I'm no tube expert, but I use Telefunken Black Diamond tubes (made by JJ) in my C2300 with good results. Before that it was JJ Hi-Performance Gold Pin tubes. The BDs have a good dynamic and frequency balance, and to my ears pretty neutral; the JJs are weighted toward the mid/low end and warm. Smooth on top with no harsh highs.
FWIW, Magnum Dynalab uses JJ tubes (6922s) in their tuners; I don't know which tube though.
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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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