cosmos41 at IX.NETCOM.COM
Sat Jan 13 16:12:54 EST 2001
I recently bought a Hallicrafters S-38D (I know...very minimal
receiver!) which was my first receiver back in 1957.
This one has a few problems, some of which I can repair but I need your
help on a pretty simple (for you guys!) problem. Although I've been a
ham since I was 16 years old, the technical side of it just never was my
forte. But now, I'm enjoying working on old radios and really just in
the beginning stages.
Question: When I advance the Volume control to a certain point, there
is a loud "howl" for want of a better word. It sounds like it would
continue getting louder and louder (like feedback) if I didn't decrease
the volume setting. Is this possibly a microphonic tube? If so, would
it be more likely to be the Detector & Audio Amp 12SQ7 whose grid is
connected to the volume control, or could it be the Audio Output
I don't have a tube tester, so I'm kinda shooting in the dark. I have a
lot to learn; I know that! I guess the first thing I've learned is that
I need a tube tester! I could substitute known good tubes if I had any
but hate to buy a full set on speculation.
Anyone have a buoy they could throw a drowning senior?!
As always, my gratitude.
Ron - K5MVR
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