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6U8A Philips by Sylvania NOS 1980's (10 in stock)
6U8A used/good
6U9 GE Holland NOS 1970's
6V6GT Hytron black plate like new smeared printing 1947 (44ma)
6V6GT RCA BROWN BASE - gray coated glass - used 1951 (35ma)
6W4GT RCA NOS (12 in stock)
6X4 National Union "D" getter halo tests like new 1955 (56/40 and 58/40)
6X4 Philco used/good 1949 (46/40 and 47/40)
6X4 RCA "O" getter used/good 1960's (44/40 and 49/40)
6X4WA GE black plates rebranded National NOS (55/40 and 56/40)
6X5GT GE used/good 1958 (48/40 and 50/40)
6X5GT GE used/good 1960 (47/40 and 48/40)
6X5GT Sylvania chrome top used/good 1956 (47/40 and 50/40)
6X5GT US Brands used/good (10 in stock)
6X5GT US Brands used/good (2 for $12)
6X8 and 6X8A US Brands NOS (40 in stock)
6X8 US Brands used/pullouts/untested/sold as-is no warranty or returns
6X9=ECF200 NOS
6Y6G Arcturus by Tungsol coated glass used/good/70% 1940's (43ma) tested on amplitrex
6Y6G GE 1943 used/good black plate, double filaments, crack in base (56ma) tested on amplitrex
