Reforming capacitors (technical description, not politics)

[drlegendre .]

@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
>
>