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(!!!!!) (Best Pair #1) 12AU7=ECC82 Mullard UK ribbed plates NOS 1974 same date codes (9.2/9.1ma and 9.2/10.2ma) (Rogue, Hovland, Audio Note, Prima Luna) (Same Gm)
(!!!!!) (Best Pair #3) 12AU7=ECC82 Mullard UK ribbed plates NOS 1961-1964 (10/9.6ma and 10.8/10ma) (Rogue, Hovland, Audio Note, Prima Luna) (Close Gm)
(!!!!!) (Best Pair #3) 12AU7=ECC82 Mullard UK ribbed plates NOS 1972-1976 (10.2/12.8ma and 11.2/12ma) (Rogue, Hovland, Audio Note, Prima Luna) (Close Gm)
(!!!!!) (Best Single #1) 12AU7 Mullard UK "long plates" and "O" getter 1958 NOS (10.2ma and 10.6ma) (Same Gm)
(!!!!!) (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 #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.4/8.8ma and 8.4/9.0ma) 1-2% matched (same Gm)
(!!!!) (Best Pair #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.6/8.8ma and 8.8/9.2ma) 1-3% matched
(!!!!) (Best Pair #2) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/8.4ma and 8.4/8.8ma) 1-2% matched
(!!!!) (Best Single #2) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound)
(!!!!) (Best Single #3) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (12.0/10.2ma)
(!!!!) (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 Single 1969) ECC82=12AU7 Philips Holland NOS 1969 (11.2/11.7ma) 1-3% section balance
(!!!!) (Best Single) ECC82=12AU7 Philips Holland NOS 1972 (12/12ma) 1-2% section balance
(!!!!) (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) 12AU7=ECC82 Philips by Mullard UK ribbed plates used/good 1969 (8.2/8.2ma) 1% section balance
(!!!!) (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)
(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
