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(!!!) (Recommended Black Plates) 12AU7A Westinghouse black plates 1960 era rebranded United 1981 "D" getter halo (8.4/9.8ma) (similar to RCA black plates)
(!!!) (Recommended Pair) 407A Western Electric NOS "D" getter 1962-1970 (36-39/26 and 34-38/26)
(!!!) (Recommended Pair) 407A Western Electric NOS "O" getter 1978 (35-43/26 and 37-43/26)
(!!!) (Recommended Pair) JTL-5654=6AK5W Tungsol gray plate "D" getter used/good 1956-1958 (6.4ma and 6.5ma)
(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (9.2/10.2ma)
(!!!) (Single 1960) ECC83=12AX7 VALVO Germany made in Hamburg "O" getter used/good 1960 (0.9/1.0ma)
(!!!) (SINGLE) 12AU7 RCA tall black plates "D" getter used/good 1950's (9.8/8.2ma)
(!!!) (Single) JHS-5670 Sylvania NOS 1966 (7.0/6.8ma)
(!!!) (slightly microphonic) 12AU7A Westinghouse black plates "D" getter halo 1964 NOS (9.6/10.6ma) (similar to RCA black plates)
(!!!) 12AU7 RCA tall gray plates "D" getter used/good 1953 (9.2/9.8ma)
(!!) (Best Overall Single) 407A Western Electric NOS 1963 (53/26 and 53/26) 1-2% section balance
(!!) (Best Pair #2) 407A Western Electric D getter NOS 1966-1968 (40-40/26 and 42-43/26) 1-5% section balance
(!!) (Best Pair) 6J6A Tungsol NOS "D" getter 1961 (9.4/10.5ma and 9.0/11.4ma)
(!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (9.8/9.6ma)
(!!) (Best Single) 12AU7A Westinghouse gray plates "O" getter halo 1960's NOS (10.6/11.2ma)
(!!) (Best Single) 12AX7A Westinghouse pinched gray plates "D" getter NOS 1965 (1/1ma and Gm=1600/1700) 1-2% section balance
(!!) (Best Value Used) ECC81=12AT7 Siemens Halske Germany "D" getter 1960 era used/good (8.8/7.5ma)
(!!) (Good Value Single) EL84 Zenith Holland "D" getter used/65% 1959 (35ma)
(!!) (Good Value Single) EL84 Zenith Holland "D" getter used/very good 1958 (41ma)
(!!) (Good Value Single) EL84 Zenith Holland "O" getter used/like new 1962 (62ma)
