(!!!!!) (Recommended Single) KT88 GEC UK used/tests like new 1960's (137.6ma, Gm=10,800)
(!!!) (Best Single) KT88 Genalex England NOS 1967 rebranded SC1000 Stromberg-Carlson (147ma)
(!) (#1 KT77 Gold Lion single) KT77 Gold Lion by M-O Valve UK brown base NOS (7903=1979) (113.6ma) (Gm=13,100)
(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
KT88 GEC England like new condition 1965 original box (125ma)
KT88 GEC England used/tests like new 1962 in white box (145ma)
