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8FQ7/8CG7 Sylvania Silvertone used/good 1969 (5.6/6.2ma)
(!!!!) (Best Pair) 6FQ7 GE NOS 1960's (7.5/8.0ma and 7.0/7.2ma) (Close Gm) 1-5% matched
(!!!!) (Best Pair) 6FQ7 Zenith by GE NOS 1977 (7.2/8.0ma and 7.0/7.8ma)
(!!) (Recommended Pair) 6SK7 Sylvania NOS 1950 era (9.2ma and 9.0ma)
(!!!) (Recommended Pair) 6GK5=6FQ5A Toshiba Japan rebranded Raytheon NOS (8.7ma and 9.7ma)
(!) (Best Single) 6GK5=6FQ5A Sylvania branded Raytheon NOS (15.2ma)
(!!!) (Good Value Pair) 6GK5=6FQ5A Sylvania rebranded Raytheon NOS (8ma and 8ma)
(!!!) (Recommended Pair) 6GK5=6FQ5A Sylvania rebranded Raytheon NOS (11.0ma and 11.4ma)
(!!) (SINGLE) 12AT7 US Brands used/good
(!!) (Good Value) 12AT7 Telefunken Germany <> bottom used/good 1960's no printing (7.6ma/7.6ma) 1-2% section balance
(!!) (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)
1A7G Philco used/good 1940's (read review)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
3S4 Tungsol NOS 1944 (101/60)
(!!!) (Best Value Single) JAN-CKR-6SJ7 Ken Rad NOS 1944 (2.5mA)
(!!!) (Best Single) 6SJ7 GE NOS 1953 (3.4mA)
12SQ7 GE metal can NOS 1964 (94/60)
12SA7GT Nat. Union branded FORD MOTOR CO. used/strong 1940's (4.2ma Gm=1200)
12SA7GT Mullard Holland used/good 1960 (3.8ma)
