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RE: 6AF4A Useful?

With a gm of 6.5 mA./V., the 6AF4A should easily get you an O/P impedance under 200 ohms. That looks pretty darned good to me. Given the type's UFH capability, put a 4.7 Kohm CC stopper on all grid connections, as you would do for other "touchy" types, like the 5842.

Eli D.

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