Ok. So i put the amp on a board, went over all joints and connections and all seemed fine and it made the music. Happy moment!
I then moved the amp to a new case, connected everything and started listening. It held up fine and sounded great at low levels for maybe two hours. At that point I turned it up a bit, maybe halfway on the pre, and it started to distort badly, then flail back and forth between distorted and quiet music and after maybe ten seconds of this going silent. No more music... The chip was cool to the touch. One of the resistors (big one) was a little warm but nothing bad. I measure 22.4 vdc in to the amp, zero volts at speaker output. No speaker posts or connectors touch the chassi.
I'm starting to give up on this DIY thing at this point... :´(
So I almost gave up and did other stuff for a while, after being quite discouraged by the struggles of amp building. I still have the big EC7293 waiting for me as well...
I´m posting a few pics. My suspicion is that I might have fried a transistor or so, but I´m not sure how to measure for it. My biggest scare is that I somehow damaged the chip, which would really, really suck. I'm hoping for you guys experience and patience to help med put this together.