12AT7WA=6201 GE NOS gray plates 1965 (7.8ma/10.6ma)
12DT8 RCA black plates NOS 1970 (23.0/24.4ma) (highest Ma and Gm)
12DT8 RCA gray plates NOS 1970's (12.2/16.4ma)
12DT8 RCA gray plates NOS 1970's (12.6/14.0ma)
(!) (Best Value) 12AT7WA Raytheon black plates - triple mica - O getter halo 1965 era like new (8.5/9.2ma)
(!!!) (Recommended Single) 12AT7 Tungsol rebranded AKRAD "U" getter NOS 1956 (6.2/6.6ma)
(!!) (BEST VALUE) 12AT7 Telefunken Germany used/good 1965 (9.2ma/8.4ma)
6201=12AT7 GE "5 STAR" used/good triple mica "U" getter halo, copper grid posts, gray plates, 1957 (6.2/7.8ma)
(!!) (Recommended Single) 6201=12AT7WA GE "5 STAR" NOS 1970 (8.0/9.2ma)
6679 (see 12AT7)
(!!!!) (Best RCA Single 1964) 6201=12AT7WA RCA black plates NOS 1964 (9.8/7.4ma) (best tone)
(!!!) (Best Value Pair) JAN-12AT7WC GE gray plates NOS 1970 (7.0/7.6ma and 7.0/8.2ma)
(!!!) 12AT7WB Raytheon NOS black plates triple mica used/good 1960's (7.8/8.4ma)
(!!!) (Best Value Pair) 12AT7WB=6201 GE NOS 1965-1969 (6.0/7.4ma and 6.0/7.2ma)
(!!!!) (Best Value Pair) JAN-12AT7WC GE gray plates NOS 1982 (7.5/9ma and 8/9.4ma)
(!!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1975-1978 (7.2/8.2ma and 7.0/8.8ma)
(!!) (Good Value) 12AT7 Telefunken Fisher Diamond Bottom used/very good 1964 (10ma/12ma) (Highest mA and Gm)
(!!) (Good Value) 12AT7 Telefunken Diamond Bottom used/good 1960's (8.2ma/10.4ma)
(!!!) (Best Value Single) 6201=12AT7 GE Hewlett Packard NOS 1968 (8.2/9.6ma)
(!!!!) (Best Overall Single) CV4024=12AT7WA Brimar NOS square black plates 1966 (11.2./11.4ma)