And the distortion cancellation is only of even-order harmonics, as I’ll discuss shortly. But push-pull amps are more complex than single-ended amps, requiring a phase splitter, and twice as many output tubes. They can also deliver more power than single-ended amplifiers, if they are biased such that one of the tubes is cut off on part of the signal swing (class-AB operation). Push-pull amplifiers, by their nature, cancel a good amount of the distortion that’s inherent in a tube amplifier. There are devoted followers of all types who believe theirs is the best, often with great conviction! You can group them into two basic divisions: push-pull and single-ended with numerous variations within each group, such as ultra-linear connection, parallel feed, and so on, and you can use different devices (triodes, pentodes, and so on). There are several different basic topologies used to build tube power amplifiers. But I’ve come up with a design that I think hits the mark pretty well (Photo 1). Unfortunately, these goals are all at odds in the real world. Aren’t we all? To me, the ideal amplifier is simple, powerful, and sounds good simple goals. I’ve been on a quest for the ideal tube power amplifier.
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