A neighbor has a stereo receiver from the 8-track days. He listens on
it to his favorite station every day. Yesterday he got loud white noise
on both channels, as if he were tuning between stations with the volume
turned up.

Turning down the volume control and changing sources don't affect it, so
it must be in the power amp. What failure could cause white noise in
both channels of a stereo amplifier?

Choreboy:
You are probably correct in your assumption..... a failure in the power amp
circuitry...... output devices? coupling electrolytics? driver
transistors? faulty solder connections?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

"Choreboy" wrote in message
...
A neighbor has a stereo receiver from the 8-track days. He listens on
it to his favorite station every day. Yesterday he got loud white noise
on both channels, as if he were tuning between stations with the volume
turned up.

Turning down the volume control and changing sources don't affect it, so
it must be in the power amp. What failure could cause white noise in
both channels of a stereo amplifier?

What would affect both channels except the power supply? I don't know
how a PS problem would cause white noise. It's pretty loud, probably
more than 80dB.

sofie wrote:

Choreboy:
You are probably correct in your assumption..... a failure in the power amp
circuitry...... output devices? coupling electrolytics? driver
transistors? faulty solder connections?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

"Choreboy" wrote in message
...
A neighbor has a stereo receiver from the 8-track days. He listens on
it to his favorite station every day. Yesterday he got loud white noise
on both channels, as if he were tuning between stations with the volume
turned up.

Turning down the volume control and changing sources don't affect it, so
it must be in the power amp. What failure could cause white noise in
both channels of a stereo amplifier?

"Choreboy" wrote in message
...
What would affect both channels except the power supply? I don't know
how a PS problem would cause white noise. It's pretty loud, probably
more than 80dB.

sofie wrote:

Choreboy:
You are probably correct in your assumption..... a failure in the power
amp
circuitry...... output devices? coupling electrolytics? driver
transistors? faulty solder connections?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

"Choreboy" wrote in message
...
A neighbor has a stereo receiver from the 8-track days. He listens on
it to his favorite station every day. Yesterday he got loud white
noise
on both channels, as if he were tuning between stations with the
volume
turned up.

Turning down the volume control and changing sources don't affect it,
so
it must be in the power amp. What failure could cause white noise in
both channels of a stereo amplifier?

multiple failures (stuck on FM tuner and volume control failure)

listing make and model might be helpful.

if its a cheapie from sears it might be time to replace it with a cheapie
from wallmart

TimPerry wrote:

"Choreboy" wrote in message
...
What would affect both channels except the power supply? I don't know
how a PS problem would cause white noise. It's pretty loud, probably
more than 80dB.

sofie wrote:

Choreboy:
You are probably correct in your assumption..... a failure in the power
amp
circuitry...... output devices? coupling electrolytics? driver
transistors? faulty solder connections?
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

"Choreboy" wrote in message
...
A neighbor has a stereo receiver from the 8-track days. He listens on
it to his favorite station every day. Yesterday he got loud white
noise
on both channels, as if he were tuning between stations with the
volume
turned up.

Turning down the volume control and changing sources don't affect it,
so
it must be in the power amp. What failure could cause white noise in
both channels of a stereo amplifier?

multiple failures (stuck on FM tuner and volume control failure)

listing make and model might be helpful.

if its a cheapie from sears it might be time to replace it with a cheapie
from wallmart

The owner was mistaken. The noise was on one channel. With a scope and
a multimeter, I determined that the problem is within the amplifier IC.
It's time for him to buy another garage-sale receiver.