(!!!!) (Best Single 1956) 12AU7=ECC82 Amperex Holland "long-plates" large "D" getter with crossbar like new 1956 (9.2/8.2ma) (rare)
(!!!!!) 12AU7 Philips Holland "O" getter halo 1969 low hours/tests like new (9.6/8.6ma)
(!!!!) (Best Pair) JTL-5814A Tungsol ribbed plates 1959-1960 (10.6/10.0ma and 10.0/10.4ma)
(!!!!) (Best Value Pair - warm and smooth) 6680=12AU7A GE NOS 1970's 1-2% matched (8/8ma and 7.7/7.9ma)
(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1972-1973 (9.6/10.6ma and 9.3/10.4ma) 1-3% matched
(!!!!) (Recommended Single) CV491=12AU7=ECC82 Brimar UK NOS ribbed plates large "O" getter halo 1966 (9.4/10.4ma)
(!!!!) (Recommended Single) 12AU7A Sylvania NOS 1960's (10/2/11.2ma)
(!!!!) (Recommended Pair) ECC82=12AU7 Telefunken Germany <> Bottom smooth plates NOS 1960's - 1970 faded printing (8.2ma/8.6ma and 8.8/9.2ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!) 6189=12AU7WA RCA black plates NOS 1971 (9.0/9.6ma)
(!!!) (slightly microphonic) 12AU7A Westinghouse black plates "D" getter halo 1964 NOS (9.6/10.6ma) (similar to RCA black plates)
(!!!!) (Best Overall Pair) ECC82=12AU7 Telefunken Germany <> Bottom smooth plates NOS 1961-1965 very good printing (9.8/10.9ma and 9.8/10.4ma) 1-5% matched
(!!!) (BEST PRICE) 12AU7A GE used/good 1961 - 1984 (4 for $29.99)
(!!!) (Best Single) GB-5814A Sylvania Gold Brand Gold Pins NOS 1960 era (11.8/10.8ma) (same Gm)
(!!!) (Best Value Single) 12AU7A RCA CANADA (Philips Plant) NOS 1964 same build as Mullard UK (9.0/9.2ma) 1-2% section balance
(!!!) (Best Value Single) 5814A GE 5 STAR "O" getter NOS 1960's faded printing (9.6/11.8ma)
(!!!) (Best Value Single) CV4003=12AU7 RFT East Germany NOS 1974 (12.2/12.8ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (7.5/9.6ma and 7.5/9.2ma)
(!!!) (Good Value Single) 12AU7 RCA black plates "D" getter mid-1950's used/tests like new (9.8/11.4ma)
(!!!) (Good Value Single) 12AU7A RCA NOS 1960's faded printing (9.3/11.8ma)