best way to recondition Rifa caps after long storage - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th December 2010, 04:13 PM   #1
qusp is offline qusp  Australia
diyAudio Member
qusp's Avatar
Join Date: Oct 2009
Location: Brisbane, Australia
Default best way to recondition Rifa caps after long storage

Hi guys, I have just been given a pile of Rifa PEH169 some 3300u/63v stud mount (about 20) and some 15000u/40v. the 3300 date codes put them at 15 years old, they are unused and appear to be in good nick, but the stated shelf life is 10 years @ 40c, now I know they were kept well packed in a cool but not cold place.

the 15000uf/40v (14 of them) i'm yet to look up the date code (BAO) but these also appear fine and were stored together with the others.

I have many things I would love to do with these great caps, not least build an adjustable supply for testing and an F5X, but I do not want to put myself in jeopardy. there datasheet explains to expose them to close to their rated voltage and about double their leakage current for an hour to recondition them before use, is this a good idea at this point? or should I regretfully dispose of them?

I suppose the words suck it and see come to mind, try the reconditioning thing and if they survive that unscathed, step up the current a bit using them in a fairly undemanding power supply and again if they survive, use them as intended for the next 70000hrs?

your advice and comments are much appreciated it would be a crying shame to throw these away and given they have been stored at 10-20c (probably somewhere 15-20 for the vast majority) well protected and wrapped, i'm probably fine, but thought I would ask just the same

Last edited by qusp; 6th December 2010 at 04:20 PM.
  Reply With Quote
Old 6th December 2010, 04:32 PM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Old electrolytics can often be re-formed successfully. Just do it gradually. The minimum you need to do this is a DC power supply, a resistor and a voltmeter. There is plenty on the web about this, although much of it is aimed at higher voltages. The principle is the same for lower voltages.

If they have dried out or the film has deteriorated too much then they won't reform. Anyway, give it a try - nothing to lose.
  Reply With Quote
Old 6th December 2010, 05:34 PM   #3
qusp is offline qusp  Australia
diyAudio Member
qusp's Avatar
Join Date: Oct 2009
Location: Brisbane, Australia
thanks yeah thats what I figure, seen the stuff on the net, but thought I would ask 'my people' who may have even had experience specific to these very caps. considering the PEH169 is branded and promoted as an 'ultra long life' electrolytic I figure its about as good a candidate as possible. and since they are branded as such and guaranteed to live 70000hrs in use in much harsher environments than i'll put them through after such a period, they probably cover themselves too.

so i'll be doing just as you say and first winding them up slowly with ~50-55vdc (for the 63v) and a few ma from a resistor and take it from there. will then have to come up with a cooker to do them in batches after that. i've used much older NOS caps and blackgates that must be getting on a bit regularly and they arent designed to last forever like these are.

thanks for the advice
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
RIFA PEH169 Caps? peterpan188 Parts 52 2nd April 2014 09:43 PM
Storage Heater Elements. How long do they last ? Any Electricians... Mooly Everything Else 4 13th February 2010 06:29 AM
High Voltage Huge Storage CAPS for that Ultimate Valve Amp col Parts 0 11th December 2009 02:37 AM
where to get RIFA caps in the US? grataku Parts 14 22nd February 2003 04:15 AM

New To Site? Need Help?

All times are GMT. The time now is 09:01 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2