Recommendations for a small tube amplifier?

I have a modest office system for near-field listening that I spend a lot of time with and have been gradually evolving over the last couple of years.

I'd like your advice about a tube power amp to use with a pair of JohnBlue JB3 single-driver speakers and a NuForce Icon used as a DAC and preamp.

Preferences would be for a small footprint and the use of fairly common output tubes. I have a box full of EL34's, KT88's and 6L6 tubes I could use but would be open to other easily found tubes like EL84's.

I don't need a lot of power, the 12 watt Icon has plenty of power for the JB3's. Bass isn't a major consideration since I have the NuForce W1 subwoofer in the system.

I'd be open to building an amp from a kit, my first piece of audio gear was a Dynaco SCA-35 I built when I was 19.

One option I've looked at is the Sophia Baby but I'd like other ideas, as well. I'd like to spend $400 or less if possible.

Thanks for your help.