Bill said:
>As I mentioned, this technique is covered in any recent ARRL handbook
in the HF amplifiers chapter.<
That deals nicely with the output side. But 811s and 572s have very long grid
leads, which make them awful bloody things at 30, let alone 50MHz. So
personally, I wouldn't touch them with a barge pole (as the saying goes) on 6.
I suppose you could series tune the grids to resonance, but I have doubts about
the resulting efficiency at the end of the day. The spacing is enough for, I
suspect, transit time to start coming into play, as well as the gain dropping
because of cathode lead impedance.
73
Peter G3RZP
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