(!!!!!) (Best Overall Single) 7199 RCA black plates NOS 1959 (13.5ma pentode / 9.2ma triode) (rare from 1959) (Highest Gm)
(!!!!!) (Best Overall Single) 7199 RCA black plates NOS 1960's (14.2ma pentode / 9.6ma triode) (Highest Gm)
(!!!) (Best RCA Single) 7199 RCA Daystrom black plates NOS 1963 (14.5ma pentode /9ma triode)
(!!!) 7199 Sylvania branded GE NOS 1968 (11.5/6ma)
(!!) (Best Sylvania Single) 7199 Sylvania branded Westinghouse NOS 1962 (14.5ma pentode, 8.8ma triode)
(!) (Best Sylvania Single) 7199 Sylvania NOS 1960's (14.2ma pentode, 6ma triode)
(!) 7199 RCA Black Plates branded GE NOS 1970 (13ma/6.4ma) (triode 70-75% Gm)
7199 RCA Black Plates used/good 1960's (8.5ma/6.4ma)
7199 Sylvania used/good 1960's faded printing (13ma pentode/6ma triode)
