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6R7GT Sylvania NOS 1947 (111/60)
6R7 Sylvania metal NOS 1940's (106/60)
6BL7GTA Sylvania tests like new faded printing 1960's (59/85ma)
(!!!) (Best Pair #3) 5749W=6BA6 Philips JAN by Sylvania NOS 1980's (10.4ma and 10.3ma) 1-3% matched
(!!!) (Best Pair #4) 5749W=6BA6 Philips JAN by Sylvania NOS 1980's (9.2ma and 9.0ma) 1-3% matched
6S7G RCA NOS 1940's
6BH8 GE NOS (11 in stock)
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 PAIR) 6BL7GTA GE branded Tungsol "D" getter halo NOS 1950's (36.6/37ma and 39/37ma) (close Gm matching)
(!!!!) (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) 6BL7GTA Sylvania black plates NOS 1960's (44.5/40.5ma and 40.5/42.2ma)
(!!!!) (Best Single 1966) 12AX7 Philips Holland NOS 1966 (Gm=1700/2100 and 1.2/1.7ma)
(!!!) (Best Pair #2) 6BL7GTA Sylvania black plates NOS 1960's (39.2/36ma and 37.5/38.6ma)
(!!!) (Best Pair #3) 6BL7GTA Sylvania black plates triple mica NOS 1960 era (32.8/34ma and 34.5/35.6ma) (close Gm matching)
