(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (8.3/9.0ma)
(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (9.2/10.2ma)
(!!!) (Recommended single) 12AT7 Brimar UK black plates "O" getter halo copper grid posts NOS 1957 (16.0/15.2ma)
(!!!) (Recommended Single) 12AX7 RCA "tall gray plates" and "D" getter halo branded Raytheon used/good 1950's (Gm=1900/2100) (1.3/1.7ma)
(!!!) (Recommended Single) 5687 Tungsol branded Amperex black plate/bronze-black plate (38ma/43.5ma)
(!!!) (Recommended Single) 5881 Tungsol NOS 1950's branded 6L6GB (86ma)
(!!!) (Recommended Single) 5881 Tungsol rebranded Sylvania 1960 era (77.5ma)
(!!!) (Recommended Single) 5Z3G RCA NOS 1954 (58/40 and 60/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (57/40 and 58/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1971 (56/40 and 58/40)
(!!!) (Recommended Single) 6106 Bendix rebranded 5Y3WGTA Heintz & Kaufman NOS (64/40 and 65/40)
(!!!) (Recommended Single) 6106 Bendix rebranded 5Y3WGTA Heintz & Kaufman NOS (64/40 and 66/40)
(!!!) (Recommended Single) 6SL7GT RCA NOS 1962 (2.5/2.7ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania NOS 1960's (7.2ma and 6.6ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania used/tests like new 1960's (8.2ma and 7.6ma)
(!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (53/40 and 54/40)
(!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (54/40 and 55/40)
(!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (54/40 and 56/40)
(!!!) (Recommended Single) 6X5GT Sylvania Silvertone NOS 1945 (52/40 and 53/40)
(!!!) (Recommended Single) EF94=6AU6 Tungsol used/tests like new 1957 (10ma)
