Rich said:
>" but they discovered that 3-500Zs have a cutoff frequency that's above 2MHz"
I expect Rich, that you managed a wry smile on hearing that!
Maybe it's because the large electrode spacing is such that at low frequencies,
the electrons haven't reached the plate before the grid phase changes, and they
get lost. Or maybe accelerated so much that they heat the plate up instead of
providing RF out?
Phineas T. had it about right...............
73
Peter G3RZP
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