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(!!!!) (Single) 12AT7=ECC81 Mullard UK used/tests like new 1968 (10.2/12.2ma)
(!!) (SINGLE) 12AT7 RCA used/good 1960's (5/6ma)
(!!!) (Recommended Pair) 12AT7 GE gray plate NOS 1961 (12.0/13.4ma and 13.2/12.5ma)
(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1981 (11.2/7.6ma)
(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1981 (7.5/7.8ma)
(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1982 (6.0/8.8ma)
(!!!!) (BEST PAIR) 6201=12AT7WC GE "5 STAR" NOS double mica, copper grid posts, gray plates, 1972 (10.8/12ma and 11.2/11.0ma)
(!!!!) (BEST PAIR #2) 6201=12AT7WC GE "5 STAR" NOS double mica, copper grid posts, gray plates, 1972 (7.2/8.6ma and 8.6/8.2ma)
(!!!!!) (Best Pair) ECC801S=12AT7 Telefunken Germany <> bottom NOS triple mica 1962 and 1970 (8.2/8.0mA and 8.3/8.6mA) (1-3% matched)
