[Sander deWaal]

"Arny Krueger" said:

wrote in message

oups.com
Thanks for the advice. I did isolate the problem. One
thing I know is the fault of my receiver, though, has
puzzled me for years. When I first turn the stereo on,
both channels crackle.


Probably due to dirty switch or level control contacts.


The crackling quickly subsides.


This actually leads me to believe some electrolytics are on their way
out.

In short, your receiver needs an overhaul.
Replacing electrolytics, resoldering the PCB boards, cleaning or
replacing switches and potmeters, and perhaps some small signal
transistors.
Types such as 2SC458 etc. are prone to crackling and noise problems,
as their leads are suffering from oxidation.
You can check this by looking at them, the leads will show a black
tarnish that will also affect the internals of the transistors.

And be sure to clean or replace the speaker relay as well.

If you're able to handle a soldering iron, this job will cost you
maybe 2 hours, and some small stuff like electrolytics and
transistors.
Actual replacements for small signal NPN types (2SC, 2SD) are 2SC2240,
for PNP types (2SA, 2SB) are 2SA970.
Readily available from Digikey, Mouser, and perhaps even Radioshack.

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