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In Reply to: so much to learn, young Cigna. posted by Joelt on November 29, 2004 at 09:14:14:
"Actually the concept applies to non-feedback amps as well."Joel, your original response to Willie was that he should be careful or he might screw up the delicate balamce of the feedback loop.
BTW: Any tone or attitude in my posts was just an imitation of your own. I probably shouldn't post right after getting home from work, but I have nothing to appologize for.
Follow Ups:
> > ...your original response to Willie was that he should be careful or he might screw up the delicate balance of the feedback loop. > >Nope. Didn't mention feedback loops.
"Are you aware that many of these old feedback amps were designed so that all the power supplies had the same time constant?"
Cigna reading retention score: F
Certainly the implication of what you did write in your original response to the question is that the various power supplies were designed to have the same time constant in order to facilitate the proper function of the feedback circuit(s). This is the way I (an intermediate neophyte) interpreted it. It seemed to make sense that preserving the time constant would be a good thing to do in association with applying NFB. So, Cigna gets at least a B+.
It's probably worth nothing that if you are trying to avoid LF instability in a feedback amplifier, perhaps the last thing you want to do is have all the supply sections have the same time constants.-Henry
> > It's probably worth nothing that if you are trying to avoid LF instability in a feedback amplifier, perhaps the last thing you want to do is have all the supply sections have the same time constants. > >Not the "supply sections" Henry, but the different supplies - ie. negative grid bias for output tubes, B+, any screen supplies, etc.
Joel
so what kind of feedback were you referring to?.
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