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Original Message
RE: Changing the Gain
Posted by Eli Duttman on March 16, 2017 at 09:24:49:
Some tubes are made with a control grid helix that varies in pitch. Remote cutoff pentodes associated with AGC are pretty common. In triodes, the 6ES8 comes to mind.
The mu varies with the amount of bias voltage applied. The association with AGC should be obvious.