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Re: one thing to look at

When the impedance of the OPT increases, the tube sees an easier load making tube amplification distortion lower. But this is in the expense of power, which may not be a big issue.

This is only true for the case of triodes. Pentodes and UL are a bit more complicated than that. I would STRONGLY recommend that you get a copy of "Understanding Hifi Circuits" by Crowhurst. He does a step by step comparison of the operating modes using one tube type as a constant (5881) and how load impedance affects each mode as regards power, distortion, and drive.


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