Re: Nostalgia? Probably.
You certainly can still buy valve amateur-radio gear (though not usually as kits: the health&safety/legal-liability guys are rightfully reluctant about letting people self-assemble a HF linear-amp using a 2.5Kv@1A power supply)
3-500Z, 3CX1500 and 572B valves are still popular in such applications. CPII [the company which now owns Eimac] are still making these valves!
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