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(!!!!) (Best Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
(!!!!) (BEST PAIR) 6F8G=VT-99 Raytheon NOS 1945 era (8.6/10.2ma and 9.8/9.0ma)
(!!) 12AT7WC Raytheon NOS black plates triple mica 1975 (7/11ma)
(!!) 5842 Raytheon branded RCA NOS 1976 (20ma and Gm=20,000)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
(!!!) (Best Pair) CK-5755=420A Raytheon clear top NOS 1965 (1.8/1.9ma and 1.8/2.0ma)
(!!!!) (BEST GE PAIR #3) 5687WB GE NOS rebranded CK-5687WB Raytheon black plates 1970's (Audio Note, Manley, Modwright) (35.8/37.5ma and 34.6/36.2ma)
(!!!!) (Best Single) CRP-6CG7 Raytheon black plates and black electrostatic shield and "O" getter halo 1962 (8.0/8.8ma)
(!) (~ Recommended Pair ~) 6HQ5 Sylvania branded Raytheon NOS 1970 era same build (13.2/14.6ma)
(!) (~ Recommended Pair ~) 6HQ5 Sylvania NOS 1970 era same build (12.5/13ma)
(!) 12HG7=12GN7A GE USA NOS (52ma and 56ma)
(!) 12HG7=12GN7A GE USA NOS (62ma and 66ma)
(!) 12HG7=12GN7A GE USA NOS (71ma and 68ma)
(!!) (Best Value Single) JAN-CRP-5687 Raytheon black plates used/very good around 1960 (33.5/37.6ma)
(microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1956 (36/41ma)
(microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1957 (31/31ma)
(slightly microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1956 (40.5/45.5ma)
(slightly microphonic tube) JRP-5687 Raytheon NOS black plates D getter NOS 1957 (34.5/36.5ma)
(slightly microphonic - good value) 5687 Raytheon black plates NOS "square" getter halo 1950's (37/39ma) (strong Ma and Gm)
