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(!!!) (Good Value Single) 12AU7 Philips Australia NOS 1970 era (9.6/8.8ma) (same internals as Holland made)
(!!!!) (Best Value Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (10.8/11.4ma)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
(!!!!) (Best Pair #1) 12AU7A RCA clear top NOS 1963-1964 (8.4/8.6ma and 8.2/8.4ma) (Close Gm matching) (Best audio grade 12AU7)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.2/9.8ma)
(!!!) (Single) 12AU7A RCA clear top NOS 1968 (8/11ma)
(!!!) (Recommended Single) 12AU7A RCA clear top NOS 1960 era (9.6/9.8ma) (Same Gm)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/10.8mA)
(!!!!) (Best Single #2) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!!!) (Recommended Single 1957) 12AU7A Zenith Sylvania D getter NOS 1957 (13.0/13.2ma)
(!!) 12AU7A Sylvania NOS 1970 (8.8/9.2ma)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom ribbed plates like new 1959 (9.6ma/11.8ma)
(!!!) (Best Value) 12AU7=ECC82 Daystrom Mullard UK ribbed plates like new 1963 (9.0/10.2ma) (162 series) (smooth presentattion)
(!!) (Single) 12AU7 Tungsol gray ribbed plates D getter NOS 1957 (11.5/8ma)
(!!!!) (Best Single 1965) CV491=12AU7=ECC82 Mullard UK NOS ribbed plates 1965 (12.5/11.8ma) (High Gm)
(!!!!) (Best Single) 12AU7 TEN KOBE JAPAN NOS 1967 (9.8/9.5ma) (same Gm) (rare)
(!!!!) (Single) 12AU7 RCA Italy ribbed plates NOS 1960's (8/10.6ma)
