DIY 300b SET monoblock

Hello,

My father is an experienced amatuer radio operator who has a large, self restored radio collection of both solid state and tube. In addition he is an electrical engineer of 40+years.

He has offered to build me a tube amp and preamp if I can do most of the research for parts and schematics.

I am wondering if anyone has an experience in this and can suggest a very good set of plans that sound great. I believe that the plans can either be a simple design that a beginer could handle or something for someone who has ALOT of experience, depending on which final product is better. Preferably, 300b would be good, but other tube types are acceptable.

The same goes for a preamp.

Thanks_