I built this stereo amp kit a few months ago. Uses single ended 300B tubes with class A bias. Very high quality kit and manual, though I expected that from Japan. Fed directly with a CD player.

https://www.elekit.co.jp/en/product/TU-8600R

Also built some single driver, folded horn speaker kits. These pair will with the tube amp.

https://www.madisoundspeakerstore.com/full-range-speaker-kit...

I pretty much only listen to string quartets with this setup, and it sounds great.