I have had very good sound with 6h8c's from Upscale Audio. (Russian variation of 6ns7) - works with my system! By the way, Cary AE-3 DJH is a fine pre-amp.
6SN7 & 6CA4 Tube Recommendations for Cary AE-3 DJH
Would like to hear from all you tube rollers out their regarding different brand tubes used in Cary's AE-3 DJH preamp. Let me know what you tried, liked, & didn't like. I just got this preamp used and it came with Westinghouse 6SN7GTB & Valvo EZ80. I have a TV-7 tube tester I'll check them on this weekend before I fire up the preamp.