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(!!!!!) (Best Single) ECC83=12AX7 Mullard UK branded Philips NOS 1967 (163 series) (1.2/1.3ma) (sweet sound) (Same Gm)
6SH7GT National Union NOS 1940's rebranded Raytheon 1970 (8.2ma)
6SH7GT National Union NOS 1940's rebranded Raytheon 1970 (9.4ma)
6SH7GT National Union NOS 1940's (11.5ma)
(!!!!) (Best Pair) 6J5GT Raytheon metal base black ribbed plate NOS 1940's (9.0ma and 9.4ma) (same Gm)
(!!!!) (Best Pair #2) 6J5GT Raytheon metal base black ribbed plate NOS 1940's (8.0ma and 8.2ma) (same Gm)
57 Cunningham used/tests like new 1930's (56/31)
57 RCA Radiotron used/tests like new 1930's (59/31)
57 RCA Cunningham used/good 1930's (44/31)
57 RCA Radiotron used/tests like new 1940 era (56/31)
