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12BH7A Matsushita Japan branded Amperex Holland NOS 1970's (8.8ma/9.6ma)
12SL7GT GE branded RCA NOS 1970's (2.2/2.4ma)
12SL7GT GE NOS 1966 (2.0/2.3ma)
12SN7GT RCA NOS 1960 with plate support rods (8.0/8.2ma) 1-2% section balance
272A Western Electric "meshplate" used/good 1963 (5.0ma Gm=600)
328A Western Electric "small punch" NOS 1953 (5.5ma)
407A LM Ericsson Sweden like new 1960's (41/26 and 42/26)
407A LM Ericsson Sweden used/good 1960's
407A Western Electric like new 1968 in white box (54/26 and 64/26)
407A Western Electric used/good 1959 (32/26 and 34/26)
407A Western Electric used/good 1962 (35/26 and 42/26)
421A Western Electric NOS 1984 (read review)
534AX Raytheon NOS (4 in stock)
5651 Sylvania rebranded GE NOS 1960's (2 in stock)
5651A Sylvania rebranded RCA NOS 1983 (1 in stock)
5687WA GE used/tests like new 1970's (44/45ma) (highest Ma and Gm)
5840=EF732 GE NOS 1953 (5.3ma) (Soundelux, Peluso, Brauner)
5840=EF732 Raytheon NOS 1960's (4.7ma)
5840W=EF732 Sylvania NOS 1970's (5.2ma)
5881 International Japan black plate NOS 1960's (70ma)
