I have taken some EE classes in college, and have played guitar, soldered wiring harnesses, etc. but never anything to the extent of a valve amp, but I'm interested in challenging myself.

However, I can't seem to find any websites dedicated to valve amp circuit design and really going through the basics, planning, the design of the circuit, the math involved, contruction, etc.

Everthing I see eventually reverts to getting a kit, or finding a schematic. I'd like to create a schematic and build this. Anyone have any good links for me? TIA