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In Reply to: RE: 811A - A2 amplifier posted by sganti on September 13, 2014 at 14:25:45
I must say, the 811A sounds superior {to my ears} in every way to a 300B. One cannot ignore George Anderson's powerdrive... using SS for current is the right use for chips as that is one area where valves just fall flat on their face. That circuit you have built has left nothing to chance.
Most excellent.
The Mind has No Firewall~ U.S. Army War College.
Follow Ups:
Seriously, if you're going to interject SS sonics into the signal chain, why bother with the 811A and all its messy support circuitry? It's a lot of trouble for little or no benefit.
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Buy Chinese. Bury freedom.
Hmm, I would not castigate another for using SS for the bottom end below 100 hz even though that is not my cup of tea. Live and let live say I. Perhaps I practice more tolerance in certain areas than others... I do not know. I DO know tubes swing voltage effortlessly... which explains their use even today in broadcast transmitters. They do NOT like current, the obvious domain of SS. The proper tool for the proper job say I. If you have not utilized 'power drive'... in other words, IF you are practicing "contempt prior to investigation" you MAY remain...
in everlasting ignorance.
The Mind has No Firewall~ U.S. Army War College.
With all the feedback involved in a source follower how much SS sonics will there be?
TK, I don't know the answer to this question.
I'm using the "mu" outputs of the SS CCS's in the plate circuits of the stages in the phono pre.
Unless I completely redesign around totally different tubes I have no choice, I need the lower output impedance they provide.
I don't "hear" anything I would call SS sonics but 'what do I know'?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"With all the feedback involved in a source follower how much SS sonics will there be?"
A better question might be whether we can be certain the chacteristics of SS aren't audible in such a circuit. Like you, I'm not sure, but why take the chance? There have been many tube-based circuits designed through the years that are capable of driving an output stage into grid current with low distortion. I suspect using a MOSFET this way has more to do with parts availability and cost than with sonic integrity.
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Buy Chinese. Bury freedom.
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