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12AZ7 GE black plates "D" getter halo NOS 1955 (11ma/7.5ma)
12SN7GT CBS NOS 1950's (9.0/9.6ma)
12SN7GT Raytheon used/good 1949 (6.2/6.2ma)
12X4 RCA Motorola black plates "D" getter NOS 1960 era (48/40 and 49/40)
407A LM Ericsson Sweden like new 1960's (41/26 and 42/26)
407A LM Ericsson Sweden used/good 1960's
407A Western Electric used/good 1959 (32/26 and 34/26)
407A Western Electric used/good 1962 (35/26 and 42/26)
6L6GB Sylvania Black Plate used/good 1955 faded top getter (65ma) (high Ma and Gm)
6X4 GE Beckman like new "D" getter 1962 (54/40 and 52/40)
6X4 GE like new 1950's "D" getter (54/40 and 54/40)
EL84 Siemens Halske Germany NOS 1967 (45ma)
EL84 Siemens Halske Germany used/tests like new 1971 no printing (48.2ma)
JHS-12AU7 Sylvania "black plates" with "D" getter used/mis-matched sections (7.6/12ma)