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My method for reforming electrolytics is to use a low current high voltage supply and place a 10K resistor in series with the cap being reformed. I monitor the voltage across the cap which will slowly rise if the cap is a good candidate. I'll monitor the voltage as it rises to the cap's rated voltage then remove and gently discharge the cap and reconnect to the test rig. If the cap is decent it will much more quickly charge to it's rated voltage the second and subsequent times. Interestingly if the process is stopped before the cap reaches it's rated voltage, discharged and reconnected to the rig it will quickly rise to the voltage it got to when it was disconnected and then proceed slowly to it's rated voltage, sort of behaving like a zener diode! I have a 1956 B&W PYE set I've restored and managed to reform all of the multi electrolytic cans. The set has done countless hours with these but it is only used by me. If I was restoring it for someone else I would definitely re stuff the can's. I still have a healthy disrespect of all old electrolytics.
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06-28-2020, 12:46 AM
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