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Re: Ray, take a look at this

I see what you mean. I was aware of the danger of confusing amplitude with RMS, when calculating plate current with signal applied. For that reason, using LTSpice, I measured the RMS current flowing through the voltage source that feeds the OPT center tap. This was during maximum signal, at 1kHz, averaged over a time period of 200ms, and I got a figure of 250mA (this excludes the screens, which are fed from a separate voltage source).

I now doubt that the figure LTSpice gave me was, in fact, the correct RMS current. Either the simulator is wrong, or I misinterpreted it. From your example, the RMS plate current over the two tubes at max. output is ~175mA.

Thank you for putting me straight!


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