(!!!!!) 12AU7 Philips Holland "O" getter halo 1969 low hours/tests like new (9.6/8.6ma)
(!!!!) (Best 5814 Single) JG-5814 GE NOS "short wide ribbed black plates" 1953 (11.2/12.0ma) (High Ma and Gm)
(!!!!) (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)
(!!!!) (Best Value Single) 12AU7=ECC82 IEC Mullard UK ribbed plates used/tests like new 1967 (10.6/15.6ma)
(!!!!) (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 Single) ECC82=12AU7 Telefunken Germany <> Bottom smooth plates NOS Tektronix Checked 1960's (8.2ma/8.6ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.4/11ma and 10.4/10.8ma) 1-2% matched
(!!!) 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 5-Star) 5814A=12AU7 GE "5 STAR" NOS 1970 (10/11.2ma)
(!!!!) (Best Overall Pair) ECC82=12AU7 Telefunken Germany <> Bottom smooth plates NOS 1964-1968 (10.6/10.2ma and 10.5/10.8ma) (High mA and Gm)
(!!!) (BEST PRICE) 12AU7A GE used/good 1961 - 1984 (4 for $29.99)
(!!!) (Best RCA Single) USAF-6189=12AU7WA RCA black plates "D" getter NOS 1961 (9.8/10.2ma)
(!!!) (Best Single) GB-5814A Sylvania Gold Brand Gold Pins NOS 1960 era (9.0/9.8ma)
(!!!) (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)
