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3Q5GT Philco used/tests like new 1940's (96/60)
3Q5GT Tungsol NOS (101/60)
3Q5GT=VT-221 Ken Rad used/tests like new 1940's (106/60)
3Q5GT=VT-221 Tungsol used/tests like new 1940's (105/60)
3V4 GE Motorola used/strong 1960 era (92/60)
4-125A=4D21 Eimac used sold as-is good filament
4-125A=GL-4D21 GE NOS original box 1960 sold as-is
4-250A=5D22 RCA 1962 used original box sold as-is 1962 (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)
