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4-125A=4D21 Eimac used sold as-is good filament
4-125A=GL-4D21 GE NOS original box 1960's sold as-is
4-250A=5D22 RCA 1962 used original box sold as-is (good filament)
4-400A=8438 Eimac
4-65A RCA NOS 1955
4-65A=8165
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)
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)
42 RCA used/good 1940's (27.2ma)
42 Sylvania engraved used good 1940's (30ma)
42 Tungsol used/good 1940's (27ma)
42 Tungsol used/good 1940's (30ma)
42 Tungsol used/good 1940's faded printing (33ma)
4212E=212E STC England
421A Western Electric NOS 1984 (read review)
42KN6 Sylvania branded Raytheon NOS
