I have a Super Scout Amplifier. It has (4) What looks like 6jg6 tubes and (8) larger 6MJ6 tubes. The tubes are hard to read because they are old. I think the power supply needs to be replaced. It's a neat looking amp and I'd like to repair it. I'm not sure where to begin. I have done some reading but I am lost. I think I could manage replacing the power supply but I am confused about the tubes. Any suggestions?