Did the usual and replaced all the caps in the sound section. Went as far as replacing and socketing a few of the amps, dac, and ha13001. Still getting the same results. Anyone have any ideas what this might be caused by? It seems to be a thermal issue, because if I let it sit for a bit, it'll start up fine, but within 10-15 seconds it'll start crackling again.

Playing it on a mono cab, so it does sound already a little strange, but you can hear what I'm talking about in this video.

https://drive.google.com/file/d/0B23...w?usp=drivesdk

Here's the board