How to repair Vintage Fender tube guitar amp Bassman eliminate noise Add Master volume

Shipped to D-lab in need of noise repair. Of course, one thing led to another. Many hours later, it came back to life, maybe better than the day it was made. Sounds super. Great project. I have decided that my 2020 vision is go back to amp repair and boutique building. Yes, may be less income, however much more relaxing work and quicker turn around. More great things to come from D-Lab electronics.