I am stumped by an issue with my old trusty R4A. The audio amp, 6EH5
tube is running with a red-hot plate.
All of the DC voltages look good and there is no input signal except the
real one when the gain is advanced. There is a very large (5V P-P) on
the output side. It is low freq (120 hz.
The radio has new electrolytics on main and bias supplies and I tried
replacing the polarized tubular decoupling caps in this stage to no avail.
I saw the note about anti-vox oscillation in the R4B tech notes and
tried that but no change.
About the only thing I havent tried is the audio transformer. the
primary reads about 240 ohms.
The audio out from the speaker is about half what it should be.
Any suggestions?
Thanks,
Curt
KU8L
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