Tube upgrade options for Dodge 8 preamplifier?

We recently purchased a Dodge 8 tube preamplifier:

The Dodge 8 comes with (4) 12AT7 and (4) 12AX7 Chinese tubes. I've read Chinese tube are not great sounding because they tend to be too bright.
Any thoughts on this?

Also, the recommended tubes for the Dodge 8, according to reviewers, are NOS RCA 12AT7's and 12AX7's; much warmer sound.
Would you agree or disagree?

All suggestions are accepted and appreciated.

NOS can be hit or miss especially if you are inexperienced.
Try these.
To answer your question about the RCA tubes. Obviously, there are many variations. I have found them okay but flawed. They seem a little constricted. If they were a wine, they'd be Malbec.
Agree, the RCA 12ax7 BP are very nice. Also Sylvania 12at7 BP are nice too. Westinghouse 12at7 also good. Plenty old tubes that test good are out there.
I suggest you listen to it for a few months and get it broken in before making changes. You might even like it.