DH’s book is the best I found for understanding tube amps without prior electronics experience Weber’s books are all helpful as they offer
practical solutions to tube amp design, building and repair. Aspen Pittman’s book is also good, as are others. I would suggest that you consider the 2Stroke as a first step, there are several here on the TAN site that will help you along the way with it if you have questions or run into trouble. You could build a kit or two first to build confidence but really, with DH’s circuit walk-through in the book, you will learn more by sourcing the parts and building the 2Stroke (IMO).