On Fri, Jul 31, 2015 at 06:43:44PM +0100, Robert Jarratt wrote:
> From the slides you posted it looks like you have some kind of automated set
> up. Can you explain what you have there?
>
The only automation was the data collection. For the reforming I set the
lab supply to the current limit I thin
On 7/31/15 4:48 PM, Eric Smith wrote:
On Fri, Jul 31, 2015 at 5:07 PM, drlegendre . wrote:
I found the hardbound volume in question, and it does have a very
[...]
But happily, I did a little searching and it turns out that the entire doc
is available online via Cornell U and Google books. H
t; -Original Message-
> > From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of David
> > Gesswein
> > Sent: 31 July 2015 02:52
> > To: cct...@classiccmp.org
> > Subject: Re: Reforming capacitors (technical description, not politics)
> >
> > When
On Fri, Jul 31, 2015 at 5:07 PM, drlegendre . wrote:
> I found the hardbound volume in question, and it does have a very
[...]
> 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://babe
> -Original Message-
> From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of David
> Gesswein
> Sent: 31 July 2015 02:52
> To: cct...@classiccmp.org
> Subject: Re: Reforming capacitors (technical description, not politics)
>
> When I reformed the 196
Time to reform is to a first approximation proportional to the rated
capacitance, rated voltage, and the length of time that the capacitor has
been unpowered. However, there is still a lot of variation. I've had a few
40-year-old capacitors (unused for at least 30 years) that took less than
two hou
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
On Wed, 29 Jul 2015, Charles Dickman wrote:
On Wed, Jul 29, 2015 at 3:34 AM, Eric Smith wrote:
Some people seem to think that "reforming" an aluminum electrolytic
capacitor is some kind of cheat, akin to zapping NiCd cells or
rejuvenating CRTs. Actually reforming is the same electrochemical
On Wed, 29 Jul 2015, drlegendre . wrote:
On Wed, Jul 29, 2015 at 5:19 PM, Fred Cisin wrote:
On Wed, 29 Jul 2015, drlegendre . wrote:
Incidentally, what exactly differentiates a computer-grade cap from
any other alum. electrolytic?
Maybe computer-grade don't need gold-plated oxygen-free lead
On Wed, Jul 29, 2015 at 08:58:08PM -0500, drlegendre . wrote:
> I get the jab you're taking at latter-day Audiophool idiocy, but you won't
> find any gold-plated OFC business in any of the vintage gear I typically
> work with.
>
> But as far as gold plating goes, gold is a good conductor, it solde
At 4:10 PM 7/29/2015, drlegendre wrote:
>... I have somewhere a document from Mallory ... that describes the evolution
>of the multi-section aluminum can electrolytic ...
And at 09:43 PM 7/29/2015, Eric Smith wrote:
>Definitely *very* interested.
As am I. I have quite a bit of old Mallory lite
On Wed, Jul 29, 2015 at 03:26:00PM -0700, Ian McLaughlin wrote:
>
> > On Jul 29, 2015, at 3:10 PM, drlegendre . wrote:
> >
> > Parts that were once the size
> > of a Chicago bratwurst are reduced to the size of the baby gherkins that
> > garnish them
>
> Descriptions like these are why I love t
And what a hijack.. sorry. Please just disregard that last post, in the
context of this thread..
We're all much better off exploring the original topic, which is far more
useful and interesting.
On Wed, Jul 29, 2015 at 8:58 PM, drlegendre . wrote:
> I get the jab you're taking at latter-day Aud
I get the jab you're taking at latter-day Audiophool idiocy, but you won't
find any gold-plated OFC business in any of the vintage gear I typically
work with.
But as far as gold plating goes, gold is a good conductor, it solders very
well, it doesn't tarnish and its ductility promotes solid connec
On Wed, Jul 29, 2015 at 4:10 PM, drlegendre . wrote:
> If you're interested, I have somewhere a document from Mallory - I believe
> it may be a hardbound volume, perhaps a catalog - that describes the
> evolution of the multi-section aluminum can electrolytic, from the early
> versions up through
My understanding is that computer grade capacitors
have higher leakage currents than similar sized non-computer
grade capacitors.
When reforming capacitors watch the current going into
the capacitor. The forming process causes outgassing.
If you excess the amount that the burst seal can handle,
eve
On Wed, Jul 29, 2015 at 3:34 AM, Eric Smith wrote:
> Some people seem to think that "reforming" an aluminum electrolytic
> capacitor is some kind of cheat, akin to zapping NiCd cells or
> rejuvenating CRTs. Actually reforming is the same electrochemical
>
Reforming is standard practice with
On 07/29/2015 03:39 PM, ben wrote:
I would guess ripple current.
You got me there--in particular, I've had terrible luck with Sprague
"Long Life Hermetically Sealed" screw-terminal caps. Just about every
single one I've run into has been bone dry. Useless to try to reform
those. Lambda
On 7/29/2015 4:10 PM, drlegendre . wrote:
Capacitor technology made huge strides in the 1960s and 1970s - and has
continued to advance even to this very day. Parts that were once the size
of a Chicago bratwurst are reduced to the size of the baby gherkins that
garnish them, with better specs acro
> On Jul 29, 2015, at 3:10 PM, drlegendre . wrote:
>
> Parts that were once the size
> of a Chicago bratwurst are reduced to the size of the baby gherkins that
> garnish them
Descriptions like these are why I love this mailing list.
Ian
On Wed, 29 Jul 2015, drlegendre . wrote:
Incidentally, what exactly differentiates a computer-grade cap from any
other alum. electrolytic?
Maybe computer-grade don't need gold-plated oxygen-free leads?
Capacitor technology made huge strides in the 1960s and 1970s - and has
continued to advance even to this very day. Parts that were once the size
of a Chicago bratwurst are reduced to the size of the baby gherkins that
garnish them, with better specs across the board. And if you want to count
the "
On Wed, Jul 29, 2015 at 11:27 AM, drlegendre . wrote:
> And therein lies the rub. It seems that so many of the 'legacy' caps we
> come across already have some degree of irreversible damage, that the idea
> of reforming them appears to be some type of dark art.
As someone else pointed out earlier
Hi Eric,
Excellent article.
On Wed, Jul 29, 2015 at 2:34 AM, Eric Smith wrote:
> Some people seem to think that "reforming" an aluminum electrolytic
> capacitor is some kind of cheat, akin to zapping NiCd cells or
> rejuvenating CRTs.
>
(...)
>
> The reforming process WILL NOT fix other thin
Better explanation than mine.
Eric Smith wrote:
>Some people seem to think that "reforming" an aluminum electrolytic
>capacitor is some kind of cheat, akin to zapping NiCd cells or
>rejuvenating CRTs. Actually reforming is the same electrochemical
>process that the manufacturer uses to "form" th
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