I have had bad electrolytic capacitors and sometimes semiconductor
type devices cause noise. With a scope you can trace through the audio
signal path and determine where the noise is being generated.
Sometimes finding intermittant noise problems can be tricky. An
experienced tech should be able to fix this for you.

Jerry G.

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On Jan 29, 8:49*pm, powerdoc wrote:
Bought it cheap because of this noise. *Right channel only. *When
cold, noise is infrequent and as it warms up gets *to be an
intermittent scratching with occasional louder pops. *Anyone with any
experience on this unit or someone who can offer an idea as to the
culprit? *It is beyond the balance control as the noise is unaffected
by it's use. *What's the most likely component to be doing this? *Any
suggestions appreciated. *Thanks!