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(!!) (Pair) 6AX4GTB Sylvania NOS and like new 1960's (56/40 and 53/40)
(!!) (Read Review) 6106 Bendix 1950's rebranded 5Y3WGTA Heintz & Kaufman NOS (64-66/40 x 2 tubes)
(!!) (Recommended Pair) 12AX4GTA RCA NOS 1960 (98-99/60)
(!!) (Recommended Pair) 80 GE GT-shape NOS 1960 (56/40 and 62/40 x 2 tubes)
(!!) (Recommended Pairs) 12AX4GTB Sylvania NOS 1960's (8 pairs)
(!!) (Recommended Single) 5Y3GT Hytron NOS 1951 (56/40 and 60/40)
(!!) (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)
(!!) (Single) AZ11 Philips Miniwatt by Mullard NOS 1963
(!!) (Single) GZ33 Mullard branded Zaerix NOS 1960's (58/40 and 58/40)
(!!) 5V4G RCA branded CBS black plates used/tests like new 1954 (62/40 and 62/40)
(!!) 6X4 GE NOS gray plates "D" getter NOS 1961 (56/40 and 56/40)
(!!) 6X4 RCA NOS 1969 (50/40 and 51/40)
(!!) 80 Fapesa Miniwatt Argentina NOS 1950's faded printing (52/40 and 56/40)
(!!) 80 GE GT-shape NOS 1957 slightly tilted glass (56/40 and 60/40)
(!!) JAN-CRC-5V4G RCA black plates used/tests like new 1958 (62/40 and 62/40)
(!) (#1 81 ST-19 glass shape) 81 ST-19 Purotron made by RCA "engraved base" NOS in Sparton box 1940's (56/40) (strong output)
(!) (BEST PAIR) 12AL5 RCA NOS (50-50/40 and 51-51/40)
(!) (BEST PAIR) 12AL5 RCA NOS 1973 (50/40 and 50/40 x 2 tubes)
