I have completed my 2 tube 4-1000A amp but am experiencing self
oscillation when I apply plate voltage. My question is do I need to add
a neutralization capacitor in the plate line? I reviewed all the
schematics and artical's I used for research and found none to be used
with the 4-1000 I did notice there use in the 3-500/3-400 amps. I am
running the tubes grounded grid feeding the input thru .01 caps to each
socket with a .01 across my input divider. The entire cathode end of
the tube is in a metal enclosure below the RF deck. I also bypassed the
filament leads going in the enclosure with .01 caps. Any ideas?
Bob, kc0hfl
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