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4B31 Cetron NOS (4 in stock)
4B32 Amperex NOS original boxes sold as-is
4BC5 NOS (20 in stock)
4BQ7A Raytheon Japan NOS (6 in stock)
4BQ7A Raytheon NOS (5 in stock)
4C35 Kuthe Labs made for Marconi 1951 low hours/like new
4C35 Kuthe Labs made for Marconi NOS 1951 (1 in stock)
4C35 Sylvania Hydrogen Thyratron NOS (1 in stock)
4CX1000A
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)
4CX300A=8167
4CX350F=8322 subs = DX362 AMPEREX
4CX400A
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
