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RE: red plates ... bob and weave ...

"My systems use an amp-factor of 100."

Dennis, you use a driver tube with an amp-factor of 100. The stage you are running it in has a gain of less than 70. Edit, after recalculating I should have said "less than 80".

The amp-factor of the tube (also called "mu") is (in theory) the maximum gain you could get from a stage built with that tube and can never be fully obtained. You need a horizontal load line to get you close. 285k ohms will not give you a horizontal load line for a 7b4.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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