Geoff Reed wrote:
doing some quick googling, many of the sites that had
info on Apple III power
supply repairs talked about a failing electrolytic cap, although the package on
the one i found with pics didn't look like any electrolytic I had looked at.
http://www.applefritter.com/node/20378 scroll down towards the bottom of the page.
It's neither electrolytic or 22uF (seemingly, the European comma decimal point
is confusing the writer), and it didn't fail by 'drying out' as the writer
writes. It's 0.22 uF and (probably) mylar or polystyrene, and a replacement
should be 'line-rated' as it's somewhat obviously part of the line filter.
The
writer seems to have gotten the replacement about right regardless (?).
I'd actually expect the electrolytics to be
getting dodgey after 20+ years.
I expect many will differ in opinion, but I don't worry much about 'modern'
(60's and
later) electrolytic caps. Very roughly speaking, my assessment for 'lytics
tends along the lines:
- industrial quality equipment pre late-50s: worry
- " " " post late-50s: don't worry
- consumer-quality equipment pre late-60s: worry
- " " " post late-60s: don't worry
with some gray areas in between, etc.
Maybe it's the climate around here (mild) but other than early tube equipment
and the occassional leaking one (and the well-known manufacturing problems in
the mid/late-90's), I don't often have problems from electrolytics; or to put
it another way, I'm of the feeling the concern over electrolytics is overstated.
To put it more concisely perhaps, I think the well-justified
concern/experience with early 'lytics has carried too far over to more modern
equipment/components.