[Phlogiston]

The wires leading to all transformers, including the power transformer, and all coils can be changed. There is a land for all connections, usually buried under the tar. It takes a little practice with a hot iron to find the land but a new wire can be soldered on and the tar acts like flux.

Seventh picture down:

https://www.russoldradios.com/blog/atwater-kent-559n

Sixth, 7th and 8th picturs down from the top:

https://www.russoldradios.com/blog/who-l...-a-chassis

This only works on AKs.