[r-390] 5651 tubes

[DAVID MEDLEY]

I am presently working on an early R-390 radio serial #99. This radio is =
in wonderfully good condition considering its age. I have replaced all th=
e tubes with NOS and when I fired it up there was a loud tuneable hum on =
all stations. The problem turned out to be that I had replaced the 5651 t=
ubes in the VR with 5651A tubes. Restoring the 5651s the radio works grea=
t. Can anyone explain this phenomena for me?
Dave


end
David Medley
Tucson AZ


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