Which tubes are the best?


Hi folks, I just got a Muzishare X7 integrated amp. It is beautifully made and sounds like it has a lot of promise. Even though I'm just breaking it in, I am thinking about tube changes. Why? It's just what I do. 
I'd like your opinion on the best replacement tubes, meaning smoothest, most "tubby" and mellow tubes. 
I won't be chasing NOS tubes. I'd like your experience with Gelenlex Gold Lion, TungSol, Mullard, Telefunken, or?,  etc. of current manufacture. The amp uses KT88, 12ax7, 12au7 and CR34 rectifier. 
Any thoughts about KT88 vs 6550 would be appreciated. I used to prefer 6550 way back when. 
Any information would be appreciated. Yes, I could go through all the old posts but I do have vision issues after four operations and that's why I'm asking straight out. 
Thanks in Advance. 
Back in the day, I used to do some serious tube rolling. The absolute mellowest, most laid back and detail rich tubes I ever found were some Mullards advertised in the back of Audio magazine. They had Magnus Organ printed on them. They were amazing. Unequalled. Ten years ago, I was cleaning out stuff and took a box of my small tubes to a local dealer. Some guy gave me $350 for them. Wish I still had them heh. 

fredcdobbs
FWIW, I've been using Tung Sol 6550's for quite a few years. They are a good match with my system, better than a lot of other KT88/6550's I have on hand. Out of curiosity I tried a set of the JJ KT88. I found them very smooth but a bit warn for my taste. Nice tube though.
I believe Muzishare comes off the same line as Line Magnetic. So that’s really good news right off the bat.

For now, I’d wait for the tubes to break in. Good thing is that it runs a single quad of KT-88s

I would try the Suguang WE KT-88 Plus. They sounded great in my Don Sachs Kootenay and was highly recommend by the man himself.


IME rolling tubes generally makes for a huge upgrade in the sound.
Tube Depot is a decent source for good NOS. But I recently have bought and used several new Psvane (how the hell do you pronounce that!). They have introduced several lines of tubes which have been carefully tested and they toss 90%. These can get a bit pricey but I have found Themis to be super. Grant Fidelity is the best source for the best ones. Cool to get new, new stock.
Another vote for Psvane 12AU7 tubes. I have used Gold Lions. But the Psvanes bettered them. Both are better than the new Mullards in my system. I got mine from Viva Tubes. They have an online shop and have fast shipping.