• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

First DIY Tube Kit Recommendations

The cool thing about that little Elekit that I mentioned is that there is a jumper on the PCB that you can use to switch between Triode, pentode and I believe Ultra Linear. Kind of fun to play with. There is also a thread where a guy made a list of relatively inexpensive upgrades that you can do to it. Lastly, there is a forum member here (vkung) who sells Elekit stuff as well as another brand or two of tube amp kits. He is reputable and provides good support for the items he sells.

Hopefully this helps. 🙂 Should be a easy way to go about it as there is a lot of info support etc for it.
 
Save another $300 and get something better. It will be worth the wait.
Like say a restored Dynaco ST-70, or ST-35.

The Dynaco speakers sound at their best with good solid state amplifiers.
And I say this owning many tube amps and 4 pr of Dynaco speakers.

I recommend and use a good 30W - 50W per channel ss amplifier for the Dynacos.
Instead I use tube amps on my Quads and LS3/5As, which do need tubes to sound best.
 
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Then a ST-70 should work if he is wanting tubes. A new kit would be over his budget though. Some of the problems with the Chinese kits are due to using 110v primary transformers, so the B+ and heater voltages will be too high for 120v use. You can add dropping resistors, but you shouldn't have to modify a new complete kit. They like to "clone" known circuit designs, but tend to leave out some components. I guess to save money, but this can cause stability problems, etc. I've seen some really poorly done designs. Not all are sketchy, but you really need to do some research first. I bought an EAR clone that wasn't too expensive, but knowing I would have to drop the secondary voltages along with a few capacitor swaps. It turned out nice, but I wouldn't use it as is out of the box.
It would have cooked the tube rectifier and other tube heaters.