(!!!!!) (Best Tungsol Pair) 5881 Tungsol 1960-1967 like new and used - same build (66.2ma and 66.5ma)
(!!!!!) (Recommended Pair) 5881 GE Canada NOS 1966-1967 (65.2ma and 68.5ma) (same build as Tungsol)
(!!) (Best Pair) 0B3 Sylvania NOS 1940's (argon)
(!!) (Best Pair) 0B3=VT-184 Sylvania NOS 1943-1944 (argon)
(!!) (Good Value Single) JAN-CG-6SN7GT GE NOS 1953 (9.6/8.5ma)
(!!) (Recommended Pair) 0B3 Sylvania NOS 1960's (argon)
(!!) (Recommended Single) 5881 GE Canada NOS 1970 (73ma) (same build as Tungsol)
(!!) (Recommended Single) 5881 GE Canada NOS 1970 (81ma) (same build as Tungsol)
(!) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7/10ma)
6L6GC GE tests like new 1964 broken center guide pin (87.5ma)
6L6GC GE Zenith low hours/like new 1960's in white box (61.5ma)