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(!!!) (Single 1956) 12AY7 GE "D" getter like new 1956 (3.1/2.8ma)
(!!!) (Single) 6072 RCA gray plates used/good 1971 (2.0/2.2ma) (Fender, Apex)
(!!!) (Single) 6072 RCA gray plates used/good 1971 (2.3/2.7ma) (Same Gm) (Fender, Apex)
(!!) JG-12AY7 GE "D" getter 1956 used/good (2.1/2.3ma)
(read review) 12AY7 GE branded RCA gray plates "D" getter NOS 1954 (2.3/2.9ma)