8 Sep
2019
8 Sep
'19
6:38 p.m.
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 at classiccmp.org> wrote:
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
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