THAT was a question I meant to ask after looking at the cap I pulled: yes, it was marked "EM" and I was wondering if that was a vendor or characteristic designator (like NP0, Z5U, etc). Now I know.
Thanks for the insight. I ordered some replacements from a guy on eBay for very cheap ($1.25 each + about $3.60 shipping). Seeing as Mouser's prices on these were north of $6 apiece, I figured a buck-and-a-quarter each was worth the risk. 73, Steve, W1ES/4 Date: Thu, 11 Aug 2011 23:16:55 -0400 From: Garey Barrell <[email protected]> To: Fred or Ski <[email protected]> Cc: drakelist <[email protected]> Subject: Re: [Drakelist] PTO capacitors..... Message-ID: <[email protected]> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Ski - Yes, those are the 'Dur-Mica' style caps made by 'Electro-Motive', and used by Drake. That some are failing almost 50 years later isn't all that surprising. I haven't run into these failures until just the last couple of years, so perhaps they're all ready to fail! :-) CDE also makes them, and I think the 'Dur-Mica' tag belongs to them. But silver migration seems to be a problem with many silver mica caps. Early 'postage stamp' types were the worst, and it was blamed on poor sealing of the lead/package interface. But then the epoxy dipped type developed similar problems, just some years later. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs <www.k4oah.com> _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
