All
I am back on my 4CX5000 project and as it not done yet, I am still
contemplating the circuit to be used.Earlier this year I got solid info from
this reflector for GG operation and that look like a pretty good
solution.However, I was wondering about passive grid, grid driven also.
The question is: How do a calculate the stability? If I simply do math for
tube voltage gain I get something like 25.Then if I calculate the feedback
capacitive voltage divider, Grid to Cathode 120 pf, Plate to Grid 0.7 pf, I get
less than 0.01 for the ratio. If the beast needs the voltage gain times
feedback gain to be above 1 to oscillate, to me it seems this tube is stable no
matter what. Where did I err if I did?
Thanks!
MarkkuWW1C
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