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I injected an audio signal into the grid from my iPod. There is not much volume. I am not expecting a lot of output power, but how would I calculate an output power?
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Usually by substituting the loudspeakers voice coil with a dummy load, eg: a resistor that has a resistance equal to the loudspeakers nominal impedance, a sine wave at say 1kHz would be connected to the grid and the RMS voltage developed across the resistor would be measured, Vsquared/R would give the power, having said that, according to the valve data at the HT voltage you're aiming at the output won't be more than 1 watt, and for that a signal of 15 volts peak would be needed on the grid, which is quite an ask for this receiver.
As an approx. guide for unknown loudspeaker impedance, measure its DC resistance and add 20%.
Lawrence.