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(!!) (Recommended Pair) 12AZ7=12AZ7A GE branded Admiral/Westinghouse black plates NOS 1960 (9.0/9.4ma and 9.2/8.0ma) (McIntosh MC275)
(!!) (Recommended Pair) 12AZ7A GE Admiral black plates NOS 1960 (8/9ma and 8/10ma) (McIntosh MC275)
(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
(!!) (Recommended Pair) 12HG7=12GN7A Sylvania coated glass NOS 1970 era (52ma and 55ma)
(!!) (Recommended Pair) 12HG7=12GN7A Sylvania NOS 1970 era (42ma and 43ma)
(!!) (Recommended Pair) 1619 RCA NOS 1952 - 1960's (52ma and 53.6ma)
(!!) (Recommended Pair) 448A Western Electric tipped top used/good 1965 same date codes (26ma and 27.5ma) (close Gm matching)
(!!) (Recommended Pair) 5651WA Sylvania JAN 1980-1982 Diode Voltage Reference (1 pair)
(!!) (Recommended Pair) 5879 RCA branded Raytheon NOS 1960's (2.2ma and 2.4ma)
(!!) (Recommended Pair) 6AC7=VT-112 RCA 1941-1942 used/very good (13/15.3ma) (close Gm)
(!!) (Recommended Pair) 6AE5GT Tungsol branded RCA NOS 1940's (6.7ma and 6.8ma)
(!!) (Recommended Pair) 6AG7 RCA NOS 1960's (30.6ma and 32ma)
(!!) (Recommended Pair) 6AG7 RCA NOS 1960's same date codes (27.5ma and 29.2ma)
(!!) (Recommended Pair) 6AG7Y RCA brown bottom NOS 1958-1964 (27.8ma and 28.8ma)
(!!) (Recommended Pair) 6AV5GA GE NOS 1960's same build (1) CBS (1) Admiral (50ma and 55ma)
(!!) (Recommended Pair) 6AV5GA GE NOS 1968 (45ma and 50ma)
(!!) (Recommended Pair) 6CB5A Sylvania branded Dumont NOS 1960's (58ma and 60ma)
(!!) (Recommended Pair) 6CB5A Sylvania branded Dumont NOS 1960's (82.5ma and 85ma)
(!!) (Recommended Pair) 6CB5A Sylvania branded Dumont NOS 1964-1966 (65ma and 66ma)
(!!) (Recommended Pair) 6CD6GA RCA black plate branded Realistic Lifetime NOS 1960's (77ma and 83ma)
