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Re: "Source of noise"

I infer that you mean that it's better to avoid pentode mode if that's going to place critical requirements on the PS design. That's what most people do, of course, especially commercial amp designers, mainly by using UL mode. However, UL is not universally accepted and pentode mode has much to offer. If it's only a question of taming the PS to give the screens what works best for them (i.e.a steady voltage from a low impedance source), then why not?


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