Looking at the tubes available, it’s clear that if you are searching for an obscure 1050s small-signal RF tube you’ll be out of luck; these are mostly audio amplifier parts, double triodes ...
Instead it’s a small-signal VHF amplifier, a rough equivalent of the ... so it is with an RF tube. There is no reason a 6J1 won’t do an acceptable job in a circuit such as this one.
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