I'm an idiot an dsoldered the TO220 packages for VR1 & VR2 in my SOHA backwards. They got hot real fast, and I instantly saw what I did. The +12 supply for the opamp portion was reading 13.5v when I tested it, and clearly something was wrong because that was supposed to be the output from the regulator (7812). So I flipped them around, and the voltages were still whack. 0v if the opamp was in place, 13.5 if it wasn't there. The negative rail (7912) was reading -9volts. oops.
There was still output though, and 1.5v of DC offset, LOL.
I ordered two more regulators, and they should arrive tomorrow.
I also ordered all the parts that AMB stocks for my MMM, but that was the end of my headphone budget. It'll be a while before I order te rest of it.
Also, a question for Nate: as you saw in the toehr thread, I plan on using some OPA637's I have for L & R. Think it will make a big difference if I use say a OPA132 (I think thats the single part number) or another cheaper opamp for the ground channel instead of a 627? I'd think there would be a tiny difference, but nothing major (or warranting another $20 that I'd rather put into a better PSU).