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(!!) (BEST SINGLE) 6DN7 GE branded RCA NOS 1960's (64ma and 7.2ma)
(Best Single) 6DN7 GE branded RCA NOS 1962 (45ma and 8.2ma)
(BEST SINGLE) 6DN7 RCA NOS 1968 (38ma and 10.2ma)
(Best Single) 6DN7 Sylvania NOS 1960's (60ma/8.3ma)
6DN7 RCA Mexco coin-base same internals as Sylvania NOS 1970's (40ma and 8.5ma)
6DN7 Sylvania NOS 1970 era (39ma and 7.5ma)
