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In TUT, you say never to use 6V6 in circuits having over 400V, but the FAQ here says 450V is okay and TUT3 says even higher voltages are okay. Which is right?

April 26, 2017circuits tut

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In TUT, you say never to use 6V6 in circuits having over 400V, but the FAQ here says 450V is okay and TUT3 says even higher voltages are okay. Which is right?

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Later books supersede previous works when there is a conflict of view. With respect to the 6V6, this is a pretty tough tube. It can handle 1,200V in TV circuit operation, so an audio amp with 470-500V is not really a problem. Just be kind to the screen by using at least a 1k or higher flameproof resistor for each tube and bias the tube properly. The books were released in this order: TUT, POP, TOT, TUT2, RSG, SSH, SPKR, TUT3, with TUT5 and TUT4 coming out next in that order.