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(!!!) (BEST PAIR) 7247=12DW7 CBS gray ribbed plates NOS 1960 (0.9/8.8ma and 0.9/8.6ma) 1-3% matched
(!!!) (Best RCA Pair) 6BQ5 RCA NOS 1960's - 1970 (55ma and 58.5ma)
(!) (Best Single) 7247=12DW7 Amperex Globe Logo by Matsushita Japan NOS 1967 similar sound to Mullard (1.5ma and 11.6ma) (High mA and Gm)