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6SJ7 GE used/like new 1966 (3.3ma)
6SJ7 RCA metal can like new 1964 (3.5ma)
6SJ7 RCA used/good 1940's (2.8ma)
6SJ7 US Brands used/good (40 in stock)
6SJ7Y=VT-116B RCA used/tests like new 1943 (3.8ma)
6SJ7Y=VT-116B Sylvania brown bottom like new 1940's (3.7ma)
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)
