Yes, those Rifa, Wima, and so on, mains-bypass paper caps in clear epoxy always fail, they're notorious. Over time the epoxy cracks letting in moisture which degrades the paper. They may be rated to fail without bursting into flames, but they sure make some smoke.
Replace on sight, with an appropriate X/Y-rated part. -Dave Wise ________________________________ From: Chuck Guzis via cctalk <cctalk@classiccmp.org> Sent: Sunday, June 16, 2024 7:58 PM To: cctalk@classiccmp.org <cctalk@classiccmp.org> Cc: Chuck Guzis <ccl...@sydex.com> Subject: [cctalk] Re: The magic smoke.... On 6/16/24 19:42, Dave Dunfield via cctalk wrote: > Chuck Guzis wrote: >> Probably due to the failed film-in-oil (sometimes known as Rifa) line >> filter capacitors--a very common failure and nonfatal. > > I never "just turn on" equipment that's been out of service for an extended > period of time ... until I ... Point taken, but in this case no amount of "reforming" will fix those old 'Rifa" filter caps. --Chuck
