Suggestions for a clipping detector for my JLH1969

I would like to fit a simple clipping detector to my power amp.

Each channel has a seperate DC power supply, which is single rail.

I'm looking for a decent, low parts count circuit that i can retrofit easily.

The internet is full of examples, but each circuit I have come across has people saying it is ok, and others saying it doesnt do the job properly ...

A secondary aim is to figure out whether I picked the wrong transformer when I originally built the amp. I know I am on the lower end of what the boards can handle.