I've just "brought back" two Sols. I did not find either power supply in need of capacitor reforming. I brought each power supply up on a variac, powering a dummy load (multiple 1 ohm, 10 watt, resistors). I brought up the variac over the course of an hour, checking each stage of the supply. All smooth as glass. I then let the supply drive the dummy load for a day, checking regularly. No problems. The only issue was that all of the unregulated S-100 supplies were out of spec. This turns out to be a design issue, with a specific engineering note to address it (adding a bucking transformer) which I applied. Hope this helps, Bill S. -----Original Message----- From: vcf-midatlantic [mailto:vcf-midatlantic-bounces@lists.vcfed.org] On Behalf Of Mike Loewen via vcf-midatlantic Sent: Saturday, December 07, 2019 12:12 AM To: vcf-midatlantic@lists.vcfed.org Cc: Mike Loewen Subject: [vcf-midatlantic] Reforming capacitors 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/