hi all, Quick question before I take this to a tech, I believe it's a cold solder but we'll see. Anyway the head when connected to a cab will basically make no noise at all, even after a good warm up so I have to crank it and then thump the E string to get any volume (only quiet) and then play to keep the volume rising or the amp warming up until it's fine. Problem again is I can knock the amp and it'll basically go back to nothing. Now and again the volume will drop or disappear if I don't play. Is it cold solder?? What do you think. Cheers, Matt.