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The most simple way to describe it is -
With a class-A amplifier the power taken from the DC supply remains constant regardless of signal power output. The device(s) internal dissipation decreases by the same amount as the signal power output (drive level) increases. If there's any change in power taken from the DC supply as the power output changes then the device is not operating under class-A distortion-less conditions. KISS. KISS. KISS. KISS. To slightly change the subject, anybody who mentions a conjugate match doesn't know what he's waffling about. And if I remember correctly, a 6N7, a class-B dual-triode, metal tube was specially designed to have a very high Mu and could be operated under very simple zero-bias conditions. Each of the two triodes handled one half of the complete audio sinewave. With grids in push-pull and the anodes in parallel, you could get 10 watts out of it as an HF frequency doubler. But it would still take the skin off your fingers. Ahhh! Happy days! ---- Punchinello. |
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