This amp uses some of the pins. With a 1300:8 transformer it drive a small speaker to easy chair volume. The face plate and base board are masonite (pressboard - hardboard) that I laminated with heavy duty aluminum foil.
This is the schematic. I just numbered the tie points and connected the dots with the components. The circuit works well with an earbud. Adding the transformer and speaker works too.
The pin shown hear would be crimped in the middle and inserted thru the board allowing a connection on either side.