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(!!!) (Recommended Single) 6BZ7 RCA black plates "D" getter NOS 1957 (11.4/9.5ma)
(!!!) (Recommended Single) 6BZ7 RCA black plates "U" getter NOS 1957 (9.0/9.4ma)
(!!!) (Recommended Single) 6BZ7 RCA black plates large "O" getter NOS 1965 (13.0/14.2ma)
(!!!) 6BZ7 RCA black plates "U" getter NOS 1954 (9.6/12.2ma)
6BK7B Philco by Sylvania NOS 1960 (13.2ma/15.2ma)
