XPost: rec.radio.shortwave   
   From: pirwin@ktb.net   
      
   In rec.audio.tubes dave  wrote:   
   > On Thu, 17 Nov 2011 07:34:03 +0000, Geoffrey S. Mendelson wrote:   
   >>   
   >> They showed some promise in the missile and space exploration systems of   
   >> the time, because transistors could not stand the temperature extremes   
   >> or cosmic radiation they would be exposed to. That also did not last   
   >> long, as improved "space grade" transistors came out.   
   >>   
   >   
   > Cold Cathode tubes were voltage regulators, displays, etc. I have never   
   > seen a cold cathode amplifier.   
      
   I think the tubes being referred to are field emission triodes and   
   various microwave tubes.  You can certainly make a linear amplifier   
   with field emission devices.   
      
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