10 amps to drive steppers

I bought an old CNC mill and need to retrofit it. It has some ancient 3
phase electronics, huge inductors, and so on to drive the steppers. That
will all be replaced with modern electronics- the question is what
electronics.

Can bigger transistors be put in the Camtronics stepper drivers to handle
more current?

Are there other sources for high current / low priced chopper drives?

Many thanks for all suggestions.

Elliot Burke