[Milsurplus] Weird little tube - where was it used?

[david_jackson at agilent.com]

Dave:

If I recall correctly, it is also used in the Radiosondes of the 1950s.  I bought one from Meshna or Fair Radio in the 60s and there was one inside a silver plated cavity.

Sincerely,
 
Dave WA4OBJ


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From: David Ross <ross at hypertools.com>
I have come up with an RCA 5675 tube.  The data sheet describes it as a 
medium-mu triode  'for cathode-drive applications'.  Rated at full input 
at 1700 Mc, altitudes up to 100,000 feet.

Interesting specs -  does anyone know where this tube was used?

thanks
Dave Ross    N7EPI