(!!) (Good Value) 12AT7=ECC81 Siemens Halske Germany NOS 1970 (10.3/11.0ma)
(!!) (Recommended Single) ECC801S=12AT7 Siemens Munich Germany NOS 1981-1982 (13.4/18ma)
(!!!) (slightly microphonic single) ECC801S Telefunken <> bottom rebranded 12AT7/ECC81 Telefunken NOS 1962 (9.2ma/10.2ma)
(GOOD VALUE) ECC801S=12AT7 Telefunken triple mica used/65% 1967 (5.6ma/6.0ma)
(GOOD VALUE) ECC801S=12AT7 Telefunken triple mica used/65% 1967 (6.2ma/6.9ma)
