But, there's a really nice distortion you get when the power-tubes are getting pushed, and, according to that article it's the phase-inverter that is responsible for that sound. With a lot of amps we rely on the pre-amp stage to provide the distortion, so the power-amp tubes really should only amplify. At least that's the idea for an amp running very cleanly. It's feeding the signal from the pre-amp into the power-tubes and has to make that signal change very cleanly, without adding any distortion. It makes sense that the phase inverter is very important. There are no amp adjustments necessary when you change the phase inverter. It's much too long to quote, so I'll link to Myles Rose's paper about the Phase Inverter and quote this:īefore you go to a pricy output set of tubes and a possible need to rebias the amp think about a simple phase inverter change.
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