31 Jul
2015
31 Jul
'15
4:07 p.m.
@Eric & others
Good news, everyone. ;-)
I found the hardbound volume in question, and it does have a very
interesting and detailed discussion of aluminum electrolytics, and the
Mallory FP series in particular. But my memory is a little hazy, and I'm
not sure this is the +exact+ article I had in mind when I raised the
subject. It may be, but I remain somewhat unsure.
But happily, I did a little searching and it turns out that the entire doc
is available online via Cornell U and Google books. How cool!
Here's the link: http://babel.hathitrust.org/cgi/pt?id=coo.31924004669861
Take a look at Section 9 for the primary capacitor articles. Meanwhile,
I'll keep my eye out for any other docs, I have a hunch there's another one
in the "library"..
On Fri, Jul 31, 2015 at 12:43 PM, Robert Jarratt <
robert.jarratt at ntlworld.com> wrote:
-----Original
Message-----
From: cctech [mailto:cctech-bounces at classiccmp.org] On Behalf Of David
Gesswein
Sent: 31 July 2015 02:52
To: cctech at classiccmp.org
Subject: Re: Reforming capacitors (technical description, not politics)
When I reformed the 1967? capacitors in MARCH's straight 8 I took some
data
showing the improvement in leakage and also
measured capacitance and ESR.
I
couldn't find original spec for the capacitor
but the values seemed
reasonable
compared to datasheet for more recent
capacitors.
Graphs here.
http://www.pdp8online.com/shows/vcfe15/slides/PDP-8_Restoration.html
David,
From the slides you posted it looks like you have some kind of automated
set
up. Can you explain what you have there? The limited reforming I have done
has been done manually. I also notice that you reform over quite a few
hours, but those are big caps. Not sure I have seen any suggestions over
how
long to reform for, and whether it is a function of the capacitor's nominal
capacitance.
Thanks
Rob