Do you plan to run speakers with it, too? It's an integrated, with 5W and 8 ohm taps. So it probably has output transformers for that. My guess is that it has a resistor or two to step down the output for headphones.
I'm wondering if they put the output transformers next to the power/filament transformer under the box at the rear. If they did, that's not the best design. It can be done, but the output transformers should be as far away as possible from the power transformers. Get them too close together and you're going to get noise. I don't know what's under the hood here, though.
I'm not sure why they put the 6E2 in there. It's a variant of a "magic eye" display tube. I think it displays bars, probably along with the output. If you like that sort of thing, great. I don't like putting gimmicks or anything unnecessary on amps, but that's just me.
The 12AX7 is a common tube, usually used in guitar amps. I don't like them much for audio applications, though some do. They are inexpensive and widely available. I'm not familiar with the 6P14; I think it's a Russian variant of the EL84. The EL84 is another tube widely used in both audio and guitar amps. I haven't heard an EL84, but there are some nice looking DIY projects that use them.
For construction, it looks like the tube sockets are mounted on a PCB under the chassis. Personally, I'm not crazy about PCBs with tubes. Tubes give off more heat than solid state does (generally) and PCBs don't always hold up to heat very well. That depends on the PCB quality and I don't know what they're using.
It could be a good amp. Thing is, do you want to risk $400 on something that might not be?