[Hallicrafters] Dur-Paper

[Art Lebermann]

Joe....
I took another look at the catalog listings for 1957 and 1963.  The most
common types of disk ceramic capacitors were not available in values above
.01 mfd.  The few that were available in higher values were either much
more expensive, or had very wide tolerance ranges.  I'd say that this
explains the use of "paper" capacitors for the .1 mfd and .047 mfd values.

ART
W6REQ



> [Original Message]
> From: carolew <carolew at bellatlantic.net>
> To: <artleb at earthlink.net>
> Cc: pete wokoun, sr. <pwokoun at hotmail.com>;
<Hallicrafters at mailman.qth.net>
> Date: 11/14/2005 4:35:46 AM
> Subject: Re: [Hallicrafters] Dur-Paper
>
> 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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