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In Reply to: RE: That's wrong. posted by Mark Kelly on September 08, 2014 at 15:52:46
Mark, were the amplifiers you measured transformer coupled like the one under discussion? Also, tell me what you mean by "slide" and how you measured it. SPICE is showing the exact action I would expect from this topology.
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Buy Chinese. Bury freedom.
Follow Ups:
I shouldn't have responded, I have no desire to go into the minutiae of this.I gave up on grid driven A2 a long time ago, I think it's a fundamentally flawed topology. My experience from when I was working on it about two decades ago supports what Paul has said.
Mark Kelly
Edits: 09/08/14
Clearly, different builders have different experiences. My SE 211s can be driven to 30W in A2. The transition from A1 is virtually seamless, and I'm extremely pleased with the way they sound. Difficult for me to imagine ever building a high power DHT any other way. Different strokes and all that... :)
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Buy Chinese. Bury freedom.
Agreed, I love A2 once the power gets high. My 833C SET monos do 40W in A1 and then transition to A2 up to 200W. Sound is incredible. Spice sims show typical harmonics in A1, with second dominating, then transitioning to more third and higher harmonics as the amp goes progressively into A2. At that point it's pretty loud (he he).
"At that point it's pretty loud"
What speakers?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Infinity RSIIb. They should be up near 100dB at 40W. Of course the peaks need more, hence the 200W capability. They get as loud as I can stand without breaking a sweat.
Very nice.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"My 833C SET monos ... transition to A2 up to 200W."
Those would make dandy preamps for these little Westinghouse units...
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Buy Chinese. Bury freedom.
Those would make a great calibration standard for WAF, to set the zero point.
Yeah, but just think... what if you got away with it??!!
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Buy Chinese. Bury freedom.
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