(!!) 6FQ7 RCA clear top NOS 1976 (7ma/8ma)
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance
(Best Single) EC90=6C4 Mullard branded Philips UK box plate NOS 1967 (11ma)
6100=6C4WA GE 5 star triple mica NOS 1959-1960 (12.6ma) (Premium 6C4)
6550A GE stapled plates used/good 1980's (115ma)
6C4WA Sylvania NOS 1965 and 1971 (read review)
6CG7 Sylvania Emerson used/good chrome electrostatic shield between plates "U" getter 1957 (6.2/6.8ma)
6ES5 Sylvania rebranded GE NOS
6GK5=6FQ5A RCA NOS 1960's (13.6ma)
6GK5=6FQ5A Super Radiotron Australia NOS 1960's (9ma)
6GK5=6FQ5A Sylvania branded Raytheon NOS (11.4ma)
6GK5=6FQ5A Sylvania branded Raytheon NOS (12.5ma)
6GK5=6FQ5A Sylvania branded Raytheon NOS (13ma)
6GK5=6FQ5A Sylvania branded Raytheon NOS (15.2ma)
JAN-6550A GE NOS 1985-1986 slightly tilted glass (153ma)
