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8077 RCA branded Sylvania NOS 1960's (75/60)
(!!!) (Best Pair) 6BL7GTA GE gray plates NOS 1972 and 1983 (42.5/47.5ma and 41.0/41.5ma) (very close Gm matching)
(!!!) (Best Pair) 6BL7GTA GE black plates NOS 1958 and 1966 (43.0/44.5ma and 40.5/41.5ma) (very close Gm matching)
8077 Sylvania NOS 1970's (95/60)
(!!!) (Best Value Single) GL-6072 GE 5 star triple mica black plates "D" getter halo 1953 era used/very good faded printing (4.0/3.2ma) (V1 guitar amp, mics, Audio Note)
6F8G GE black parallel ribbed plates NOS 1940's (6.2ma/7.2ma)
(!!!!) (Best Quad) 6BL7GTA Sylvania black plates NOS 1960's same build matched quad
(!!!!) (Single) 12AT7=ECC81 Mullard UK used/tests like new 1968 (10.2/12.2ma)
(!!!!) (Best Pair #1) ECC82=12AU7 Philips and Pope Holland NOS 1971-1972 (12.6/12.8ma and 12.3/12.6ma) 1-3% section balance (Highest mA and Gm)
(!!) (Single) ECC82=12AU7 Philips Holland NOS 1969 faded printing (11/10ma)
(!!!!) (Best Single 1966) 12AX7 Philips Holland NOS 1966 (Gm=1700/2100 and 1.2/1.7ma)
(!!!!) (BEST PAIR #2) 6AN8A RCA NOS 1966-1973 (15.6/16.5ma and 15.6/13.4ma) (close Gm)
(!!!) (BEST 6BM8 - best sound) ECL82=6BM8 Telefunken Germany <> bottom NOS branded Siemens 1969 (2.6/44ma)
(!!!!!) (Bets Value Single) GL-6072 GE 5 star triple mica black plates "D" getter halo used/tests like new 1953-1954 faded printing (2.9/2.4ma) (V1 guitar amp, mics, Audio Note)
(!!!!!) (Best Pair #2) GL-6072 GE 5 star triple mica black plates "D" getter halo low hours/test like new faded printing (2.3/2.4ma and 2.5/2.6ma) (Same Gm) (Audio Note, Kondo, mics)
6A8 Philco metal can NOS 1940's (99/60)
(PAIR) JAN-5725W=6AS6 GE gray plate NOS 1986 (4.2ma and 4.1ma) (strong Gm)
6111 France NOS 1962 (7.4/9.8ma)
(!!) (Single) 6SN7GTA Philco Sylvania "chrome top" used/good 1954 (6.4/6.8ma)
(!!) 6SN7GTA Crosley Sylvania "chrome top" used/good 1954 (6.8ma/7.4ma)
