Testing New Old Stock electrolytic caps - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Parts

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
Reply
 
Thread Tools Search this Thread
Old 2nd April 2013, 05:55 PM   #11
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
I see very little trouble with caps that are 15 years old. At 30 years many will have rising dissipation factors, high or low values and chemical leakage. High voltage caps seem to do poorly on the shelf and old ones are always suspect. I've reformed a lot of caps and though they sometimes do OK for a while, by the time they need reforming they usually just need replacing.

With regular use, at moderate temperatures and in a good conservative design, decent caps will last far longer than most people give them credit for. Subjected to heat, storage, ozone and chlorinated solvents you might be doing well to get a couple years.

IMO, if you check value, dissipation factor, DC leakage at rated voltage and physical appearance (corrosion/leakage) you can be pretty certain of at least another decade of good performance. Note that a higher than rated value is often a bad thing. It seems to happen with age and the condition is going downhill rapidly at that point. If you can't measure those things on a bridge than it's a complete crap shoot and replacement is the best option.

I have plans for a simple cap bridge for value and loss on my site that you can throw together for very little if you have decent junk parts box. Not much more if you don't.
__________________
I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote
Old 5th April 2013, 11:55 AM   #12
diyAudio Member
 
Join Date: Aug 2005
Location: Aveyron
Conrad,
you should'nt have upset the Little Black Eagle people - seriously you post makes lots of sense.

I bought more of the sought after Evox-Rifa and Philips LL caps than I needed about 11 years ago, they are now NOS and want to use some in modding the PSU in an amp.

It's a shame that caps are'nt like valves that sit around for years with no loss of performance - esta la vida.
__________________
Black Stuart
  Reply With Quote

Reply


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
paralleling film caps with electrolytic caps jarthel Power Supplies 399 14th September 2014 10:33 PM
Testing aluminum electrolytic caps Conrad Hoffman Parts 25 12th January 2012 11:45 AM
whats the best way of testing electrolytic capacitors using a multimeter? mrsmith Solid State 19 9th November 2005 09:33 AM
testing electrolytic capacitors using a multimeter? mrsmith Parts 3 22nd October 2005 07:10 PM
Electrolytic Cap Testing Giaime Parts 12 31st May 2005 10:42 PM


New To Site? Need Help?

All times are GMT. The time now is 08:18 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2