Here is the thing with low gain tubes

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In Reply to: Recommend a cathode resistor for PP 300B posted by zacster on May 12, 2020 at 12:05:48:

You have to make sure the driver tube can supply enough signal voltage to drive the output tubes. If you set your bias voltage for the output pair at -40v and need a 70 volt signal for full power into the tube, you will be making your driver try to push Class A2, which it clearly can't do.

Designing an amp needs more than just output tube current setting.

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Follow Ups Full Thread

Topic - Recommend a cathode resistor for PP 300B - zacster 12:05:48 05/12/20 (3)

Here is the thing with low gain tubes - Chip647 22:12:43 05/13/20 (0)

RE: Recommend a cathode resistor for PP 300B - hifipaul 19:15:16 05/12/20 (1)

RE: Recommend a cathode resistor for PP 300B - zacster 14:47:13 05/13/20 (0)

Follow Ups

Here is the thing with low gain tubes - Chip647 22:12:43 05/13/20 (0)

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