(!!!!) (Best Single) 12AX7 Telefunken Germany smooth plates branded DYNACO like new 1965 (Gm=1600/1800)
(!!!!) (Best Sylvania Single) 7199 Sylvania branded Westinghouse NOS 1962 (14.5ma pentode, 8.8ma triode)
(!!!!) (Recommended Single) 7199 RCA black plates NOS 1960's (12ma pentode / 6.6ma triode)
(!!!) (Best RCA Single) 7199 RCA Black Plates NOS 1966 (14/7.2ma)
(!!) (Best Pair) 7199 Sylvania NOS 1960's and 1985 same build (12.5ma/9.6ma and 12.3/10.2ma) 1-3% matched
(!!) (Best Sylvania Single) 7199 Sylvania NOS 1960's (11.6ma pentode, 10.2ma triode)
(!!) 7199 RCA Black Plates NOS around 1960 era (9/7.8ma)
12X4 Automatic Radio by RCA black plate used/good 1950's (47/40 and 49/40)
