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RE: 38H OPT for 845, so so?

There is only 1 reason for a high power test and that is for low frequency.
For that we already now that 3500 Ohm need at least 30H, if you have less then automatic the distortion of the transformer will be a lot higher. Unless you are not interested in good bass (or need it for a midrange speaker).
Almost all signal in the transformer is lower flux or very low flux. The more realistic measurements are at low output power. There is a good reason why they measured for decenia at 1W. I know some guys who even think that that is already way to high.
Anyway the distortion of the tube is for many frequencies domminant.

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