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(!!!!!) (Best Sound for the Money Pair) JAN-12AT7WC Sylvania black plates NOS 1980 (7/8ma and 7.3/8.2ma)
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=ECC81 Haltron East Germany NOS 19740's (7.2/7.0ma) 1-2% section balance
12AT7 Siemens Halske Germany D getter NOS 1957 (6ma/8ma)
(!!) (Recommended Single) 12AT7=ECC81 Mullard shield logo NOS 1970 (8.0/8.4ma)
(!) 12AT7WA Raytheon NOS 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)
6201=12AT7WA RCA Black Plates "o" getter halo used/like new 1961 (8.6/7.8ma)
12DT8 RCA black plates NOS 1970 (23.0/24.4ma) (highest Ma and Gm)
12DT8 Sylvania black plates NOS 1970's (14.5/10.5ma)
12DT8 RCA gray plates NOS 1970's (12.2/16.4ma)
12DT8 RCA gray plates NOS 1970's (12.6/14.0ma)
(!!) (Best Value Single) 12AT7WA Raytheon black plates - triple mica - O getter halo 1975 era like new (8.5/9.2ma)
(!) (Best Value Single) ECC81=12AT7 Siemens Halske Germany "D" getter 1960 era used/good (8.8/7.5ma)
(!!!!) (Best Pair #1) 6201=12AT7=E81CC Philips SQ by Mullard UK gold pins NOS 1974 (10.7/10.6ma and 10.6/11.0ma) (closely matched)
(!!!) (Recommended Single) 12AT7 Tungsol rebranded AKRAD "U" getter NOS 1956 (6.2/6.6ma)
(!!) (BEST VALUE) 12AT7 Telefunken Germany <> bottom used/tests like new 1960's faded printing (10.6ma/13.0ma)
