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(!!) 12AU7A RCA CANADA NOS "D" getter halo 1950's tip is chipped (10.0/10.4ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
(!!) 12AU7A RCA clear top used/good 1964 (8.2/8.6ma)
(!!) 12AU7A Sylvania NOS 1960 era (11.6/9.4ma)
(!!) 12AU7A Sylvania NOS 1970 (8.8/9.2ma)
(!!) 12AU7A Toshiba Japan branded Raytheon ribbed plates NOS 1960's (12/11.2ma) (Same Gm)
(!!) 12AU7WA=6189 Sylvania NOS 1960's (8.8/9.0ma)
(!!) 5963=12AU7 RCA NOS 1963 (9.2/9.6ma)
(!!) JRC-12AU7 RCA NOS long gray plates mid-1950's "D" getter (9/11.6ma)
(!) (Best Value Single) ECC82=12AU7 Zaerix East Germany NOS 1970's (12.8/12.0ma) (same Gm)
(!) (Single) 5963=12AU7 GE NOS 1960's (11.6/11.8ma)
(!) (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)
