Buy new tubes, or use "stock tubes?"


I'm considering purchasing a YS Audio Experience A2-SE. I have read reviews of different pieces, as well as different users and some say to replace the stock Chinese tubes with US or even Russian tubes. Does anyone have any experience with this matter. One member told me he replaced with RCA tubes, but heard no difference. As I said, I have heard this not just with the YS equipment, and not just Chinese tubes, but understand different brand tubes on different equipment can really change your sound. What about it ladies & gentlemen? One more thing: I read a review of the A2 SE and the owner said he was going through a set of tubes every 6 months!! In reviewing other tubed equipment, I understand it's not uncommon for a set of tubes to last years. (??)
handymann
Thanks for your response. AS I said-not familiar with tubes. Haven't had any since a stripped my folks old stereo 30 years ago. The A2SE has (2) 12AT7's and (1) 5687WB. I'm not familiar with either. Have heard of 12AX7's and they may interchange. Anyway, given what tube types this preamp has, know any better brand tubes for it?
12 AX7s are NOT equivalent to 12AT7s. They may "work" but they are not the same tube.
If you buy new stick with what they are shipped with while it is under the warranty. If anything does go wrong the first thing your dealer is going to ask is "What tubes you are using?". Also getting used to the stock Chinese tubes at first may just help you appreciate NOS tubes.

Have fun!
If you can find experienced users of your equipment that have established specific tubes that work well then by all means try them out.
Tube rolling is a lot fun...onced found the right tubes...it will change the sound dramatically.

Btw,ask experienced users of the same gear as yours as what Maineiac advised.Good luck.