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6SK7 FM Co. by GE used/good 1951 (9.6ma)
6SK7 GE metal NOS 1977 in Sylvania box (8.2ma)
6SK7 Ken Rad metal can NOS 1950 (9.2ma)
6SK7 Ken Rad NOS 1943 (9.6ma)
6SK7 Ken Rad NOS 1950 (9.2ma)
6SK7 Raytheon NOS 1955 (8.5ma)
6SK7 Sylvania NOS 1951 (8.8ma)
6SK7 Sylvania NOS 1970 era (8.5ma)
6SK7GT National Union NOS 1950 smaller top getter (8.2ma)
6SK7GT Raytheon used/good/70% 1940's (6.6ma)
6SK7GT Sylvania used/good 1940's (7.3ma)
6SK7GT Tungsol used/good 1949 (6.8ma)
6SL7GT Brimar NOS black base black plates 1950's (2.2/2.4ma) (slightly microphonic)
6SN7GTA CBS NOS Black Ribbed Plates similar to RCA early 1950's (8.3/8.6ma)
6SN7GTB CBS black base black plates side-getter, the same shape as Sylvania 6SN7GTB used/good 1961 (7.5/8.0ma)
6SN7GTB RCA used good 1960's (6.4/8.2ma)
6SQ7 metal used/good (3 in stock)
6SQ7 RCA NOS 1950-1953 (0.8ma) (special price)
6SQ7 RCA NOS 1953 (0.9ma Gm=1400) (High Gm)
6SR7 US Brands metal can NOS (15 in stock)
