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(!!!!!) (Best Pair #2) 5687WA and 5687WB GE black plates like new 1970's (39/38.5ma and 37/41ma) (Highest Ma and Gm)
(!!!!!) (Best Single #1) JAN-5691 Philips by Sylvania black plates NOS 1985 (2.4/2.6ma) (Best 6SL7GT sub)
(!!!!!) (Best Single #2) JAN-5691 Sylvania black plates NOS 1979 (2.1/2.1ma) (Best 6SL7GT sub)
(!!!!!) (Best sound for the money) GZ34 Trigon Japan NOS 1970's (59/40 and 59/40) (LS300, Dynaco, Latino, Scott, Marshall, Fender, Cary)
(!!!!!) (Best sound for the money) GZ34 Trigon Japan NOS 1970's (60/40 and 60/40) (LS300, Dynaco, Latino, Scott, Marshall, Fender, Cary)
(!!!!!) (Pair) JAN-7308 Sylvania used/good 1975-1976 (10.8/14.8ma and 13.2/12.0ma) (best 6922 substitute)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (56-58/40 and 57-58/40)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (60-64/40 and 60-66/40)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
(!!!!) (2nd Best Amperex PQ Single) 6922 Amperex PQ USA NOS 1962 (14.5/16.2ma) (Audio Research, Nova)
(!!!!) (2ND BEST RCA PAIR) 6EU7 RCA NOS 1970-1972 (44-50/32 and 43-49/32)
(!!!!) (3rd Best Pair 1968) PCC88=7DJ8 Philips Holland "O" getter NOS 1968 (13.2/10.4ma and 10.4/11.2ma) (sweet sound)
(!!!!) (Best Overall Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (49/40 and 49/40 x 2 tubes) 1% matched
(!!!!) (Best Pair #1) 12AU7A RCA clear top NOS 1963-1964 (8.4/8.6ma and 8.2/8.4ma) (Close Gm matching) (Best audio grade 12AU7)
(!!!!) (Best Pair #1) 12AU7A RCA USA NOS "TOP GETTER" (10/10.4ma and 10.4/10ma) 1-2% matched (similar sound to clear top) (Best USA made 12AU7)
(!!!!) (BEST PAIR #1) 6DJ8 Philips by Matshushita JAPAN NOS 1960's (18/19ma and 17.7/18.4ma)
(!!!!) (BEST PAIR #1) 6DJ8 Philips by Matshushita JAPAN NOS 1960's (19.8/18.9ma and 18.2/19.5ma)
(!!!!) (Best Pair #2) 6BQ5 GE NOS 1966-1980 same build (58.5ma and 60ma)
(!!!!) (BEST PAIR #2) 6DJ8 Philips by Matshushita JAPAN NOS 1960's (15.7/14.9ma and 15.0/14.2ma)
(!!!!) (Best Pair #2) 6GH8A GE by EI Yugoslavia NOS copper grid posts 1970's (16.8/12.8ma and 16.0/13.5ma)