The Shuguang Black Treasure is a very nice tube. Excellent vocals, tight bass, and great bloom on that one. When new though sounded strange for a week and much better after a month so give it some time.Kentley wrote:Today I took the plunge and tried an old RCA 6SN7 in my ST-120 driver gain hole, using the adaptor discussed above, I really did not expect much, as this RCA had seemed a bit too weak and subdued in the SP-14. I have another Shuguang Treasure on order but I couldn't wait to test the arrangement. And YES - IT'S A WOWIE ZOWIE. There's a sense of depth that is new to me. Bass is way tighter, too.
A highly recommended mod!
When you get a feel for the Black Treasure flip the ST-120 to Triode mode. You get more of everything good - bass, vocals, width, and depth.