as for the preamp tubes- i sell Jolida / Black Ice Audio gear. I have found that Gold Lion gold pin 12at7 tubes add some bass, and Tungsol gold pin 12ax7 tubes seem to be better than the Gold Lion gold pin 12ax7 tubes. More clarity in the upper end. Also found that Tungsol EL34B tubes are great. Those really add some bottom end. And Tungsol tubes are reliable and last. If ever interested in Black Ice Audio / Jolida Audio gear let me know. Mention Audigon forums for a good deal.