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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: update 2

1khz sine wave at input
Connect scope to output with an 8ohm load(load resistor best)
Turn up input until sine wave just starts to flatten at the peaks and read the voltage, its subtle on a tube amp but obvious.
Its crude but gets you close to output wattage. I did it this way for 30 years until i invested in an analyzer.

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