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JJ 12ax7

Posted by Tre' (P) on April 28, 2024 at 20:30:23

I was given some of these 12ax7s and they look like they are designed like a Guided grid valve. You can see the "Active Anode Area" in my picture. They look like they are built like a 6gk5.

I wonder how they get a tube, that is designed so differently (than the standard 12ax7), to act like a 12ax7?

Most of the plate is screened from the grid so tubes made this way have almost no interelectrode capacitance (and therefore almost no Miller capacitance).

Tre'

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

Edits: 04/28/24 04/28/24

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