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In Reply to: Some suggestions posted by Russ57 on September 18, 2004 at 09:00:39:
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They do not suffer from moisture problems and seldom leak. Black Cats are similar to the Good Alls, one of the very first Mylar caps used in audio.My philosophy on this is that "If It Ain't Broke, don't fix it". The Black Cats on my units are still working fine, so why replace them?
So, I guess Dave Hafler wasn't that cheap after all. He could have used plastic molded paper types such as Black Beauties. He instead used a mylar cap for greater reliability.
is ceramic. If you are happy with the sound of the unit as is that's cool. I was only trying to help based on my experiences with the PAS. If you feel the sound is somewhat soft and vauge replacing those caps with even a cheap polypropylene like orange drops will make a big difference. The tolerance rating on most of the stock resistors is 20%. Plus they usually drift quite high in value over the years. A new carbon film will have a 5% tolerance and won't drift much over time. But the only way to find out is to try it. I sincerely doubt you will want to go back to the old parts if you do bother to replace them but you always can and it really isn't more than 50 bucks and one afternoon of your time.
Caps go through a dielectric contamination process over time, especially under extreme stresses (high voltage, temperature). It may not be easily apparent from listening. My acid test is to measure the grid voltage. If you observe any DC - beware!
If you think those are cool, try the beautiful silver cover of paper in oil... NOS "Vitamin Q" look great!!!
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