(!!!!) (Best Tungsol Pair) 5881 Tungsol brown base NOS 1970-1971 (65ma and 66ma)
(!!!!) (Recommended Pair) 6L6WGB=5881 Sylvania JAN black base NOS 1979-1987 same build (72ma and 73ma) 1-2% matched
(!!!) (Good Value) 6L6WGB=5881 Russian made wafer-base used/good 1990's (58ma and 62ma)
(!!!) (~ Recommended Single ~) 5881 Tungsol NOS 1950's (66ma)
(!!!) (~ Recommended Single ~) 5881 Tungsol NOS 1960 (60ma)
(!!) (#2 5881 Brown Base Pair - Best Value) 5881=6L6WGB Sylvania 1971-1973 (92ma and 96ma)
(!) (#1 5881 Pair) 5881 Sylvania black base NOS 1970's - 1980 (85ma and 85ma)
(!) (#2 5881 Brown Base Pair) 6L6WGB=5881 Sylvania brown base NOS 1960's (68ma and 73ma)
(!) (#4 5881 Pair) 5881 Sylvania black base rebranded GE and RCA NOS 1979-1980 same build (74.5ma and 79ma)
(!) (#4 5881 PAIR) 6L6WGB=5881 Sylvania black base NOS 1975 (72ma and 75ma)
(!) (Recommended Single) 5881 GE NOS 1964 (65ma)
5881 International Japan black plate NOS 1960's (70ma)
5881 Tungsol rebranded GE used/very good 1950's (74.5ma)
