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Wax covered capacitors from the 1950s
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nesesu
electronics forum beginner


Joined: 29 Jun 2005
Posts: 5

PostPosted: Tue Jul 18, 2006 4:59 pm    Post subject: Re: Wax covered capacitors from the 1950s Reply with quote

Actually, I usually paint them with the BED colour code after bending
the leads at a sharp right angle and adding some epoxy on each end to
give the 'dogbone' radial leaded shape.
[BED= Body-End-Dot coding that was common just before the colourbanding
became common.]

Neil S.

n cook wrote:
Quote:
nesesu <neil_sutcliffe@telus.net> wrote in message
news:1153194164.132231.183210@h48g2000cwc.googlegroups.com...
Fred, if you are interested, I can send a series of photos showing the
process I use in restuffing old cardboard cased paper caps and a new
process I use to make brand new cardboard cases, since I am running out
of old cap cases in some sizes, to restuff.
It is really annoying when recapping a worthwhile set to find that 3 or
4 original cardboard cased caps have been replaced with plastic or
ceramic cased replacements that are bad, but cannot easily be cleaned
out for restuffing and are, in any case, non-OEM, so I developed a
simple method of making new shells of any regular size.

Neil S.

Fred McKenzie wrote:
In article <e9fjpn$99i$1@inews.gazeta.pl>, "n cook" <diverse8@gazeta.pl
wrote:

Proudly stating "British Made"
What makes all those yellow tubular wax covered caps, Dubilier type
460, TCC
type 343, 645 etc 300V to 750V caps in range 1 to 100nF go so leaky ?
Is it
the wax is actually hygroscopic and absorbs water vapour over time. ?
On DVM resistance scale in Meg ohms but on a Megger then as low as
50Kohm.

N. Cook-

Neil pegged it. It isn't the wax that is hygroscopic as much as the
paper
used as a dielectric in such capacitors made until the late 50s.

As a teenager, I had collected boxes of components by canibalizing
equipment from a local Radio-TV repairman's trash bin. When I saved up
enough money to buy a multimeter, I found that over 90 percent of the
paper capacitors were leaky, and may have been the cause of the
equipment
failure. I learned quickly that the first step in repairing old radios,
was to replace all the paper capacitors.

Somewhere around 1957, the capacitor companys started using plastic
dielectric, sometimes in combination with paper. Names like "Mylar",
"Dipped Mylar" and "Paper-Mylar" were used to describe these newer
capacitors. From my viewpoint, that marked a turning point in the
reliability of electronic circuits.

I understand that some people who restore antique radios, will use the
case of a paper capacitor, replace the core with a mylar capacitor and
seal it again with wax.

Fred


I suppose there is a cottage industry of taking modern 0.5,1,2W metal oxide
resistors, molding in a fire cement wrapper and then painting with
resistance colour-code bands.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
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John Goller, k9uwa
electronics forum beginner


Joined: 18 Jul 2006
Posts: 1

PostPosted: Tue Jul 18, 2006 5:11 pm    Post subject: Re: Wax covered capacitors from the 1950s Reply with quote

In article <HRTug.55246$8W2.787626@wagner.videotron.net>, personne@perdu.com
says...
Quote:




Syl


Yo Syl ... what happened to your website?.. went to look at your bit about

making new old resistors.. the tech stuff won't work on the site..

John k9uwa
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Stephanie Weil
electronics forum beginner


Joined: 17 Jul 2006
Posts: 2

PostPosted: Tue Jul 18, 2006 6:33 pm    Post subject: Re: Wax covered capacitors from the 1950s Reply with quote

Quote:
n cook wrote:
I suppose there is a cottage industry of taking modern 0.5,1,2W metal oxide
resistors, molding in a fire cement wrapper and then painting with
resistance colour-code bands.


Our own Syl Vanier did that. I saw the procedure documented on his
homepage.

That right there convinced me he had totally lost his mind. ;)

--
Stephanie Weil
New York City, USA
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Syl
electronics forum beginner


Joined: 17 Jul 2006
Posts: 2

PostPosted: Tue Jul 18, 2006 8:20 pm    Post subject: Re: Wax covered capacitors from the 1950s Reply with quote

"John Goller, k9uwa" <k9uwaREMOVE@THISarrl.netSTUFF> wrote in message
news:aD8vg.41563$FQ1.6385@attbi_s71...
Quote:
In article <HRTug.55246$8W2.787626@wagner.videotron.net>,
personne@perdu.com
says...




Syl


Yo Syl ... what happened to your website?.. went to look at your bit about
making new old resistors.. the tech stuff won't work on the site..

John k9uwa


Hi John,

Restructuring the website. Will be done in a few dayz. You can still access
the
previous interface here: http://www.oldradioz.com/old_index.html

Syl
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Google

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