[patmat2350]

I am looking forward to learning more about Phrank's guts, and cleaning and upgrading (the caps especially).

I'm a mechanical engineer with a vague understanding of electronics. In my high school electronics shop course in 1974 (yes that was a thing), I even built a simple tube radio- hand-bent the chassis box, soldered all the bits, etc. I wish I still had that radio, but especially the textbook from that class! It explained all the tubes and stages at a high school level, perfect for me.

The 655 schematic here shows a phono jack (or switch? It's an unknown symbol to me), a pick-up, and a phono-motor... none of which are present on mine. There is an unused knockout on the back of the chassis (circled below), maybe the right size for a jack...