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=8165
4CX250B=7203 Amperex used in Eimac box as-is
4CX250B=7203 RCA open box 1971
