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(!!!!!) (Best Overall Pair) 12AU7A RCA clear top NOS 1964-1965 good printing (10.2/12ma and 10.8/11.8) (close Gm)
(!!!!!) (Best Single #1) 12AU7 Philips Holland NOS 1968 "O" halo (10.5/10.3ma) (same Gm) 1-2% section balance
(!!!!!) (Best Single #2) 12AU7 Philips Holland NOS 1972 dimpled disc getter (10.8/11.5ma) 1-5% section balance
(!!!!!) (Holland Single) 12AU7 Pope Holland NOS 1971 dimpled disc halo (12/13.4ma)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!) (Best Pair #1) 12AU7WA=6189 RT Radio Technique France NOS 1961 (9.4/9.0ma and 9.2/9.2ma) (close Gm) 1-3% matched
(!!!!) (Best Single #1) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound)
(!!!!) (Best Single #1) 12AU7WA=6189 RT Radio Technique France NOS 1961 (10.6/10.2ma) (High Gm)
(!!!!) (Best Single 1956) ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and large/wide "U" getter branded Haltron 1956 (10/9.2ma) (k62 series) (High Gm) (rare)
(!!!!) (Best Tungsol Pair 1959) 12AU7A Tungsol ribbed plates NOS "U" getter halo 1959 (8.5/8.8ma and 8.8/7.8ma)
(!!!!) (Best Value Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!!) (Best Value Single) ECC82=12AU7 Telefunken Germany <> Bottom ribbed plates NOS 1969 faded printing (10.8/10.0ma) (Highest Gm)
(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
(!!!!) (Single) 12AU7 RCA Italy ribbed plates NOS 1960's (8/10.6ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.2/9.8ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!) (Best Pair #1) 12AU7A RCA clear top NOS 1960's (10.2/11.6ma)
(!!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (10.8/11.4ma)
(!!!) (Best Value Single) CV4003=12AU7 RFT East Germany NOS 1974 (12.2/12.8ma)
