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Old 11th September 2006, 06:40 AM   #1
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I'm planning to build a 200w/ch transistor amp for my DIY
electrostatic full range speakers.

I wonder if there is any benefit in including the 200:1 step up
transformer in the feedback chain, as in tube amps?


regards, Jonas
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Old 11th September 2006, 11:12 AM   #2
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Theoritically it should have a benefit because it would include another non-linear component inside the feedback chain.

In practise I don't think this would work because the phase shift of the transformer would make the loop unstable.

The fact that it is never done (as far as I know) should be a powerfull omen....

Jan Didden
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Old 11th September 2006, 11:28 PM   #3
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Isn't that what McIntosh does? From what I remember of the last set of schematics I saw, they have a large "autoformer" between the outputs and the 2/4/8 ohm speaker output taps and the 8 ohm output tap feeding back an error correction signal.

Can anyone else confirm this topology?
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Old 12th September 2006, 01:20 AM   #4
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Quote:
Originally posted by DCPreamp
Isn't that what McIntosh does? From what I remember of the last set of schematics I saw, they have a large "autoformer" between the outputs and the 2/4/8 ohm speaker output taps and the 8 ohm output tap feeding back an error correction signal.

Can anyone else confirm this topology?
But the problem is,where are you going to get the autoformer???
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