(!!!!) (Recommended Single) 7199 RCA black plates NOS 1960's (12ma pentode / 6.6ma triode)
(!!!!) (Recommended Single) 7199 RCA black plates NOS 1960's (19.5ma pentode / 8ma triode)
(!!!) (Best RCA Single) 7199 RCA Black Plates NOS 1966 (11.2/13.8ma)
(!!!) (Best RCA Single) 7199 RCA Black Plates NOS 1966 (14/7.2ma)
(!!!) (Single) 7199 RCA Black Plates NOS 1964 (10.2ma pentode, 12ma triode)
(!!!) (Single) 7199 RCA Black Plates NOS 1970 era (10.6/8.6ma)
(!!) 7199 RCA Black Plates NOS around 1960 era (9/7.8ma)
6KV6A GE NOS (38.5ma)