(!) (Recommended SINGLE) 6U8A Sylvania NOS 1960's (19.8ma/10.6ma)
(!!!!) (Recommended Pair) 6U8A Philips by Sylvania NOS 1986 (15.5/16.0ma and 8.4/8.0ma)
(!!) ECF82=6U8 Telefunken Germany <> bottom NOS 1968 (12.8ma triode and 8.2ma pentode)
