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RE: Sputter/crackle in right channel of old Sony receiver

195.112.32.202

In Reply to: RE: Sputter/crackle in right channel of old Sony receiver posted by caspian@peak.org on September 18, 2009 at 20:08:52

"The noise is not in any of the pots or switches, which have all been cleaned with Caig De-Oxit, but completely independent of them."
How can you be sure, just because you cleaned it?
"Could this be (A) a power supply cap going bad, (B) an output device going bad, or (C) something else going bad? Any suggestions where to start looking?"
A & B unlikey. Most likely IS a dirty switch or pot, OR a bad solder joint. Best found by gently tapping all joints/components (from volume control forwards to speaker outputs) with an insulated stick. A big knitting needle is ideal, if you remember what they are :-)
Edit: since you accurately isolate the fault to one channel, post gain control, only the output amp for that channel is suspect.

Edits: 09/19/09

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