(!!!!) (Best Siemens Pair #1) E81CC=6201=12AT7WA Siemens Munich Germany NOS 1977 (12/13ma and 12/14ma) (High Ma and Gm)
(!!!) (Single) ECC85 Siemens Germany NOS 1962 (9.5/8.2ma)
(!!!) (BEST PAIR - BEST SOUND) EF804 Telefunken gray shield NOS 1968 (3.0/3.0ma) 1-2% matched
(!!!!) (Best Value Pair #2) 12AX7=ECC83 Telefunken Germany <> bottom branded GAP/R Computor tube <> bottom smooth plates used/good 1964 era (0.8/0.8ma and 0.8/0.8ma)
(!!!) (#2 19J6 Pair) 9J6 RCA NOS 1950's - 1960's same internal plate structure, different getter halo shape
(!!!) (Recommended PAIR) 6C4WA GE JAN NOS 1971-1973 (8.4/8.4ma) 1% matched
(!!!) (Recommended Pair) 6DJ8 GE NOS 1964-1965 (smooth and warm)
(!!!) 76 RCA NOS 1940's (4.5ma)
(!!!) 76 RCA NOS 1940's (6.0ma)
(!!!) (Best GE Pair) 12AZ7A GE gray plates NOS 1970's (10.6/10.0ma and 11.2/9.8ma)
(!!!) (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)
(!!!) (Best 12AT7WC Single) JAN-12AT7WC Sylvania black plates NOS 1978 (9/10ma)
(!!!) (Best 6112 Pair) 6112 Philips JAN 1980's (.7/.7ma and .7/.8ma) 1-2% matched (Audio Note, Musical Fidelity)
(!!!) (slightly microphonic) 12AU7A Westinghouse black plates "D" getter halo 1964 NOS (9.6/10.6ma) (similar to RCA black plates)
(read review) 12AY7 GE branded RCA gray plates "D" getter NOS 1954 (2.3/2.9ma)
(!!!) (Best 5-Star) 5814A=12AU7 GE Electronic Secretary "5 STAR" triple mica NOS 1960 (10.8/10.4ma) (Same Gm)
(!!!!) (Best Value Quad) 56 National Union rebranded Western Electronics NOS 1940's (5.5/5.5/5.6/5.9ma) (matched quad)
(!!!) (BEST MULLARD PAIR) ECL82=6BM8 Mullard UK NOS one tube branded Dumont 1966 (2.0/32ma and 2.2/31ma)
(!!!) (Best Mullard Single) ECF80=6BL8 IEC Mullard UK NOS 1966 (16ma/12ma) (Highest mA and Gm)
(!!!) (Recommended Pair) 6SC7 GE metal can NOS 1969-1977 (1.7/1.9ma and 1.6/1.8ma) (same Gm)
