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(!) (Best Single) 12AV6 Sylvania NOS (1.1ma Gm=1500)
(!!!!!) (Best Pair #2) 12AX7=ECC83 Philips Holland NOS 1966 and 1971 (1.8/1.7ma and 1.6/1.8ma) (Highest mA and Gm)
(!!!) (Recommended Single) JAN-5751 GE double mica gray plates NOS 1981-1982 (2.3/2.7ma)
(!!!) (Best Pair) 5751 GE double mica gray plates NOS 1979-1981 (2.4/2.5ma and 2.3/2.6ma) 1-3% matched (Close Gm)
(!!!!) (Best Single) E88CC=6922 Telefunken Germany <> bottom NOS 1962 (16.4/17.5ma) (mic grade)
(!!!!!) (Pair) JAN-7308 Sylvania used/good 1975-1976 (10.8/14.8ma and 13.2/12.0ma) (best 6922 substitute)
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
(!!!!) (BEST SINGLE) 201-A Silvertone Balloon NOS 1930 era (3.8ma and Gm=750)
(!!) (Best Sounding EF89) EF89=6DA6 Mullard UK NOS 1959 (7.5ma)
(!!!) (Best Single) ECC85=6AQ8 RCA Holland NOS 1968 (17.4/23.3ma) (Highest mA and Gm)
6AZ8 US Brands used/good (3 in stock)
6AZ8 RCA NOS (1 in stock)
6AZ8 RCA branded GE NOS (1 in stock)
6BC7 Sylvania branded RCA NOS 1950's (3 in stock)
6AC10 GE NOS rebranded various names (5 in stock)
6AC10 Sylvania NOS (3 in stock)
6AC10 GE branded RCA NOS (1 in stock)
236=36 Silvertone Balloon used/good 1930 era (54/26)
14F7 Sylvania gray plates like new 1949-1950 (97/60 and 98/60)
14F7 Raytheon by Sylvania gray plates NOS 1952 (95/60 and 97/60)
