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RE: 6AF4A Useful?

Posted by Eli Duttman (A) on May 18, 2017 at 11:59:36

In Reply to: RE: 6AF4A Useful? posted by Tre' on May 18, 2017 at 09:09:47:

I don't know. As gm increases, I increase the stopper value. My seat of the pants value for the low gm 'X7 triode is 100 ohms. OTOH, the high gm 5842 has 4 grid connections and I advocate 4X 10 Kohm parts arranged in a "cone" on that tube.

A tiny ferrite bead cemented around, but not touching, the grid's socket lug(s) is another anti-parasitic oscillation method. I like that idea on the "upper" triode of a cascode, as that grid should be at AC ground.


Eli D.

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