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4-250A=5D22 RCA 1962 used original box sold as-is (good filament)
4-400A=8438 Eimac
4-65A=8165
40 NOS
401A Western Electric
407A Sylvania branded RCA gold pins used/good 1971
407A Sylvania branded RCA NOS 1977
407A Sylvania gold pins used/good 1960's
407A Westinghouse Canada NOS 1960's
40KG6A=PL519 JAPAN branded RCA tall bottle clear top NOS (1 in stock)
41 Philco engraved base used/good 1930's (72/40)
41 Sylvania Philco NOS 1952 (75/40)
41 Triad engraved base used/strong 1930's (70/40)
41 US Brands used/good (40 in stock)
413A Western Electric NOS (sold out)
413B Western Electric NOS 1963
413B Western Electric NOS 1967 cracks in paint
42 National Union like new 1950 era (29.5ma) (Gm like new)
42 Philco engraved base used/very good 1930's (32.5ma)
42 Philco used/good 1940's (30.8ma)
