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(!) (Single) 5963=12AU7 GE NOS 1960's (11.6/11.8ma)
(!) (Single) USAF-5814A=12AU7WA GE triple mica like new 1962-1963 (11.4/12.0ma) (same Gm)
(!) (slightly microphonic single) 12AU7 Hitachi JAPAN branded IEC Mullard NOS ribbed plates 1968 (9.4/11ma)
(!) (Slightly microphonic) JG-5814A GE NOS triple mica "U" getter halo 1956 (10.2/10.4ma) 1-2% section balance (high Ma and Gm)
(!) 12AU7 Tungsol gray ribbed plates NOS square or "D" getter halo 1954 in white box (8.2/8.6ma)
(!) 12AU7A Hitachi JAPAN branded Realistic Lifetime NOS ribbed plates 1960 era (9.2/12.2ma)
(!) 12AU7A Sylvania NOS 1960 (10/10.1ma) 1-2% section balance
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance
(!) 6189=12AU7WA GE black plates "U" getter NOS 1950's rebranded Dumont 1978 (9.8/10.1ma) 1-2% section balance
(!) ECC82=12AU7 Valvo Holland used/good 75-90% 1968 (7.8/9.0ma)
(!) JTL-12AU7 Tungsol narrow plates "D" getter NOS 1955 bottom mica is tilted (10.4/10.6ma)
(READ REVIEW) 12AU7 RCA black plates "D" getter mid-1950's used/tests like new (9.8/11.4ma)
(READ REVIEW) 12AU7=ECC82 RT Radio Technique France long plates 1958-1959 (11.6/9.8ma) (close Gm)
(READ REVIEW) ECC802S=12AU7 Telefunken Germany <> bottom NOS 1970 good printing (11.6ma and 11.5ma) (same Gm) 1-2% section balance
(READ REVIEW) JG-5814A=12AU7 GE triple mica NOS "o" getter 1958-1959 (9.8/9.6ma) 1-2% section balance
(slightly microphonic tube) 12AU7A RCA tall black ribbed plates "D" getter halo used/good 1950's (8.2/8.8ma)
(slightly microphonic tube) JRC-12AU7 RCA tall black ribbed plates "D" getter halo tests like new 1950's (9.6/10.4ma)
12AU7=ECC82 Brimar branded Tronix tall narrow plates used/good 1960 (6.4/7.2ma)
12AU7A Sylvania Dumont NOS 1960's (10/8.8ma)
5814A RCA NOS 1970 era slightly microphonic (10.2/11.2ma)
