Quote Originally Posted by blackraven
Russia was still using tubes in their high performance Fulcrum jet fighters in the 1990's and may still be.
And are light years behind the technology found in the F-22 Raptor. The 6C33 triodes used by Russian fighters in their radar systems, however, work quite well as amplifiers in a number of amplifiers from BAT, Joule Electra, etc.

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