[Milsurplus] [BoatAnchors] "NOS" Caps: Don't Trust'em; Check'um!

[David Stinson]

Arden said:

> ..... A "NOS" paper cap is no better than one
>wired into a rig at the factory...
I actually agree.
By "NOS," I didn't mean "old originals."
These caps are "new production but unused and surplused"
Polyester Film caps.
Perhaps my definition of "NOS" needs correcting.

As for really "old caps" like Micamolds and paper-
I've thrown-away all the low-voltage ones and
have, after long testing, successfully deployed a few
hi-volters in low-voltage situations.  Some have been
in service without trouble for years.  I remember one failure,
but at 45 volts B+ it did no harm.
The RAAF AR8 receiver has all but one original WWII
black-tar-and-paper cap still in it, running at 90V B+.
I have left it on for 48 straight hours with no issues.
It runs cool and stable.
The AT5 transmitter had the same type caps and
all but one of them was bad beyond hope.
Go figure ;-) and "Each to his own."

73 DE Dave AB5S



----- Original Message ----- 
From: "Arden Allen" <gumbear at pacbell.net>
To: "David Stinson" <arc5 at ix.netcom.com>; 
<milsurplus at mailman.qth.net>; <boatanchors at theporch.com>; 
<boatanchors at mailman.qth.net>
Sent: Friday, May 04, 2012 11:58 AM
Subject: Re: [BoatAnchors] "NOS" Caps: Don't Trust'em; Check'um!