(!!!) (Best Single from 1951) 12SN7GT GE parallel black ribbed plates 1951 (7.6/8.4ma)
(!!!) 12SN7GTA Sylvania branded RCA used/good 1967 (10/12.5ma)
(!!) 12SN7GT Sylvania Philco chrome top black plates NOS 1956 (8.2/8.4ma)
(!) (Single) 12SN7GTA RCA black plates NOS 1960's (8.4/8.0ma)
(!!!!) (Best Single) 12SN7GTA Sylvania branded GE NOS 1960's (11.0/11.4ma) (same Gm)
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 RCA coin-base branded GE NOS 1980 (12.2/12.2ma) 1-2% section balance
12SN7GT CBS NOS 1950's (9.0/9.6ma)
(!!!!) (Good Value Pair) 12SN7GTA GE coin-base side getter NOS 1981 (7.4/7.4ma and 7.2/8.0ma) 1-5% matched
12SN7GTA GE NOS 1970 era (8.2/7.4ma)
12SN7GTA GE NOS 1974 (10/9.4ma)
12SN7GTA GE NOS 1969 (9/8.2ma)
12SN7GTA GE NOS 1976 (10.4/10.4ma) 1% section balance
12SN7GTA GE NOS 1959 (7.2/7.0ma)
(!!!) (Recommended Pair) 12SN7GTA GE coin-base side getter NOS 1980 (9.0/8.8ma and 8.6/9.0ma) 1-3% matched (Same Gm)
(!!!!) (Best Pair) 12SN7GTA GE coin-base side getter NOS 1980 (8.4/8.0ma and 8.2/8.4ma) 1-2% matched
(!!!!) (Best Pair) 12SN7GTA GE coin-base side getter NOS 1980 (9.4/9.8ma and 9.0/9.4ma) (close Gm)
