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In Reply to: RE: non-inverting preamp w/schematic ... posted by deathtube 667 on June 15, 2017 at 16:57:41
Why don't you just flip your speaker wires?
"Why don't you just flip your speaker wires?"
Indeed, the obvious solution would seem to be just to switch over the speaker wires, if you are unhappy with the phase that a given amplifier is feeding to the speakers. The speakers are, after all, the most likely source of asymmetric distortion.
The only reason I can imagine for wanting to maintain a specific phase earlier in the chain is if you suspect that your power amplifier has a substantial asymmetric distortion, and thus you want to feed it with a particular phase from the preamp. (Though why you would suspect that the signal from the preamp, or indeed the music source you are using has a preferred phase I am not quite sure.)
I suppose an SET amp may have high enough asymmetric distortion that the issue of the phasing of the signal it is fed might be of concern. But really, if you are using an amplifier that injects such a degree of distortion, then you are not really in the realm of hi-fi sound reproduction.
If you have Altec or similar speakers with high efficiency, the feedback allows for listening at lower levels without the hair-trigger volume control effect.
I also have another way to control gain levels between the preamp and amp.
I always say look at your system as a system .
High efficiency speakers like Altecs are a huge advantage in designing a system. You need very little system gain which makes everything better, fewer stages, lower mu tubes. If you have a hair trigger preamp, you have wayyyyyy to much gain in your system. Throwing it away in feedback and volume pots just makes everything worse.
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