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In Reply to: RE: Can an amp be both push pull and SET? posted by tz7 on September 12, 2014 at 18:34:52
The only way this makes sense to me is if the initial gain stages are single ended but then the output stage is push/pull. Lots of amps are made this way. But a push/pull stage can not be operating as an SET.
Follow Ups:
"The only way this makes sense to me is if the initial gain stages are single ended but then the output stage is push/pull. Lots of amps are made this way. But a push/pull stage can not be operating as an SET."
That's what I initially thought too; however, I think that they are implying something different. I think what they are implying is that if each phase of the PP amp's signal chain is run class A into the output tranfsormer, it is similar to two SE amps running out of phase with the signal combined in the output transformer. That's certainly not what one considers SE, but for marketing purposes it "ticks" all the correct boxes and has all the right buzz words and that should sell more amps.
I think it's the marketing folks appealing to the masses.
...I agree their implications are quirky. No matter how hot the finals are biased (Class A) or gently driven, their phase/anti-phase into the OPT will show up on the oscope - hence PP.
And like all PP amps there will be little even order harmonics which is quite different from an SET amp. And I suspect the amp won't compress the negative half of a sine wave like an SET.
Edits: 09/13/14
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