(!!!) (Recommended Pair) 12BZ7 National Union branded Admiral and Sylvania "U" getter NOS 1960-1961 era (1.6/1.6ma and 1.7/1.8ma)
(!!!) (Recommended Pair) 12BZ7 RCA NOS 1964 and 1968 (1.8/1.8ma and 1.8/1.9ma)
(!!!) (Recommended Single) 12BZ7 RCA gray plates branded Tungsol NOS 1960's (2.0/2.1ma) 1-2% section balance
(!!) (slightly microphonci single) 12BZ7 RCA gray plates NOS 1960's (2.0/2.3ma)
(slightly microphonic) 12BZ7 CBS NOS rebranded Westinghouse early 1950's large D getter (2.4/3.3ma)
