Hi Hans,
> I talked about a super cathode tetrode amp with the grid rf shorted to the
> cathode with caps. I forgot to mention that the 4CX1000A runs with normal
> G1 and G2 voltages for class AB1. No grid current - good for this tube
> with its fragile G1. What I also discussed was the G1 resonance you get
> with the internal grid structure and those rf shortening caps. If this (
> these?) resonances are high enough in frequency where the tube gain is
> low, then no risc for parasitics?
I've never measured that circuit with that tube, so I do not know the
answer.
I've measured many dozens of normal cathode driven and grid
driven PA's. The 4CX1000 used in more common configurations
can be very stable if the screen is well bypassed.
73, Tom W8JI
w8ji@contesting.com
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