Originally Posted by PRR
Much better schematic at DIY Audio Projects Forum
Did you get as far as measuring for +14.8V at the point indicated?
It is possible
the 4.48V-5.6V bias trim is not wide enough for "all" things sold as IRF*10. If you post the voltages you observe, we may suggest alternate bias resistors to dial it in.
I am sure I did, it seems so long ago I can't remember details. I do have to replace a zener diode as I thought maybe I put power cap in wrong way so changed it and instantly one of them blew. So i had put cap the correct way in the first place.
If i get the chance I will get it going the weekend to check what values I get.