Byron -
Yes, a more negative grid would move the tube closer to cut-off,
reducing its gain. I have seen 'working' calibrators at -45 VDC though.
Have you tried another tube? Anything plugged in to the ACCESSORY
socket perhaps loading down the CAL signal there?
What are you measuring the
Hello-
I am going through an R-4 receiver and the 100 KC calib output is weak. The
receiver sensitivity is very good. The calibrator will only push the S-meter up
to 5 dB over S-9 on 80 meters, and it barely moves the meter pointer on 10
meters (S-meter at max sensitivity setting). Some of
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