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In Reply to: When capacitors fail? posted by digepix on January 16, 2015 at 12:51:52:
On a Manley 120 I got a bright white flash and loud pop from the amp (not the speaker) followed by another a couple seconds later. Music continued to play as I reached to shut it down. The caps measured fine on a Fluke meter, so I sent it in. Manley tech Paul Fargo played the amp without incident for about a week before getting the same. So in this case at least, a p/s cap can fail, then continue to work. (The two flash/pops were the bad cap failing, and one of the others failing a second or two later as it became overloaded from the first.) There was no visual indication that the cap was going; no puffiness, leaking, etc. that you could see without removing the cap. (I don't know what the business end of the cap looked like after it was taken out.)
The amp had about 30,000 hours on it and was about nine years old. Paul recapped the p/s and it's been fine. I recapped the p/s on its mate, so we should be good for a while now.
WW
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Follow Ups
- No warning here - Bill Way 02/14/1511:18:27 02/14/15 (0)