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(!!) (Best RCA Single) JRC-6189=12AU7WA RCA black plates "D" getter NOS 1957 (8.6/9.0ma)
5814A RCA NOS 1970 era slightly microphonic (10.2/11.2ma)
5963 RCA Hewlett Packard gray plates used/good 1960 (8.0/9.2ma)
(!) 6189=12AU7WA GE black plates "U" getter NOS 1950's rebranded Dumont 1978 (9.8/10.1ma) 1-2% section balance
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)
(!!!!!) (BEST PAIR 1961) 12AU7=ECC82 Mullard UK ribbed plates NOS 1961 same date codes (9.0/8.8ma and 9.3/9.2ma) (same Gm) 1-3% matched
(!!!!) (Single) ECC82=12AU7 Philips Holland NOS 1969 (11.8/11.4ma) (Same Gm) 1-3% section balance
(!!) 12AU7A Toshiba Japan branded Raytheon ribbed plates NOS 1960's (12/11.2ma) (Same Gm)
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)
(!!!) (BEST PAIR) JG-6189=12AU7WA GE double mica NOS 1963-1964 (10.2/12ma and 10.2/11ma)
JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)
(!!) (Recommended Single) 5814A=12AU7 Hyperlec Brive France (Holland clone) NOS 1970's rebranded National (10.0/11.6ma)
(!!!) (Single 1960) 5814A=12AU7 GE "5 Star" triple mica NOS "o" getter 1960 (8.0/7.9ma)
(!!!!) (Recommended Pair) 12AU7A Amperex and Philips by Mullard UK NOS ribbed plates 1974 (10.6/11.6ma and 10.4/11.2ma) (DAC, linestage)
(!!!) (Recommended Pair) 12AU7A GE NOS 1965-1975 (8.8/8.8ma and 9.2/8.8ma) (Same Gm) (smooth and warm)
(!!) (Best Value Pair) 12AU7A RCA MEXICO NOS "TOP GETTER" original boxes 1970's (9.2/11.4ma and 9.4/10.6ma)
(!!!!) (Recommended Pair) 12AU7A=ECC82 Mullard rebranded "GE" and "Zenith" ribbed plates NOS 1966 (9.8/11ma and 10.4/10.5ma) (smooth rich sound)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 (10.0/10.8ma) (high Gm)
