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(!!!) (Best GEC Single) KT66 GEC UK branded IEC Mullard low hours/tests like new 1971 (90.6ma)
(!!!) (Single) KT66 Osram UK black base used 1950's (57ma) (Gm=60%)
(Display Tube) KT66 GEC 1960's (WEAK TUBE: LOW Ma and LOW GM) - for display purposes only
(Display Tube) KT66 GEC 1971 purple gas - for display purposes only
KT66 GEC UK brown base used/70% 1966 (64ma)
