To all you Cary SLI 80 owners, I'm looking for tube suggestions

@immatthewj My Cary V12 came with Rubys. At the time, I thought it was a great sound. I was under the impression that these were EL34s that were rebranded by Ruby? For some reason, and I may be wrong, at the time (’01) I was under the impression that the Ruby EL34s were Chinese?

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Shuguang EL34BSTR labeled as Ruby. I had them in my Cary V12R and liked them quite a bit. They sounded exceptionally good after I recapped the amp with Mundorf EVO Silver-Gold coupling caps. I liked them quite a bit actually. For sale here at Doug’s Tubes to get some ideas for comparison.

@immatthewj I recall Roger Modjeski telling me they are Shuguang made to mimic NOS Mullard sound quality.   @clio09 may want to weigh in to confirm.

I don't recommend Mullard re-issues, as I found them to be bland and soft when used in a Music Reference RM9.

@decooney and ​​​​​@pdreher , thanks for the helpful info on that.

I see that Cary lists a number of tubes you can use in the amp. KT66 is not one of them and I would not recommend trying them in an amp that boasts 40 wpc output in triode mode and 80 wpc in UL mode. You’re in danger of overheating the tubes and maybe damaging the amp. In my experience an EL34 will have more midrange emphasis and "warmth" than a KT88. I would suggest Svetlanas. Again, IME, they have the warmest midrange of any EL34s I’ve used. But I think that any quality EL34 will give you the extra warmth that you’re looking for.  The Shuguangs mentioned get very good comments and might be an option. 

I really loved the Gold Lion KT77 in my EL34 amp of the current modern offerings of EL34 tubes I thought it had the best tone and frequency response and overall excellent sound.