(!!!) (Single) 7199 RCA Black Plates NOS 1970 era (10.6/8.6ma)
(!!) (Best Pair #1) 6K11=6Q11 GE NOS 1979 (1 pair)
(!!) (Best Value Single) 7199 Sylvania branded GE NOS 1966 (10ma/8.6ma)
(!!) (Recommended Pair) 6K11=6Q11 GE NOS 1979 (1 pair)
(!!) 7199 RCA Black Plates NOS around 1960 era (9/7.8ma)
(!) (SINGLE) 7027A RCA NOS 1971 (61.5ma)
(Single) 7868 Sylvania branded Philips NOS 1970 era (47ma)
6K11=6Q11 GE branded RCA NOS 1960's (88/60, 92/60, 90/60)
6K11=6Q11 GE branded RCA NOS 1960's (93/60, 97/60, 92/60)
6K11=6Q11 GE branded RCA NOS 1969 (88/60, 92/60, 90/60)
6K11=6Q11 US Brands NOS 1960's (8 in stock)
6U10 Sylvania branded Zenith used/good 1960's
7591 Fisher Westinghouse used/good/75% 1963 (43.5ma, Gm=7450)
7591 Tungsol used good 1963 (55ma, Gm=8100)
7591 Westinghouse branded RCA NOS 1963 (51.5ma, Gm=9050)
7591A Sylvania branded RCA coin-base NOS 1970's (63ma, Gm=10,000)
7591A Sylvania branded RCA used/75% 1968 (51ma, Gm=7,600)
7868 GE branded RCA NOS 1970's (62ma)
7868 RCA black plate tipped top NOS 1960 era (59ma)
7868 Sylvania NOS 1976 (71ma)
