This is a guide to building a F4 using my boards, but you may be able to find some useful information here even if you use other boards.
The boards are based on the schematics from Nelson Pass's FirstWatt F4. You can get the service/user manual here: First Watt: Products: F4
You might want to check out the GB thread here: https://www.diyaudio.com/forums/group...gb-f4-pcb.html
Here is a picture of the pcb.
There is a trace error around R22. I have cut the traces on most of the boards I have sent - and the rest of the batch will be cut before I send them out.
These are the cuts which needs to be made:
And the green lines indicate where a connection must be made:
This can be done simply by having the leg of R22 go through the hole and to the side.