(!) 12AT7 Mullard Heath "D" getter used/good 1959 (6.4/7.6ma)
(!) 12AT7 Mullard Heath "D" getter used/like new 1960 (8.0/9.6ma)
(!!!!) (Best Pair #3) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (10.3/11.0ma and 10.8/10.2ma) 1-5% matched
(!!!!) (Best Pair #2) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (9.5/9.2ma and 10/9.6ma) 1-3% matched (close Gm)
(!!!!) (Recommended Pair) JAN-12AT7WC Philips by Sylvania black plates NOS 1981-1982 (8.3/8.4ma and 8.4/7.8ma)
(!!!!) (Good Value Pair) JAN-12AT7WC Philips by Sylvania black plates NOS 1981-1982 (6.8/6.8ma and 7.0/7.2ma)
(!!!!) (BEST SINGLE) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (12.4ma/14.0ma)
(!) 6201=12AT7WB GE 5 Star gray plates used/good 1964 (6.5ma/6.0ma)
(!!!!) (Best Pair #3) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (11.6/12.2ma and 11.2/10.5ma)
(!!!!) (SINGLE) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (9.8ma/13.4ma)
