[Milsurplus] SRR-11/12/13.

[Scott Johnson]

The USAF KC-135's still have an ARN-32 marker beacon receiver installed, 
which is powered up whenever aircraft power is applied.  I have seen 
receivers with all original tubes (judging by the date codes) , these are 
subminiature types, probably with a minimum of 40,000 hours of operation on 
them.  In 24 years, I have only replaced one of these tubes, a 6021.  They 
are indeed reliable!

Scott
----- Original Message ----- 
From: "John Kolb" <jlkolb at jlkolb.cts.com>
To: "Kenneth G. Gordon" <kgordon at moscow.com>; <Milsurplus at mailman.qth.net>
Sent: Tuesday, January 03, 2006 12:16 PM
Subject: Re: [Milsurplus] SRR-11/12/13.


> At 10:18 PM 1/2/2006, Kenneth G. Gordon wrote:
> <snip>
>>As W.Donzelli says, when the submini tubes are treated properly, they
>>are MUCH more reliable than most other tubes.
>>
>>After all, they were used very successfully in proximity fuses for AA
>>shells.
>
> Of course the expected operating lifetime of a proximity fuse is
> minutes, not years  :)
>
> John
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