I'm in need of a set of power tubes in the EL34 family to try out in my amp.....NOS choices are just too much money so they're out. I'm currently leaning toward the KT77's as I understand they sort of split the baby with the lushness of the EL34 and the slam of the KT88's (but who the hell knows until/unless you try them all). I'm forever seeking a balance of a bit of warmth/lushness with good air and detail but without any harshness. I've managed to find it in various forms with carts, phono pre's and in my Rogue CM2 via tube rolling the small signal tubes. I'd like to find the same for this amp (Leben CS600). For a KT77 option, I've heard where the JJ KT77's have had issues with reliability (read some horror stories) but also have read where these issues were limited to the early runs (although Upscale still mentions them) but sound pretty damn good. Other option here is the Gold Lion KT77 which seems generally reliable but I've read mixed reviews on sound qualities with some describing it as lifeless and others as perfect (again, personal preferences abound). For the EL34s, how do people like the the new production Mullards? Price is certainly a factor in their favor. I see some are using the RFT NOS tubes but know nothing about them and they're $300+. Then there's the Chinese tubes from Psvane and Shuguang but the fancy ones get very expensive. The Psvane EL34PH are said to sound like the NOS Mullards but they're $400 per quad. Shuguang Treasures are also $400. Would appreciate people's thoughts generally on these choices especially if you have compared a few of the choices above in your own systems and can speak to the differences. I know it depends on many factors but comparisons are most valuable.