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(!!!) (Best Single) 12AT7=ECC81 Siemens Halske Germany branded Telefunken Tektronix Checked NOS 1970 (8.6ma/9.8ma)
(!!!) (Best used single) 12AT7 Telefunken Diamond Bottom used/good 1960's (10.0ma/10.8ma)
(!!!) (Best Value Pair) 12AT7=ECC81 RFT East Germany NOS 1970's (10.0/9.6ma and 10.4/9.6ma) 1-2% matched
(!!!) (Best Value Single) 12AT7=ECC81 Siemens Halske Germany branded Telefunken NOS 1961 (12.2ma/10ma)
(!!!) (Good Value Single) ECC81=12AT7 Mullard old logo made in Hyperlec Brive France used/good (8.4/9.8ma)
(!!!) (Recommended Mullard Pair) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1973 (9.6/8.4ma and 9.0/9.4ma) (Jolida, Fender)
(!!!) (Recommended Mullard Pair) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1976 (10.5/10.0ma and 10.4/9.2ma) (very close Gm) (Jolida, Fender)
(!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1971 (7.2/8.0ma and 7.6/6.6ma) (close Gm)
(!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1974 (10.5/7.5ma and 10.8/8.2ma)
(!!!) (Recommended Single) 12AT7 Fisher Telefunken Germany <> bottom NOS 1964 (7ma/11ma) (recommended for mic)
(!!!) (Recommended Single) 12AT7 Fisher Telefunken Germany <> bottom NOS 1964 (9ma/6.5ma) (recommended for mic)
(!!!) (Single) 12AT7 GE gray plate NOS 1961 (11.4/14.4ma)
(!!!) (Single) 12AT7 GE gray plate NOS 1975 (8.4ma/6.8ma)
(!!!) (Single) 12AT7 GE gray plate NOS 1981 (8.4ma/6.8ma)
(!!!) (Single) ECC81=12AT7 Telefunken Germany <> bottom NOS 1963 (6.8ma/7.6ma) (recommended for mic)
(!!!) (slightly microphonic single) ECC801S Telefunken <> bottom rebranded 12AT7/ECC81 Telefunken NOS 1962 (9.2ma/10.2ma)
(!!!) 12AT7 RCA gray plates NOS 1960's (8.6ma/10.4ma)
(!!) (Best GE Single) 12AT7=6679 GE NOS 1978 (10ma/10.1ma) 1-2% section balance
(!!) (Best used single) 12AT7 Telefunken Diamond Bottom used/good early 1960's (9.0ma/9.4ma)
(!!) (Best Value Single) M8162=CV4024=12AT7WA Mullard UK NOS 1966 (8/7ma)
