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(!) 6EU7 RCA NOS 1970 era (51/32 and 52/32)
(Best Single) 6BQ5 Raytheon NOS 1960's (62ma)
(Best Value Pair) EL34 Mullard UK used/good XF2 single halo 1971 (74ma and 78ma)
(Best Value) 6BQ5 GE branded Westinghouse NOS 1960's (38.5ma)
(Best Value) 6BQ5 GE NOS/80-85% 1959 (36ma)
(DISPLAY TUBE) 350B Western Electric used 1967 (display tube - defective)
(PAIR) 0D3A Russian rebranded GE Holland NOS 1980 (1 pair)
(READ REVIEW) 6SN7GTB GE NOS 1966-1968 (7.4/6.2ma and 7.6/6.8ma) (same Gm)
(Read Review) 6SN7GTB GE NOS 1968-1974 (Schiit)
(slightly microphonic) JAN-5751 Sylvania NOS 1973 (2.0/2.3ma)
12AT7 East Germany branded "M" Mühlhausen NOS 1970's (7.2/7.6ma)
12AT7 East Germany branded "M" Mühlhausen used/tests like new stain on glass 1970's (9.4/9.6ma) (high Ma and Gm)
12AT7=ECC81 Haltron East Germany NOS 19740's (7.2/7.0ma) 1-2% section balance
12SN7GTA GE branded Westinghouse low hours 1960's (7.0/7.4ma)
311CH Cetron NOS in original box 1979 (100ma) (311CH is sub for 211H)
5687WA GE used/tests like new 1970's (44/45ma) (highest Ma and Gm)
5R4GYB RCA brown base like new 1970's part of glass partially melted into bottom mica (48/40 and 49/40)
5R4GYB RCA brown base NOS 1970's part of glass melted into bottom mica (50/40 and 53/40)
5U4GB Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
6550A GE stapled plates used/good 1980's (115ma)
