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(!!) (Recommended Pair) 80 GE GT-shape NOS 1960 (56/40 and 62/40 x 2 tubes)
(!!) (Recommended Single) 5Y3GT Hytron NOS 1951 (56/40 and 60/40)
(!!) (Recommended Single) 6106 Bendix rebranded 5Y3WGTA Heintz & Kaufman NOS (66/40 and 70/40)
(!!) (Single) 5U4GA GE "D" getter used/good 1954 (51/40 and 52/50)
(!!) (Single) 5U4GA GE "D" getter used/tests like new 1955 few small scrapes on base (58/40 and 59/50)
(!!) (Single) 5U4GA GE GM Delco "D" getter used/tests like new 1950's (54/40 and 55/50)
(!!) 5R4GYA GE brown base NOS 1972 (52/40 and 54/40)
(!!) 5R4GYA GE Hewlett Packard brown base "D" getter halo NOS 1959 (51/40 and 52/40)
(!!) 5R4GYB RCA rebranded Raytheon NOS 1960's (50/40 and 53/40)
(!!) 5Z3G Sylvania NOS 1950 (56/40 and 58/40)
(!!) 80 Fapesa Miniwatt Argentina NOS 1950's faded printing (52/40 and 56/40)
(!!) EZ35=6X5GT Mullard UK used/tests like new 1950-1955 small crack in base (52/40 and 57/40)
(!) (BEST GZ32 SINGLE) GZ32 Miniwatt Dario France NOS around 1955 (61/40 and 62/40) very small rattle inside base
(!) (Best Pair #1) 5726=6AL5W Raytheon NOS 1960's (49-50/40 and 49-50/40)
(!) (Best Pair #2) 5726=6AL5W Raytheon NOS 1960's (48-48/40 and 48-48/40)
(!) (BEST PAIR #2) 6663=6AL5 GE NOS 1962-1965 (46-46/40 and 47-48/40) (Copy)
(!) (BEST PAIR) 6663=6AL5 GE NOS 1963-1964 (47-47/40 and 47-48/40)
(!) (BEST PAIR) 6AL5 GE NOS 1960's (48-48/40 and 48-50/40)
(!) (BEST PAIR) 6CA4 RCA NOS 1960's - 1972 (54-56/40 and 54-54/40) (Wright, Counterpoint, Cary, Zanden)
(!) (BEST PAIR) 6CA4=EZ81 Sylvania NOS 1960's (53-54/40 and 52-53/40)
