why don't you call cary?
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I thought I'd call Cary however I have to wait until Monday. In the past they have not been a great deal of help regarding other tubes. They have suggested to me, to stay with the tubes that the equipment comes with.
In the case of my 2A3 tubes, I have improved the sound greatly by using different 2A3 tubes.
yes, its a lot of people who don't pay attention to what kind of tubes their using. before you change, rolling your tubes you should check. the 6sl7 volt higher than 6sn7, that why most poweramp used 6sl7 and 6sn7 for preamp,if you can try to roll tube with 5691 tube it subtitle for 6sl7 also last longer and sound warm and hamonic anyway sound better for sure. good luck