The M2 Output Stage in Class A/B, and maybe a Power WHAMMY?

With that high a voltage you could run a CapMx PSU (maybe the SLB - it will loose 3v per rail) and then power an F5 turbo. If you can get suitable / matched output transistors then that might be a good use of your transformers.

This amp is limited by the max voltage that the front end OpAmp will see (likely not continuous rating, but the switch on transient). For an OPA604 you're looking at +/-23v max
 
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