[Milsurplus] Submini tubes.

[Glenn Little WB4UIV]

The sub-minis were also used in the guidance electronics in ate least one 
of our electric propelled torpedoes. The B+ was obtained from a dynamotor. 
I was kinda shocked when I saw this technology still in use in the 1980's.

73
Glenn
WB4UIV

At 12:24 AM 01/04/06, Kenneth G. Gordon wrote:
>Hue Miller
>
> > What features of submini tubes account for their ( apparently,
> > according to testimonials here ) long life?
> > Tnx-  Huey Miller
>
>According to Sylvania, they were purposely designed and built to be as
>rugged and long-lived as possible, 40,000 hours being a median life-
>span for some selected types.
>
>Although I have not studied their construction very closely, I DO know
>that their small mass makes it more difficult for them to be damaged by
>vibration.
>
>A friend of mine, Walter Wallace, who lived near Billings, Montana
>recounted when he worked for some gummint agency selecting tubes to
>be used in proximity fuses, which were in development at that time. He
>tested the tubes given to him for ruggedness by shooting at them with a
>.22 rifle. Those that survived that, were tested further. Some were
>eventually selected for the circuit. ALL were submins.
>
>At the time he told me this story, about 1970 or so, I thought his
>methods were a bit extreme. Now I'm not so sure.
>
>Ken W7EKB
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