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(!!!) (Good Value Pair) 6SN7GTB RCA ADT NOS 1959 (8.4/7.7ma and 8.8/6.7ma)
(!!!) (Good Value Single) 6SN7GTB Tungsol tall bottle used/good 1960 era (7.5/7.5ma) 1% section balance
(!!!) (Recommended Pair) 6SN7GTB GE used/good 1957-1961 (8.2/7.8ma and 7.6/7.2ma) 1-5% matched
(!!!) (Recommended Single) 6SN7GTB Westinghouse gray plates NOS 1965 (8.6/7.4ma)
(!!!) (Recommended Single) JAN-CHS-6SN7WGT Sylvania parallel black plates like new 1952 (6.8ma and 6.6ma)
(!!!) 6SN7GTB Tungsol brown base "U" getter used/good 1950's (7.0/8.2ma)
(!!!) 6SN7GTB Westinghouse black plates copper grid posts "D" getter 1950's (7.2/8.4ma)
(!!) (Best CBS Single) 6SN7GTB CBS black plates side-getter NOS, the same shape as Sylvania 6SN7GTB 1959 (8.0/8.2ma)
(!!) (Best Value Single) 6SN7GTB RCA used/good 1950's (7.0/7.6ma) (Gm the same)
(!!) (Best Value) 6SN7GTB RCA NOS 1959 side getter (6/8ma)
(!!) (Recommended) 6SN7GTB Raytheon gray plates NOS 1960's in white box (9/10ma)
(!!) (Single) 6SN7GTB GE branded Raytheon NOS 1970's (10/9.6ma)
(!!) (SINGLE) 6SN7GTB Westinghouse Rad-Tel Tube Co. gray plates "O" getter halo NOS 1964 (8.4/7.4ma)
(!!) 6SN7GT RCA used/good 1953 (6.6/7.6ma)
(!!) 6SN7GTA RCA branded CAPEHART used/like new 1955 (8.4/9.8ma)
(!!) 6SN7GTA Sylvania "chrome top" tall bottle used/good 1950 era (6ma/6ma) 1-2% section balance
(!!) 6SN7GTB Raytheon black plates NOS 1960's (7.8/8.2ma)
(!!) 6SN7GTB RCA branded Superior NOS 1960's (7.2/8ma)
(!!) 6SN7GTB Sylvania used/75% 1960's (6.0/6.4ma)
(!!) 6SN7GTB Tungsol black plates tall bottle "U" getter used/75% 1950's (6.2/6.0ma)
