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4C35 Kuthe Labs made for Marconi NOS 1951 (1 in stock)
4C35 Sylvania Hydrogen Thyratron NOS (1 in stock)
4CX250B=7203 Amperex used in Eimac box as-is
4CX250B=7203 RCA open box 1971
4CX250K=8245 Eimac like new 1963 was hermetically sealed (similar to 8172)
4CX250K=8245 Eimac NOS 1960's hermetically sealed (6 in stock) (similar to 8172)
4D22 Raytheon display tube
4E27 Gammatron used 1940's good filament
4E27 Lewis and Kaufamn NOS original boxes 1950's (3 in stock)
4E27 RCA used 1950 good filament
4PR60C=8252 Eimac PULSE TETRODE NOS
4X150A=RCA NOS 1970 sold as-is
50A5 US Brands NOS (2 in stock)
50B5 RCA branded Raytheon NOS 1950's (64/45)
50B5 RCA NOS 1958 (64/45)
50B5 RCA tilted glass NOS (68/45)
50B5 RCA used/good 1950's (63/45)
50B5 RCA used/good 1950's (64/45)
50B5 Tungsol NOS 1956 (76/45)
50B5 used/good (1 in stock)
