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(!!!) (Single 1956) 12AY7 GE "D" getter like new 1956 (3.1/2.8ma)
(!!!) 12AY7 GE NOS rebranded Raytheon 1960's (2.8/3.4ma)
(!!!) 6V6G Super Silvertone by Sylvania used/good 1930's (37ma)
(!!!) 6V6G Zenith Sylvania engraved base used/good 1930's (39ma)
(!!!) 6V6GT Sylvania green leaf NOS 1940's (60ma)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1600 and 0.6./1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1960's faded printing (Gm=1400/1600 and 0.9/1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1972 (Gm=1450/1400 and 0.9/0.8mA) (V1 guitar amp)
(!!) (Best Single) 5Y3GT Tungsol NOS 1956 (60/40 and 56/40)
(!!) (Recommended SIngle) 6V6GT Raytheon Silvertone black coated glass NOS 1940's (50.5ma)
(!!) 12AX7 GE branded Video black plates D getter 1957 used mis-matched triode sections (1.1ma/0.6ma)
(!!) 6V6GT Metro Holland NOS 1960's unknown maker (49ma)
(!!) 6V6GT Philco by Sylvania tests like new 1957 (42.2ma)
(!!) JG-12AY7 GE "D" getter 1956 used/good (2.1/2.3ma)
(!) (Best Single) 6V6GT Tungsol gray plate coated glass NOS 1951-1956 (64ma)
(!) (Best Single) 7408=6V6GT Sylvania branded Amperex NOS 1974 (41.5ma) (rare)
(!) (Best Value) 7025A=12AX7A China branded International Yugo NOS 1990's (1.0/0.9ma and Gm=1700/1600)
(!) (Recommended Single) 5881=6L6WGB GE NOS 1960's (72.5ma)
(!) 6V6GT Sylvania used/good 1946 (38ma)
(!) 6V6GTY GE Canada brown base black plate NOS 1970 (42.5ma) (similar to RCA black plate)