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In Reply to: Circlotron posted by Lew on May 11, 2005 at 10:34:11:
Actually, the M60 is technically Class A all the way to 60watts. But that is only by definition and only because the 6as7g refuses to cutoff.In a true Class A amplifier there is equal current above and below the idle point. Zero total current change. One bank going up by X amount while the other bank goes down by THAT SAME AMOUNT. This would be with linear tubes like the DHT's. Biasing is done at the center point of operation. If the tube is biased at 60ma. it will move up to 120ma and down to near zero with very little non-linearity in that movement. The current draw on the power supply will remain almost constant. What is described in this paragraph in not what is happening in the M-60 above 5watts.
On the Atkins site, while describing the Vox AC-30 guitar amp and whether or not it's Class A,
"There is an equal amount of current swing above and below the quiescent point, which indicates an average change in plate current of zero, which is another characteristic of a true class A amplifie" He shows some nice graphs that explains what I'm saying.Tre'
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Follow Ups
- Re: Circlotron - Tre' 13:28:33 05/11/05 (1)
- I forgot the URL - Tre' 13:31:36 05/11/05 (0)
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