New tubes suggestions?

Hello tube gurus,

I have the Jolida 1000RC which come with Chinese made tubes would like to replace the tubes but since I am no expert in tube rolling I would like some suggestions. Thinking about changing the pre amp tubes and the regular EL 34 with KT77 however I dont know which brand to use that will yield the best performance and musicality. Also, I have the JD 100 Cd player as well. Lastly, any advise on cryo tubes?

Any suggestions will be greatly appreciated, thanks in advance!