I had a similar problem a few years ago. Fortunately i knew a young man
who was working his way through college repairing stuff. He repaced the
output transistors in the faulty chanel.
Later he reconed my Radio Shack speakers.
He graduated with a Master's degree in Electrical Engineering, and then
moved away.
He visited here last summer and showed me how to clean my old VCR.

I've swapped speaker wires back and forth, and the "dead" channel is CM>definitely "dead". Connect the right speaker up to the left channel, CM>and nothing. Connect the left speaker to the right channel, and it CM>works. Connect the left speaker to the left channel, nothing.
I ended up with both speakers connected to the right channel, one CM>connected to the right channel on the "A" speaker controls, and the
other one to the right channel on th "B" speaker controls. I had CM>monaural sound, but at least it was coming out of both speakers. Now, CM>just the right speaker is working. I haven't, at this point, checked
the connections on both right channels (A and B), so I will check that CM>just to make sure it's not one of my 20+ year old speakers giving up the CM>ghost.

st_buffer * OLX 2.2 * Geoff in State College, Pennsylvania. glw4-at-psu.edu
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Good. I feel relatively comfortable with the 20-Amp-and-under circuits BM>(but not enough to be casual!), but it took me quite a while to get BM>enough nerve to go inside the service panel.

As long as the power is off.... <G> I know where the main breaker box
for the building is, so it wouldn't be any trouble to shut it off there,
before changing a breaker somewhere else.

electronic devices together. ...Well, let's see: twenty years ago was BM>1990, Maybe half the amount of the other devices.

I got it about 1988 or 1989, I think. I know I was out of the dormitory
on base, and living in a "manufactured home" at the time I bought it.
Got it from Montgomery Ward's, who was still in business at the time.

one working channel?!) to assure the problem isn't something simple like BM>a disconnected or shorted speaker wire, open speaker fuse, or an

I've swapped speaker wires back and forth, and the "dead" channel is
definitely "dead". Connect the right speaker up to the left channel,
and nothing. Connect the left speaker to the right channel, and it
works. Connect the left speaker to the left channel, nothing.

oxidized switch contact. Hate throwing out perfectly good 20-year-old BM>hardware!

I took the cover off the receiver and went at it with a can of tuner
cleaner. Cleaned the control knobs as best as I could with the cleaner.
Helped a tiny bit, for a while, but didn't fix the problem.

I ended up with both speakers connected to the right channel, one
connected to the right channel on the "A" speaker controls, and the
other one to the right channel on th "B" speaker controls. I had
monaural sound, but at least it was coming out of both speakers. Now,
just the right speaker is working. I haven't, at this point, checked
the connections on both right channels (A and B), so I will check that
just to make sure it's not one of my 20+ year old speakers giving up the
ghost.


-=> Carroll McAllister on 2/25/2010 at 4:23 PM <=-

Coming to you "almost live" from Searcy, Arkansas

carrollmcallister@earthlink.net




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Hi Carroll!

Good. I feel relatively comfortable with the 20-Amp-and-under circuits
(but not enough to be casual!), but it took me quite a while to get
enough nerve to go inside the service panel.

As long as the power is off.... <G> I know where the main
breaker box for the building is, so it wouldn't be any trouble to
shut it off there, before changing a breaker somewhere else.

Just make sure you run your lights first -- gets dark with the power
off! <g>

electronic devices together. ...Well, let's see: twenty years ago was
1990, Maybe half the amount of the other devices.

I got it about 1988 or 1989, I think. I know I was out of the
dormitory on base, and living in a "manufactured home" at the
time I bought it. Got it from Montgomery Ward's, who was still in
business at the time.

Montgomery Ward Catalog is still going, plus somehow they affiliated
with Seventh Avenue about a year ago. We barely noticed a red
"Montgomery Ward" sign painted on the darker wood above the Seventh
Avenue store windows. "Has that always been there??" Went in and asked
- nope: was new.

one working channel?!) to assure the problem isn't something simple like
a disconnected or shorted speaker wire, open speaker fuse, or an

I've swapped speaker wires back and forth, and the "dead" channel
is definitely "dead". Connect the right speaker up to the left
channel, and nothing. Connect the left speaker to the right
channel, and it works. Connect the left speaker to the left
channel, nothing.

OK - good checking.

oxidized switch contact. Hate throwing out perfectly good 20-year-old
hardware!

I took the cover off the receiver and went at it with a can of
tuner cleaner. Cleaned the control knobs as best as I could with
the cleaner. Helped a tiny bit, for a while, but didn't fix the
problem.

OK. If by "helped a tiny bit" the speaker came to life, then you found
the problem in the switch. And admittedly replacing the switch
sometimes means disassembly of the almost the entire unit -- at this age
I don't think it's worth it!

I ended up with both speakers connected to the right channel, one connected to the right channel on the "A" speaker controls, and
the other one to the right channel on th "B" speaker controls. I
had monaural sound, but at least it was coming out of both
speakers. Now, just the right speaker is working. I haven't, at
this point, checked the connections on both right channels (A and
B), so I will check that just to make sure it's not one of my 20+
year old speakers giving up the ghost.

IIRC the "A" and "B" are the same output, just run through switch which selects only the "A" pair, only the "B" pair, both, or neither
(headphones). (And the headphones output is run from the same output as
the speakers get their source from, just with a dropping resistor in
line.) I would definitely check to see (or hear!) if the "B" channel
works in stereo -- if it does the problem is at that switch, and the
easy fix is to move the speaker leads to that set of outputs.


¯ ®
¯ Barry_Martin_3@ ®
¯ @MSN.COM ®
¯ ®


... "What part of 'no' don't you understand? Is it the 'N' or the 'Zero'?"
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