With that budget in mind, you might want to consider used gear.
For example, I just got this email from Cary Audio today, although I am pretty sure it doesn't have a headphone jack. You might take a look on ebay and see what all is up for sale.
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