Need help picking my first tube amp

Hey guys i want to get into tubes, i have heard wayyyyyyy to much and am dying to try a tube amp.  I have a budget of 650 us dollars, not sure if i want a pre amp, or full tube amp.   Im thinking pre amp cause i would really like it to drive headphones and then run it into a amp and then to speakers.

Been reading alot about Chineese tube amps and not sure what to think.  I have my eye on Xduoo TA-26 gets rave reviews has anybody used it ?  anyways looking for any input i can get, thanks.

Michael