I am a big DIY fan and I'm looking to learn a little more about transistor amp history. Mainly the evolution of amp designs. I have built a few tube and transistor circuits and I have noticed that tube amp history is well documented but, solid state history is almost nonexistent. Most of the tube amp circuits we see today are based on a few designs out of old RCA field guides and such. This has me wondering where did the original transistor amp designs come from? Is there a classic transistor application guide? I have seen excerpts from some but, I'm not sure if any particular one is worth searching out. Old school GKs, Sunns, Kustoms, ACC, etc had to come from somewhere but, they don't appear to have many similarities. Anyone have any insight?