[R-390] need help with R-390A symptom

[Bob Young]

After my radio been on for perhaps 10 minutes, the volume will instantly increase along with some hum to where you can still hear it with the volume on 0, this happens suddenly almost like a bad connection just got straightened out excpet for the hum. Something as simple as switch from one antenna to another will make the radio go back to normal. Also turning it from on to standby and back again always straightens it out. The AGC seems to work fine. I had suspected maybe a partially burned antenna radio relay at first but don't think it could be that. It will do this off and on for a while and sometimes after several hours it seems run normally for a while. Any ideas on where I should begin to look?

Bob Young
Analog, MA
KB1OKL

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