National Vintage Model B 1X12 Combo Tube Amp 2-6L6 Tubes 1930's

National Vintage Model B 1X12 Combo Tube Amp 2-6L6 Tubes 1930's .I bought one of these 30 years ago that had a changed speaker to a P12Q and have had many baffled at how Amazing and Powerful it sounds.Robert Johnson could have plugged into one of these and made History ( More ).I can't find anyone local to work on this and clone my other one so I'm moving it down the road.The other has never gone down in 30 years so I should be Good for 30 more.It had no tubes when I bought and I didn't put any in since it was a project.