zuzu Posted March 8, 2007 Share Posted March 8, 2007 I'm looking at 6DJ8 Jan Sylvania Tubes For My Audio Research SP 11 pre amp. Which are better for a pre amp the black or grey and why. The SP 11 does not need matched or low noise tubes but does need high conductance so the manual says. What is the significance of high conductance? Quote Link to comment Share on other sites More sharing options...
zuzu Posted March 8, 2007 Author Share Posted March 8, 2007 I found out from an expert [Dale] at www.vacuumtubes.net that both grey and black plate tubes just sound different. Some people like the sound of grey but more people like the black better. It's interesting that most sellers never distinguish between the two. The color is invisible!!! Live and learn. Boy there are a lot of people selling tubes. Without trying I came across 20 or more. Quote Link to comment Share on other sites More sharing options...
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