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RE: 6AF4A Useful?


The 5842 and 6C45П (6s45p) come annoying close to oscillating, while sitting in the cardboard box. FWIW, I say take no prisoners. A 10 Kohm CC stopper on each grid connection, a 100 Ω CF stopper on the plate connection, and ferrite beads on the heater wires is (IMO) not overkill.

The "in box oscillators" were designed for grounded grid RF duty. Setting them up common cathode requires stringent precautions. I've seen documentation with RF chokes in the heater wiring, when set up grounded grid.

Eli D.

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