I used 5mA without resistor. My supply current limiting wasn't too stable that low so I readjusted periodically. I think 5mA was the worst case number I saw. Most references used higher current. Lower current will just make it take longer. I reformed to the rated voltage. I let it go till the current stopped decreasing. Info starting with this slide http://www.pdp8online.com/shows/vcfe15/slides/img9.html And a little more on mine where I did reject a couple when leakage didn't drop sufficiently. http://www.pdp8online.com/straight8/ps_restore.shtml On Sat, Dec 07, 2019 at 12:11:34AM -0500, Mike Loewen via vcf-midatlantic wrote:
Before I reform the large electrolytics in my Sol 20, I'd like to poll the collective as to the recommended procedure. I have a constant voltage/constant current DC supply, so I can set voltage and current limits. For those of you who have done this, what's your procedure?
For a constant voltage/constant current supply, do you need a resistor in series with the cap? If so, typical value?
What's the recommended max current during the reforming process? I've seen recommendations of 50ma and 100ma.
What percentage of the working voltage do you initially take it to? How much do you raise it after the current drops? How long do you let it sit at each stage?
I'm interested in hearing from folks who have actually done this, with a constant voltage/constant current supply. Thanks for your input!
Mike Loewen mloewen@cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/