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Power tubes that are self-biased (a.k.a cathode biased) do not need to be biased, correct?

April 26, 2017a.k.a biased power self-biased tubes

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Power tubes that are self-biased (a.k.a cathode biased) do not need to be biased, correct?

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False. It depends on the class of operation (Class A or Class AB). Due to the nature of their design, the bias of Class AB power amps is more sensitive to tube changes than Class A—the latter typical biased at maximum plate dissipation.