(!!!!!) (Best Value Pair) 6SN7GTB GE NOS 1955-1964 same build (6.1/6.5ma and 6.0/6.3ma)
(!!!!!) (Best Value Pair) 6SN7GTB GE NOS 1964-1965 same build (6.4/7.0ma and 6.6/7.6ma)
(!!!!) (Good Value Pair) 6SN7GTB GE NOS and like new 1960-1964 (7.0/7.8ma and 7.0/6.8ma)
(Read Review) 6SN7GTB GE NOS 1968-1974 (Schiit)
