(!) (PAIR) 6C8G Coronado by NOS 1940's (3.2/3.3ma and 2.8/3.0ma)
(!) (Recommended Pair) 6C8G Raytheon NOS 1940's - 1 tube branded Tungsol (3.6/3.8ma and 3.3/3.8ma)
(BEST SINGLE) 6C8G RCA Radiotron NOS 1940's (3.8/3.9ma) 1-3% section balance
6C8G CBS NOS 1950's (like RCA) (3.7/4.1ma)
6C8G National Union NOS 1950 era (3.6/5.8ma)
6C8G National Union NOS 1950 era (3.8/3.7ma)