[Hallicrafters] Dur-Paper

[carolew]

Art, I haven't examined them yet. I have to finish another one before I start
the HQ-180. What surprises me is that any company would use paper caps that
late in the game. I thought that by the time the HQ-180 was made, all the
SW/ham companies had switched to ceramic disk. What is interesting is that only
the largest caps (0.1 mfd and 0.047 mfd) are dur-paper. Perhaps there was a
problem with ceramic disks in those larger values.

Joe Connor

Art Lebermann wrote:

> Joe...
> I checked the capacitor listings in the "Radio-Electronic Master" catalogs
> for 1957 and 1963.  I did not find any "Dur-Paper" capacitors.  However - I
> did find "Dur-Mica" (silver mica) capacitors by Arco-Elmenco.  I'd guess
> that Elmenco also made the "Dur-Paper" caps?  Have you examined the actual
> parts?
>
> Art Lebermann
> W6REQ
>
> > [Original Message]
> > From: carolew <carolew at bellatlantic.net>
> > To: pete wokoun, sr. <pwokoun at hotmail.com>
> > Cc: <Hallicrafters at mailman.qth.net>
> > Date: 11/13/2005 6:33:20 PM
> > Subject: [Hallicrafters] Dur-Paper
> >
> > Has anyone heard of a type of capacitor called a Dur-Paper capacitor? I
> just got
> > a Hammarlund (heresy, heresy) HQ-180 and it has several dur-paper caps in
> values
> > of 0.1 mfd and 0.047 mfd. Once I get around to working on it, I will
> replace
> > them as I would any other paper caps. However, when I saw the dur-paper
> > designation in the parts list, I got curious. I ran a Yahoo search but
> came up
> > with nothing.
> >
> > Joe Connor
> >
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