[Milsurplus] Submini tubes.

[ersmar at comcast.net]

Gents:

     For a good book on the developer of the proximity fuse and his role in RADAR and the Manhattan Project (including of arming Little Boy in the dark, frigid, cramped bombay of the Enola Gay) read: Target Hiroshima: Deak Parsons and the Creation of the Atomic Bomb by Al Christman.  http://www.amazon.com/gp/product/1557501203/102-1190518-4992149?v=glance&n=283155 .  A fascinating read for all us history buffs.

73 de
Gene Smar  AD3F


 -------------- Original message ----------------------
From: "Kenneth G. Gordon" <kgordon at moscow.com>
> 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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