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(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10.6/7.4ma) (1st series made)
(!!!!) (Single 1958) 5751 Sylvania black plates triple mica D getter halo 1958 used/good (2.7/2.3ma)
(!!!!) (Single 1960) 12AX7 Westinghouse gray pinched plates "D" getter like new 1960 era (Gm=1600/1500 and 1.2/1.0ma)
(!!!!) (Single 1960) 12AX7 Westinghouse gray pinched plates "D" getter like new 1960 era (Gm=1700/1600 and 1.2/1.2ma) 1-2% section balance
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!!!) (Single) 10 Sylvania "engraved base" 1930's NOS (29ma)
(!!!!) (Single) 12AT7 Philips by Mullard UK NOS 1965 (14.3/8.5ma)
(!!!!) (Single) 12AT7 RCA NOS 1965 (7.2/12.8ma) (good tone)
(!!!!) (Single) 12AT7=ECC81 Mullard UK used/tests like new 1968 (10.2/12.2ma)
(!!!!) (Single) 12AU7 RCA Italy ribbed plates NOS 1960's (8/10.6ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1963 copper grid posts (8.9/10.2ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1972 copper grid posts (10.6/9.8ma) (warm and smooth)
(!!!!) (SINGLE) 12AU7A GE NOS 1976 copper grid posts (9.4/8.8ma)
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1953 (0.8/0.8ma and Gm=1400/1400) 1% section balance
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1956 (0.9/1.0ma)
(!!!!) (Single) 12AY7 GE branded Raytheon black box plates "D" getter 1953 era in white box (3.3/3.1ma) (Same Gm)
(!!!!) (Single) 12BH7 Tungsol branded Shield gray oval plates "U" getter halo NOS 1961 (11.8/16.5ma) (Highest mA and Gm)
(!!!!) (Single) 12BH7A GE gray oval plates 1962 (6.6/9.6ma)
(!!!!) (Single) 12BH7A GE gray oval plates NOS mid-1960's (11.5/16ma)
(!!!!) (Single) 12BH7A Sylvania gray oval plates "O" getter NOS 1960 era (10.4/7.6ma)
