(!!!!) (Recommended Single) Z729=EF86 GEC UK NOS "O" getter halo 1960's (2.5ma)
(!!!) (Best Single) KT88 Genalex England NOS 1967 rebranded SC1000 Stromberg-Carlson (147ma)
(!!!) (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)
D717=6AL5 Genalex Gold Lion England NOS (sold out)
KT66 GEC UK brown base used/70% 1966 (64ma)