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| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Sep 01 03:48PM -0400 On 08/28/2018 01:47 PM, Cursitor Doom wrote: > they all tested fine (I have an awful lot of vintage spares here). Not so > sure about the tubular paper caps which I assume you're talking about, > though. Moisture + acid paper + foil = mess. That'll take a lot longer if the cap has metal on five sides. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| tabbypurr@gmail.com: Sep 01 03:56PM -0700 On Saturday, 1 September 2018 20:48:34 UTC+1, Phil Hobbs wrote: > cap has metal on five sides. > Cheers > Phil Hobbs My prewar metal can paper caps are all wax sealed, and every last one tested dead as a very dead thing. The non-metal seal is where it can go wrong. Not sure why they didn't use bitumen. NT |
| whit3rd <whit3rd@gmail.com>: Sep 02 01:15AM -0700 On Friday, August 24, 2018 at 10:35:43 PM UTC-7, Fox's Mercantile wrote: > > forming gradually over 24hrs before installing? > Reforming is a fool's game. > They either work to being with or they're bad. That's not ny experience; yes, I might toss the 40--year-olds, but only because new ones are cheap and probably better performing. Even one-year-old capacitors can benefit from reforming, though, and for some uses (timing capacitors) it's beneficial. It doesn't take 24 hours, though: with a current-limited supply, just give 'em 150% of the rated voltage and warm 'em with a hair dryer for a few minutes, while watching the leakage current. You can see it drop from milliamps to microamps. |
| Fox's Mercantile <jdangus@att.net>: Sep 02 06:03AM -0500 On 9/2/18 3:15 AM, whit3rd wrote: > give 'em 150% of the rated voltage and warm 'em with a hair > dryer for a few minutes, while watching the leakage current. > You can see it drop from milliamps to microamps. That's not how manufacturing does it. Their installed and at the end of assembly line, full power is applied. They either work or they don't. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| Stephen Wolstenholme <steve@easynn.com>: Sep 02 12:45PM +0100 On Sun, 2 Sep 2018 06:03:04 -0500, Fox's Mercantile <jdangus@att.net> wrote: >That's not how manufacturing does it. >Their installed and at the end of assembly line, full power is applied. >They either work or they don't. I remember when part of my job was fixing power supplies. Some that failed the automatic part of the test last thing on one day would work the day after. I never found out why that happened but I assumed it was an electrolytic so I changed the lot. Steve -- http://www.npsnn.com |
| hesterholt6@gmail.com: Sep 01 08:33PM -0700 On Sunday, August 12, 2018 at 5:28:25 AM UTC+2, skyusbook wrote: > Aircraft Structures for Engineering Students (4th Ed., T.H.G. Megson) > Introduction to Programming Using Visual Basic 2008 (w/VS2008 DVD), An, 7/E David I. Schneider > [ South-Western Federal Taxation 2012 - Corporations, Partnerships, Estates and Trusts, 35th Ed by Hoffm... Solutions Manual Calculus Early Transcendental Functions 6th Edition by Larson, Edwards |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Sep 01 06:46PM -0400 On 08/30/2018 07:33 AM, John-Del wrote: > You should contact the OP directly. There's a small possibility that > 1) he's not monitoring this group after 20 years and 2) he may not > have waited 20 years to scrap that antique. You just have the attention span of a goldfish, is all. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
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