You don't need to change R30/31 but you may need to change the bias range resistor R43 so you can set the Fixed bias correctly. Same with the 500R 5W R34/35 if you plan to run in cathode bias mode. We haven't done this so you will need to CAREFULLY experiment. I would think it would work with no mods but make sure you do the tests and calculations to determine the safe operating of the amp power tubes or get a tech to make the changes for you if you are concerned. Keep us posted on your progress.
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