Ron,
Did you ever try the exercise of putting an approximately 3500 ohm resistor
across the tune cap to simulate tube driving Z and looking into the loading cap
with an antenna analyzer, looking for 50 ohms?
I am in Calif. right now and unable to do any amp work on my 8877 project but
before I had to come here I did that and had good luck. In my case I am merely
trying to see if my tank L taps are set right and if my plate tune cap is in
the right range. But my point is, I was able to see a nice sharp dip to 50
ohms as I tuned the tank caps. In your case, since all is ok on 20 meters you
would have something to compare 80 meters with. Although you obviously wont
see breakdown you might find such things as stray resonances, bad bandswitch
conductivity, etc.
Might be interesting to try.
In my case I am going to a breadslicer for the tuning cap, took out the vac
variable. I ordered some padding caps from "Annas CW Store" on eBay and will
experiment with them in a few weeks.
73
Rick K2xt
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