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(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)
5963 RCA black ribbed plates" and D getter halo NOS 1957 (sold out - read review)
5963 RCA Hewlett Packard gray plates used/good 1960 (8.0/9.2ma)
6189W GE JAN NOS 1973 mica flake inside tube (9.0/9.2ma) 1-2% section balance
6189W GE JAN NOS 1981 (8.4/9.0ma)
CV4069=12AU7 Brimar UK NOS with flying leads (no pins)
ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and "O" getter NOS 1958 (10.4/11.8ma)
JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)
JHS-12AU7 Sylvania "black plates" with "D" getter used/mis-matched sections (7.6/12ma)
