I connected 2 sets of 8 ohm speakers to my Sansui AU-11000 and it sounded very good,a few days later I was listening to it when I turned it off and back on about 20 minutes later but it wouldnt come out of protection so I took the speaker wires out pair by pair to see if it was the speakers and the very last pair of wires I took out had it come out of protection? I put the A speakers into where the B speakers had been and everything was OK. So the next day I thought Id better check the DC offset and bias settings.The DC offset was pretty close at around -20 milivolts. The bias was way out until I realized I had connected the DMM up wrong! So when I had just got it all done, I was withdrawing the screwdriver out and I touched something on the driver board with it and got a loud spark and bang. I checked the output transistors,they were OK but when I checked the transistors on the driver board 6 of them on each channel had their collector at a higher voltage than the emitter? I thought they were all blown at first but when I took them out of circuit and measured them,they were all OK? Ive checked everything on the board but cant find anything wrong? Its not connected to anything either. If anyone has any ideas or suggestions Im all ears.This has got me stumped? The red crosses mark the transistors with the strange readings,the others read normally.