(!) (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)
(!) 12AU7=ECC82 Brimar tall narrow plates used/good 1960 faded printing (7.8/9.6ma)
(!) 12AU7=ECC82 Miniwatt France used/good 1970 (10/9.6ma)
(!) 12AU7A Hitachi JAPAN branded Realistic Lifetime NOS ribbed plates 1960 era (9.2/12.2ma)
(!) 12AU7A=ECC82 GE Brimar ribbed plates used/good 1967 (9.5/9.8ma)
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 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)
(slightly microphonic tube) 12AU7 RCA tall black ribbed plates "D" getter halo tests like new 1950's (9.4/10.0ma)
(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 NOS 1960 era (11.6/10ma)
12AU7A Sylvania NOS 1970's (10.6/9.2ma)
12AU7A Sylvania NOS 1970's (9.0/9.1ma)
5814A RCA NOS 1970 era slightly microphonic (10.2/11.2ma)
5963 RCA black ribbed plates" and D getter halo NOS 1957 (sold out - read review)
