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(!) JG-12AT7WA=6201 GE black plates triple mica "U" getter used/strong 1955 (10ma/15ma)
(!) JG-12AT7WA=6201 GE NOS gray plates 1963-1964 (7ma/7.2ma)
(slightly microphonic) 6201=12AT7 RCA black plates NOS 1976 (11/12.4ma)
12AT7WA=6201 GE NOS gray plates 1965 (7.8ma/10.6ma)
6201=12AT7 GE "5 STAR" used/good triple mica "U" getter halo, copper grid posts, gray plates, 1957 (6.2/7.8ma)
