Re: Question about Pyramid caps

"Jon Yaeger" <jono_1@[EMAIL PROTECTED]
> wrote in message
news:C447FDBC.BDE47%jono_1@[EMAIL PROTECTED]
> I'm restoring a 40+ year old Scott preamplifier.
>
> How well do the Pyramid brand plastic-encapsulated paper / foil caps
hold
up
> over time, in terms of leakage?  Is it necessary to replace them
wholesale?

Hi Jon:  I would.  I acquired a large selection of NOS paper caps a few
years ago.  I recall that almost everything except the Sprague Orange
Drops,
Solid Impregnant Black Beauties, and Arco Brown  Radials (Chocolate
drops?)
leaked.  The impregnants are all proprietary and most failed, even some
hermetically sealed caps.  Some of the military metal can caps are OK.  I
recall that Westcap metal can are OK. Of course the Vit-Q is fine. I have
two 0-400V d.c. power supplies to series for some serious testing.  The
Orange drops (paper/mylar until about 1980 when they became SBE) and Arco
radials have far less leakage at 150% of rated voltage than at 100%.
Despite what the scientific crowd says, the vintage paper caps can give
the
circuit a uinique and in my opinion pleasing sound.  I am in the process
of
setting up a website to sell parts.  www.33audio.com.  Some of the pages
are
uploaded.  I have some 400V Arco radials for sale if you need some.  I
have
used these for several years and have never had a problem with them.  Mark
>
> Thanks
>
>
> Jon
>