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(!!!!) (BEST Pair) 5963=12AU7 RCA NOS ribbed plates 1965-1973 (12.4/12.6ma and 11.4/11.6ma) (Highest mA and Gm)
(!!!!) (Best Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/9.5, 8.8/9.4, 9.0/9.3, 9.0/9.4mA) (Highest Gm 1-2% matched)
(!!!!) (Best Single #1) 12AU7=ECC82 Mullard UK shield logo NOS 1963 (10.2/11.0ma) (smooth rich sound)
(!!!!) (Best Single #2) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound) (Copy)
(!!!!) (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 1985) 12AU7A GE NOS 1985 copper grid posts (9.2/9.4ma) 1-2% section balance
(!!!!) (Best Telefunken Single 1966) ECC82=12AU7 Telefunken Germany <> bottom smooth plates NOS 1966 (9.3/10ma) (High Gm)
(!!!!) (Best Value Single) 12AU7=ECC82 Mullard UK ribbed plates like new 1965 (10/12.8ma) (smooth rich sound)
(!!!!) (Best Value Single) 12AU7=ECC82 Philips by Mullard UK ribbed plates used/good 1969 (8.2/8.2ma) 1% section balance
(!!!!) (Best Value Single) 12AU7A Sylvania low hours like new 1960's (8.8/8.4ma)
(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
(!!!!) (Holland Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!!) (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=ECC82 Mullard rebranded "GE" and "Zenith" ribbed plates NOS 1966 (9.8/11ma and 10.4/10.5ma) (smooth rich sound)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.0/10.4ma and 9.4/10.0ma) 1-3% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/8.8ma and 9.4/9.0ma) 1-2% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/9.4ma and 9.8/9.6ma) 1-3% matched (same Gm)
(!!!!) (Recommended Single 1957) 12AU7A Zenith Sylvania D getter NOS 1957 (13.0/13.2ma)
(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
