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In Reply to: RE: What the hell could explain this? posted by Rick W on March 14, 2015 at 13:58:54
The amp is around 20 years old by now.
ANY chance the PS caps are in the starting stages of simply 'going south'?
They may be 'drying' up (out?) and getting near the time of failure.
Changing them NOW is a low risk proposition which ANY tech should be able to pull off without problem.
heck, if I could get the right or even upgraded parts (IF 85c, than 105c), I could do the job.
Too much is never enough
Follow Ups:
why has the hum gone away after I just lightly tapped all the caps? This happened twice, weeks apart.
Perhaps you shifted the internal foils when you knocked them? My guess is that with use, and with an aged or impoverished insulating medium, EMF forces may cause them to work themselves back into looser arrangements. This might cause the hum you hear.
Big J
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
One explanation or another?
IF new caps do the trick, than the explanation can wait for a dissection of the OLD caps.
Yeah, caps of the PS type DO dry out. The media is an Aluminum carrying 'goo'. And sure, why not? The Dry Dielectric 'flopping' in the field. Tap Tap and it setttles down for a week.
Make SURE you use 105c rated caps. Even IF 85c had been spec'd.
Too much is never enough
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