(!!!) (Single) KT66 Osram UK brown base used/good 1950's rattle inside base (67ma)
(!!) KT66 GEC UK used/good 1962 missing guide pin (79.6ma)
(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)