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I have used a pair of these tubes with another pair of 12AU7, on a Yaqin MS 110b. I'm not a pro but the sound was exactly like a transistor amp !(a Quad 405...with more hssss) For some it could be good ! i believe that. For me, and because the issue was on KT88 in fine, i have rolled back to the shuguang tubes, really better. I have kept the quad KT88 from JJ, they are good.
