(!!!!!) (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)
KT88 GEC England like new condition 1965 original box (125ma)
KT88 GEC England used/tests like new 1962 in white box (145ma)
