(!!!!!) (Recommended GE Pair) 6SL7GT GE NOS 1970's series filament - round silver/chrome plates same build (2.1/2.6ma and 2.4/2.8ma)
(!!!!) (Best Value Single) 12AX7 Hitachi Japan branded ITT NOS 1963 (1.0/1.7ma and Gm=1500/1950)
6BQ5 Lindal Japan like new 1970's (50ma)
6BQ5 Lindal Japan NOS 1970's (42ma)
6BQ5 Lindal Japan NOS 1978 (59.5ma)
6BW4 Sylvania black plates used/good 1954-1955
6BW4 Sylvania branded Lindal black plates NOS 1960's
6
