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(!!!!) (Recommended Pair) 5751 RCA black plates low hours/test like new 1961-1962 (2.5/2.5ma and 2.7/2.4ma) (Best Audio Grade 5751) (same Gm)
(!!!!) (Slightly microhonic Single) 5751 RCA Hewlett Packard black plates NOS 1968 (2.4/2.6ma)
(!!) 5654=6AK5 RCA Command Series black plate NOS 1968 (6.8ma)
(slightly microphonic) 5670 RCA NOS triple mica "O" getter halo 1961 (7.6/10.8ma)
6AK5 Westinghouse NOS 1970 (5.8ma)
6AK5 Westinghouse NOS 1970 (6.6ma)
