I have a 638 console that uses the same chassis with the selenium rectifiers. It also has all those open holes were the tube rectifiers were in the previous version. I also have the 14" 698 model that stromberg6 mentions. It's been a 4 or 5 year work in progress but I'm very close to firing it up. I've nicknamed that chassis the spaghetti monster. It's just a wiring nightmare.
