I had a pair of 12AX7 Black Diamonds in my C2300 preamp; took them out last night. Except for the fact that they weren't too helpful with the brightly-recorded older stuff I sometimes play, I thought they were pretty good. They're brighter than the JJ ECC803s (everything I've tried is), but the BD's lower frequencies were nice. Not quite as robust as the JJ's, which is a bit forward, but satisfying nonetheless.
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SOTA, Grado, SME, Van den Hul, Gingko turntable setup; Pioneer Elite LD, BDP; Sony OLED TV; Magnum Dynalab tuner, antenna; MIT S-video cable; Pangea HDMI cables; DVDO video processor; McIntosh SACD, preamp, power amps; Telefunken Black Diamond preamp tubes; Kimber IC; Transparent IC, PC, SC; Mirage speakers; PS Audio, Shunyata PC; Audio Additives RCA caps; Furman power conditioning; Sanus: racks
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