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(!) (Good Single) 6SN7GTB Westinghouse USA gray plates "O" getter halo NOS 1961 (8.0/9.4ma)
(!) (Good Value) 6SN7GTB CBS black base black plates side-getter NOS, the same shape as Sylvania 6SN7GTB 1960 (6.8/7.2ma)
(!) (SINGLE) 6SN7GT Westinghouse USA black plates NOS 1950 era (6.4/6.8ma)
(!) (SINGLE) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7.8/6.4ma)
(Read Review) 6SN7GTB GE NOS 1968-1974 (Schiit)
(slightly microphonic) 6SN7GTA GE NOS 1952 copper grid posts (7.4/10ma)
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)
