[Milsurplus] [RCA] SRR-13 Article, more

[Glenn Little WB4UIV]

On 8/2/2016 12:41 PM, Hubert Miller wrote:
> I don’t think it’s correct to give a blanket assessment of submini tube
> longevity. The proximity fuze tubes WERE built to
>
> withstand extreme G forces, but i really doubt the run of the mill
> portable radio tubes were anywhere near the same
>
> kind of standards. Some of the submini tubes ( 5676 comes to mind ) were
> actually rated for 100 hours life. Which
>
> reminds me, i have a grid-dip meter that uses this tube; maybe i should
> be thinking about an FET replacement, which
>
> would also eliminate the 67.5 volt battery.
>
>
>
> BTW – one fellow on the regen receivers group built a small regen
> receiver using proximity fuze tubes he had on hand,
>
> and reported the tubes’ performance seemed to degrade in a short time,
> in hours. This is only anecdotal, but i wonder.
>
>
>
> The SRR-13 doesn’t have any kind of cooling provisions, is that correct?
>
> Which reminds me, i have somewhere one of those Navy SSB low-power
> exciter / receivers that was notorious for
>
> failures due to, i believe, tight packaging and cooling. Another item
> whose disposition i need to decide.

This would be a AN/URC-35. Almost guaranteed to fail within 100 hours if 
used as built

Glenn
WB4UIV
>
> -H
>
>
>
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-- 
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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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