Ok, here it is. 100W per ch (before clipping). I owe something to this forum.

Hope there is some more HH love out there.

Hi
I'm usually a lurker, but have been getting deep into SS amps for awhile now. I have HH's and a Trace Elliot, and an old Heathkit TA16 I rebuilt. Love them all. My HH MOSFET Studio 60 'Power Baby' is my go to amp.

But I found something peculiar....I've attached the schematic and before I state what the amp model is...I need to know what this is a derivative of. It appears to modulate the rails...
I have checked, double checked, and compared both ch's (it's a 2 ch amp). It's a single sided pcb, very spartan and spread out (altho the layout and routing are worse than amateur).
It is a guitar amp. Has anyone seen anything like this? How does it work. It does work, I had it running and it's 100W into 4ohms!

Once I have complete schematic done (incl power supply), I'll be happy to contribute it to schematic section...and reveal make/model (it's well out of production).
Thanks
all.