(slightly microphonic) 12BH7 GE Zenith NOS "U" getter 1953 (10.0/10.6ma)
12AZ7 GE black plates "D" getter halo NOS 1955 (11ma/7.5ma)
12SN7GT CBS NOS 1950's (9.0/9.6ma)
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
407A Western Electric used/good 1967
407A Western Electric used/good 1972
6CG7 Sylvania gray plates NOS "U" getter 1958 with chrome electrostatic shield between plates (6.8ma/8.8ma)
6L6GB Sylvania Black Plate used/good 1955 faded top getter (65ma) (high Ma and Gm)
6X4 GE like new 1950's "D" getter (54/40 and 54/40)
6X4W GE used/tests like new 1960 era "D" getter (52/40 and 52/40)
EL60 Philips Miniwatt Holland metal base NOS 1955 (67ma)
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)