The very nature of push-pull tube amps with two or more output tubes feeding an output transformer requires that the signal entering that stage be split into two, each reverse-phase of the other. many novice builders will display a decent understanding of the big output tubes and output transformer, but some might take a while to grasp the component that kicks it all off: the phase inverter (or PI for short). When an amplifier’s output stage is discussed. In the eighth part of Mojotone’s new series What Does This Thing Do? we’re taking a look at the phase inverter, the gateway to the output stage. There are a lot of mysterious components within any guitar amp, many of which remain puzzling even to hobbyists who have built a DIY project or two.
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