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(!!!!!) (Recommended Pair) 6DJ8 Sylvania NOS 1970-1972 era (15.2/17.2ma and 13.5/17.4ma) (good detail and smooth)
(!!!!) (Best Pair #1) 6DJ8 Philips ECG USA by Sylvania NOS 1987 (18/20ma and 16.5/18.5ma)
(!!!!) (Best Pair 1963) 5U4GB GE NOS 1963 same date codes (60-62/40 and 60-60/40 x 2 tubes)
(!!!!) (Best Pair) 6DJ8=ECC88 Philips by Sylvania NOS 1987 and Sylvania 1973 same build (20/23.6ma and 21.6/22.6ma) (highest mA and Gm)
(!!!!) (Best Value Pair #2) 6DJ8 Philips ECG USA by Sylvania NOS 1987 (13.5/18.5ma and 13.5/19.0ma) 1-3% matched
(!!!!) (Best Value Pair) 6L6WGB=5881 Sylvania NOS and like new same build 1970's (74ma and 75ma)
(!!!!) (Best Value Single) JAN-6DJ8=ECC88 Philips by Sylvania NOS 1987 mismatched sections (10/16ma)
(!!!!) (Good Value Pair) 6L6WGB=5881 Sylvania and Philips JAN black base 1979-1986 (72ma and 73.4ma)
(!!!!) (Single) 6DJ8=ECC88 Sylvania JAN NOS 1975 (19/24.5ma)
(!!) (Best Value Single) JAN-6922 Sylvania NOS 1971 tilted glass (19.0/17.2ma)
6528A Cetron used/good 1987 (112/113mA)
