Any amp geeks out there? I've got an old Baby Blue head which blows the line fuse a couple of seconds after power is applied. The output transistors get hot as well-looks like some component is telling them to draw a ton of current for no good reason. Doesn't matter if inputs or speakers are plugged into amp or not. No sound to speakers when this happens. I installed new output transistors assuming one or all were faulty-problem remains. For the heck of it I installed a new pre tube, no difference. I can't find a good schematic anywhere, a lot was lost when Fender took over SWR. I am a reasonably able tech but am out of my depth here-any ideas would be greatly appreciated, Dave.