(!!!!) (Recommended Single) CV181=ECC32 Mullard black base gray plates like new 1950's (5.2/5.3ma) (close Gm)
(!!!!) (Best Sylvania Pair) 6U8A Sylvania NOS 1970 era (17.0/16.4ma and 10.2/10.4ma)
(!!!!) (2nd Best Siemens Single) ECC83=12AX7 Siemens Halske NOS 1966 (1.0/1.1ma) (Gm=1550/1600)
(!!!!) 6AK5 GE NOS 1973 (10.2ma)
(!!!!) 76 RCA Cunningham used/good 1930's (4.8ma)
(!!!) (#1 19J6 Pair) 19J6 RCA "U" getter halo NOS 1952 same date codes
(!!!) (#1 286A) 286A Western Electric "top printing" NOS 1942-1945 (7.0ma)
(!!!) (Best tipped top pair) 448A Western Electric tipped top used/tests like new 1965 (35.5ma and 36.4ma) (Matched on Amplitrex)
(!!!) (#1 56 National Union Pair) 56 National Union rebranded Western Electronics NOS 1940's (5.0ma and 5.2ma)
(!!!) (Best Single) 6922 Amperex PQ USA 1967 NOS (13.6ma/16.8ma)
(!!!!!) (Best Overall Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (best sound)
(!!!) (#1 6BX7GT RCA single) 6BX7GT RCA NOS 1961 (41/48ma)
(!!!) (Recommended Pair) 6C4WA GE JAN NOS 1971-1973 (8.8/9.0ma) 1-2% matched
(!!!) (Best Pair) 6DJ8 Philips ECG USA by Sylvania NOS 1987 (18/20ma and 16.5/18.5ma)
(!!!) (Recommended Pair) 6DJ8 GE NOS coated glass 1975-1978 (19.8/19.2ma and 17/19.8ma) (smooth and warm)
(!!!) (Good Value Pair) 6SL7GT GE NOS round chrome plates 1969 (1.8/1.9ma and 1.9/2.0ma) (same Gm)
(!!!) 6SN7GT Raytheon parallel plates NOS 1953 (8.5/10ma)
(!!!) (#1 6SN7WGTA) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 tilted glass (7.6/7.6ma) 1% section balance
(!!!) (Mullard Pair) 7247 Mullard Bogen UK 1965 like new (1.3/1.3ma and 11.4/11.5ma) (BEST SOUND)
(!!!!) (Best Single) ECC33 Mullard gray plates "D" getter halo NOS 1961 (9/9ma) 1-2% section balance
