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(slightly microphonic tube) ECC81=12AT7 Mullard NOS "curved D getter halo" copper grid posts 1955 (9.2/10.6ma)
12AT7 East Germany branded "M" Mühlhausen NOS 1970's (7.2/7.6ma)
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=ECC81 Haltron East Germany NOS 19740's (7.2/7.0ma) 1-2% section balance
