Hello all, I am seeking some guidance on the problem in my Ibanez ToneBlaster 100H.  When I turned it on, the volume was basically nonexistent.  I had to dime it just to get a tiny amount of volume.  The distortion still works from what I can hear, so that tells me the problem is in the poweramp section.

There are 2 sources which are suspect to the disorder:

A couple children were flipping the power switch on and off repeatedly while the power was on,

and I hooked up a Boss MegaDistortion which seemed to be acting a little wierd.

Can anyone please give me some guidance?  I can post pictures of the inside of the amp if that will help at all.  Thank you!

Hello all!  I have a Crate G40-C that has some issues.  Here is the schemo:





Sorry about the bad pics, but they are the only ones I could find, and they are pretty fuzzy, it is hard to make out component values.  

This is a 2 speaker amp.  The problem is, when I hook up the working leads, everything is fine for that speaker.  When I hook up the second set with the working set, it makes a high pitched screech that gets exponentially louder the longer it is left on.  When I hook up the bad side by itself, there is nothing, not even static or hum.  The advice I have so far is resolder all the joints, due to the infamous wave-soldering Crate use at the time of this amp.

My questions:  does anyone know what this problem is?  If not, my second question is can I safely bridge the 2 outputs to get the full power of the amp, and how do I do this?  Thank you for any help.

EDIT: Oh yeah, I forgot to mention that the speaker load is 4 ohms.