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Is it a spec or not?? Federal aviation Administration.
The FAA does not spec the tubes per se any more than they spec the capacitors. The FAA specs the radios. So what the FAA specs is noise and distortion, reliability, that sort of thing (performance) and it's up to the vendor to use the tubes that ensures that the radios meet spec.
FAA is not a spec.
Looks like unclestu disagrees with you??
This ain't a pissing contest. We all are simply trying to get to the truth.
geoffkait's picture showa a coin-base 6SN7. Those were made later, after the JAN tubes came about. JAN tubes go back to the WWII era.
The FAA is a civilian agency the last time I looked. ;-)
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