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All very good advice for someone like myself with little to no knowledge.

I replaced the original relay about a year ago.

The reason I changed it out to a newer one was because of the incredibly loud pop that comes through the speaker of these Sonar's when the mic is keyed.

The new relay actually lowered that popping sound tramendusly (the pop would bother the yl 2 rooms away.) The one I replaced it with has a red led inside of it.

It lights up when the relay is activated.

I will do everything you've suggested.

I should get to it tomorrow.

I'm optimistic about finding the problem using the methods you've listed. I don't know which tubes work the recive side, but I know certain ones don't. I'll just tap the one's I'm not sure about while the rig is receiving 100%. I have plenty of backup tubes. I'm really feeling good about finding the problem. Thanks nomad. 73.

PS I'll post my results asap.