At 04:54 PM 8/09/2019 -0700, you wrote: >Hi Kyle, > >On Sun, 8 Sep 2019 18:42:06 -0500 >Kyle Owen via cctalk <cctalk@classiccmp.org> wrote: > >> Has anyone replaced the capacitor in a ferroresonant power supply with much >> success? My current understanding is that the capacitor and transformer are >> mated as a pair, so replacing just one of them would require careful >> consideration. >> >> The PDP-8/I I'm working on has a 704A in it, with a GE 8uF 660V capacitor. >> It measures a couple of nF on my capacitor meter, and I was told by the >> previous owner that it's dead. > >We recently replaced the ferroresonant capacitor in a power supply on the CHM's >PDP-1. They do fail (thankfully, not often) - and they are not super-critical >as to value. If the one you're replacing has the same marked value, you should >be fine. > >Cheers, >Lyle >PDP-1 Restoration Team, CHM
Yes, that's right. Find something with the same marked capacitance value. The rated voltage can be the same or higher. Be aware these are non-polarized caps, NOT electrolytics. They are typically paper, foil and oil. Best to find a new replacement, as many old-old oil- insulated caps will contain PCB (polychlorinated biphenyl) oil, which is severely carcinogenic. Banned, and must be disposed of as contaminated waste. Guy
