You have a working amp. You're asking for help diagnosing a problem that doesn't exist on a forum where the members are openly hostile. What is the problem you're trying to solve, and do you think you're really the person to solve it?
I find it extremely unlikely that naaman would have built a blue hawaii PS board at 350v if it needed to be 400v. So either 1) he didn't build it, 2) someone screwed it up after he had it, or 3) you're not doing something right now.
A work in progress. Making the zipper pull for the red oxx bag gave me a watch strap idea. Now I just need to find the right buckle, then make it again with a buckle
A 5 foot headphone cable would be obnoxious. So you'll have to plug in a 4pin to 4pin xlr cable, probably made with something other than magical cardas wire.