(GOOD VALUE) ECC801S=12AT7 Telefunken triple mica used/65% 1967 (6.2ma/6.9ma)
(microphonic single) 12AT7 Philips Miniwatt made in Hamburg, Germany by VALVO NOS "D" getter halo 1959 (8.8/10.2ma)
(slightly microphonic tube) 12AT7 Brimar UK black plates "D" getter halo copper grid posts used/good 1955 era (7.2/8.4ma)
(slightly microphonic tube) 12AT7WA=CV455 Mullard NOS "curved D getter halo" copper grid posts 1959 perfect printing (8/9ma)
(slightly microphonic tube) ECC81=12AT7 Mullard NOS "curved D getter halo" copper grid posts 1955 (9.2/10.6ma)
(slightly microphonic) 6201=12AT7 RCA black plates NOS 1976 (11/12.4ma)
(!!!) (Recommended single) 12AT7 Brimar UK black plates "O" getter halo copper grid posts NOS 1957 (16.0/15.2ma)
(!!!!) (Best Pair) JAN-12AT7WC Sylvania black plates NOS 1975-1980 (10/8.6ma and 10.2/9.2ma)
(!!!!!) (Best Sound for the Money Pair) JAN-12AT7WC Sylvania black plates NOS 1980 (7/8ma and 7.3/8.2ma)
(!!!!) (Best Overall Pair) JAN-12AT7WC Sylvania black plates NOS 1979-1980 (9.8/10ma and 10.8/9.8ma)
12AT7 East Germany branded "M" Mühlhausen NOS 1970's (7.2/7.6ma)
12AT7 East Germany branded "M" Mühlhausen used/tests like new stain on glass 1970's (9.4/9.6ma) (high Ma and Gm)
12AT7 Holland branded CBS Hytron NOS large "D" getter halo 1954 (8.4/10.0ma)
12AT7 RCA Black Plates "D" getter used/good mid-1950's
12AT7 Siemens Halske Germany D getter NOS 1957 (6ma/8ma)
12AT7=E81CC=6201 Siemens triple mica NOS 1971 (12/15.8ma)
(!!) (Recommended Single) 12AT7=ECC81 Mullard shield logo NOS 1970 (8.0/8.4ma)
(!!) (SINGLE) M8162=12AT7WA Mullard UK copper grid posts NOS 1963 (9.2/13.5ma)
12AT7WA Raytheon black plates - triple mica - O getter halo 1960's mis-matched triode sections (7/12ma)
12AT7WA=6201 GE NOS gray plates 1965 (7.8ma/10.6ma)
