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12SK7GT RCA NOS 1940's (8.6ma)
12SK7GT RCA NOS 1940's (9.0ma)
12SK7GT Rogers Canada used/tests like new 1950's slightly tilted glass (8.8ma)
12SK7GT Tungsol used/tests like new 1940's, 50% of base is rusted/tarnished (8.6ma)
12SK7GT Wizard by Sylvania used/good 1940's (7.5ma)
12SL7GT GE branded RCA NOS 1970's (2.2/2.4ma)
12SL7GT GE NOS 1966 (2.0/2.3ma)
12SN7GT CBS NOS 1950's (9.0/9.6ma)
12SN7GT Raytheon used/good 1949 (6.2/6.2ma)
12SN7GT RCA branded CHIEF NOS 1963 (8/9.2ma)
12SN7GT RCA NOS 1960 with plate support rods (8.0/8.2ma) 1-2% section balance
12SN7GTA GE branded Westinghouse low hours 1960's (7.0/7.4ma)
12SN7GTA GE Honeywell gray plates used/good 1960's (6.0/6.8ma)
12SN7GTA GE NOS 1959 (7.2/7.0ma)
12SN7GTA GE NOS 1970 era (8.2/7.4ma)
12SN7GTA GE NOS 1974 (10/9.4ma)
12SN7GTA GE NOS 1976 (10.4/10.4ma) 1% section balance
12SN7GTA RCA coin-base branded GE NOS 1980 (12.2/12.2ma) 1-2% section balance
12SQ7 GE metal can NOS 1964 (94/60)
12SQ7GT Emerson by RCA used/good 1940's (90/60)
