Hi everyone! I'm experiencing a strange problem with my Marshall 9200 power amp - the volume seems to be very low on both channels - I need to turn it up to about 3/4 of the way to get acceptable band practice levels, where as using the power amp of my peavey ultra 60 head I get incredibly loud at about 9 o'clock of the master volume dial (same preamp settings). I have recently retubed the right side of the amp with 6L6WXT+'s but it didn't change much except for some tone improvement compared to the older (probably stock) 5881 tubes. Do you have any suggestions what the problem might be? Blown components? Bad driver tubes?