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RE: Pentode/Triode Operating Points (6BL8,6U8,6GH8,7199 etc)

My experience (sample of one...)

Had a Stromberg ASR120, which uses a gain stage and inverter similar to the Dyna circuit. Rewired the sockets for 6U8, etc., no component value changes. Put in two Amperex 6BL8s; they had voltages quite different from the schematic, but two 6GH8s were right on, so that's where I stopped. If I had to make it work with a specific tube, I'd probably add a 1 meg pot in series with the screen resistor (which I'd reduce...), and adjust it for 3/4 and 1/4 of the supply voltage on the triode plate and cathode.


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  • RE: Pentode/Triode Operating Points (6BL8,6U8,6GH8,7199 etc) - Tom Bavis 19:47:47 08/31/16 (2)

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