(!!!!!) (Best KT88 Gold Lion Single) KT88 Genalex Gold Lion England NOS circa 1960 in original box (155ma) (1 TUBE ONLY - NO PAIRS OR QUADS)
(!!) 6550A GE stapled plates NOS around 1980 (118.5ma)
(!) 6550 Sylvania branded RCA used/tests like new 1984 (134ma)
(!) 6550 Sylvania used/tests like new 1970's no printing (132ma)
6550 Sylvania branded RCA used/good 1977 (122ma)
6550 Sylvania branded RCA used/good 1979 (112ma)
6550 Sylvania used/very good 1970's rattle inside base (126ma)
6550A GE used/60% 1970's "welded plates" (82ma)
