Whilst mulling things over in my head, I had a mini brainwave. Last year I had a Rodgers electronic piano, actually a Roland one with about 4000kg of additional weight…
Anyway, it was not fully functional so it was stripped for parts.
One I had forgotten about was the PSU + AMP… Ooooohhhhh…
This has, I believe +12, -12 and +5 power. Along with a stk4192 stereo amp. Built like the proverbial brick s##t house.
I dug out a service guide for the Roland, unfortunately the diagram is useless… So I will have to trace and probe.
But this should make a great Psu/amp for the modular.