All sorted on the P100G.  The obvious problem was a disconnected wire between the two main PCBs, which I think may have been caused by someone trying to fix it before.  However, the main issue was traced to a coupling capacitor on the PCB with a sheared leg in the return path from the reverb unit.  By the way, I only took one photograph of the the top of the main PCB, since I didn't need to fully strip it down, and therefore couldn't get a good shot of the rest....

I've managed to get a full schematic for the Stinger too.....

So, a nice little combo fixed.  And a Laney VC30 sorted too.  Happy    Thanks to you all for the offers of help - very much appreciated.

That's great - thanks    I'll take some shots of the boards in the next couple of days and post them up.

I've just had a quick look at the Peterson combo which has lost its reverb - nothing obvious, and I should be able to trace the audio path through in the absence of any paperwork.  It would just make life a little easier if I had circuit diagram though....

I have actually managed to get some technical literature for the Stinger from Proel now, so at least that's a start.

Thanks very much for the reply.  The reverb is not working in the Peterson combo - I need to see if it's anything obvious, but as you say, someone on here may know of a common fault.  The fault on the Stinger head is a different story....  It has had a major failure in the PA output stage, resulting in burnt components and possibly a damaged PCB.  If I can establish the values of some of the burnt resistors, I may be OK, but a schematic would make life a lot easier for this baby.

Note to self: do not be lazy and use a Mesa Boogie 4 x 12 to check faulty amps (rather than getting the usual test speaker). The faulty Stinger head had the power supply potential present at the output jack, which popped the speakers in no time flat.... :duh

I'm new to this forum, so hi to everybody    I repair the odd amp (sometimes very odd) and no doubt I can find lots of useful information here...

I currently have a Peterson P100G combo and a Stinger STP200H head to sort out.  Chalk and cheese for sure...  I need schematics/layouts for them - can anyone point me in the right direction, or e-mail me if they have one or t'other?

Thanks,

Mark