Hivac valve amplifier

Discussion in 'General Electronics Chat' started by recklessrog, Nov 25, 2017.

  1. recklessrog

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    Out of interest, has anyone else had experience of a valve (tube) op amp module that used 5 sub miniature valves (pentodes I think) that had a covering of silvered paint? They were directly heated and made by Hivac. I came across them in the late 60's used in experimental missile systems.I remember that they apparently cost a small fortune and were extremely robust for the technology, we had to put them through severe vibration, temperature and humidity cycles before they were accepted for use.
     
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  3. recklessrog

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  5. recklessrog

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