to the grids of the output tubes while the cathode is grounded to the chassis. “There are two common ways of biasing the output tubes - either fixed-bias or cathode-bias. In order to explain it both clearly and succinctly, I’m going to pull a quote directly from Gerald Weber’s wonderful tome, Tube Amp Talk for the Guitarist and Tech. This type of bias circuit is a little different than the one we’ve just been discussing. Self bias takes care of tube drift? Please explain how it does that continoulsy?
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