(!!!!!) (Recommended Pair) 5881 GE Canada NOS 1966-1967 (65.2ma and 68.5ma) (same build as Tungsol)
(!!!!) (BEST OVERALL PAIR) 5881 Tungsol NOS 1951 and like new 1950 (72.5ma and 70ma)
(!!!!) (Best Value Pair) 6L6WGB=5881 Sylvania NOS and like new same build 1970's (74ma and 75ma)
(!!!!) (Good Value Pair) 6L6WGB=5881 Sylvania and Philips JAN black base 1979-1986 (72ma and 73.4ma)
(!!!!) (Recommended Pair) 6L6WGB=5881 Sylvania NOS same build 1980 era (81ma and 84ma) (same Gm)
(!!!!) (Recommended used pair) 5881 Tungsol used/good 1960's (63.2ma and 66ma)
(!!!) (Best Pair) 5881 Tungsol rebranded Sylvania and GE 1960 era used/test like new (77.3ma and 74.5ma) (close Gm)
(!!!) (Good Value Pair) 6L6WGB=5881 Sylvania brown base NOS and used/like new (59ma and 61ma)
(!!!) (PAIR) 5881 Tungsol tests like new 1957 and 1963 with broken center guide pins - see photo (72.5ma and 68.2ma)
(!!!) (Recommended Pair) 5881 Sylvania black base NOS 1970's same build (65ma and 67ma)
(!!!) (Recommended Pair) 6L6WGB=5881 Sylvania black base NOS 1980-1987 same build (86ma and 91ma)
(!!!) (Recommended Single) 5881 Tungsol like new 1957 (86ma)
(!!!) 5881 Tungsol used/good 1957 (58ma)
(!!) (Recommended Single) 5881 GE Canada NOS 1970 (73ma) (same build as Tungsol)
(!!) (Recommended Single) 5881 GE Canada NOS 1970 (81ma) (same build as Tungsol)
(!!) (Recommended Single) 6L6WGB=5881 Sylvania branded GE NOS (65ma)
(!) (Recommended Single) 5881=6L6WGB GE NOS 1960's (72.5ma)
350C Shuguang China NOS (sub for 5881 or 6L6GC) (68.5ma)
5881 International Japan black plate NOS 1960's (70ma)
