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

[Geoff]

NOS has always meant New Old Stock in more than just moldy old radios.
Thats fact so try another assumption for your view of reality.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <boatanchors at mailman.qth.net>
Sent: Friday, May 04, 2012 2:38 PM
Subject: Re: [Boatanchors] [BoatAnchors] "NOS" Caps: Don't 
Trust'em;Check'um!


> Amen to current production Polyester film caps being bad right out of
> the package.
> I test even new ones that I go buy.  Manufacturing errors occur.  The
> manufacturer's test only a sample.
> That is a reality check.
>
> My $60 Ideal DMM test capacitors for value, and I also test for 
> continuity.
>
> THEN they get used.
>
> Unfortunately people assume NOS means old stuff, never opened or used.
>
> We all know what ASSUME means.
>
> Bob - N0DGN
>
> On 5/4/2012 1:58 PM, David Stinson wrote:
>> 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
>>
>>
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