The VTA ST-120 from Tubes4HiFi is a good bet. I'm not aware of any others.
http://tubes4hifi.com/amps.htm
http://tubes4hifi.com/amps.htm
Dynakit MkIII from dynakitparts.com Well proven amp with good reliability.
Most any "normal" Tube amp will be "warm and rich" compared to the average SS amplifier, so your possibilities widen.
You might be interested in my Modular amp design...
https://www.diyaudio.com/community/threads/modular-amplifier-1.375206/
https://www.diyaudio.com/community/threads/modular-amplifier-1.375206/
That's a nice kit, but they haven't had them in stock for ages and ages.
There's Pete Millett's "Engineer's amp" but he only provides the board, you have to come up with the rest.
http://www.pmillett.com/DCPP_MB.html
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There are any number of 50-60 wpc tube amps you could build. How much experience do you have? Are you able to drill a chassis, etc.? Like I said, there are very few ready-made kits out there that offer that much power.