[R-390] Smoke got out

dog agfa at hughes.net
Wed Aug 1 16:36:14 EDT 2018


Thanks Barry,

Well, I'll have to re-wire it first and that will involve pulling some 
parts off in the osc section. What I can do is isolate that filament 
wire temporarily in the plug and put an ammeter on it while I plug in 
the tubes, one by one. Maybe even fuse it while I'm there so I don't 
burn it up again. I'm just not seeing what went wrong though, I really 
can't find anything strange. The wires got hot enough to melt onto 
others and it happened in about 3-4 seconds after I turned it from off 
to agc right after I was messing with the RF section tubes. I didn't put 
one in wrong, I checked that.

Like I said it was acting strange to start with. After I changed some 
tubes and I would switch on the BFO, it would take a few seconds for the 
BFO to come on and go off too. Like the AGC went off. And then there's 
the noise level that would change after warming up a few minutes. It was 
working fine the other day.

I hate switching RF sections between radios and am going to try to avoid 
that.

Dave N3DT



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