The man that fixes my old tube radios says his supplier of tubes and other parts to tune up / replace has gone out of business can anyone help me with another source. Thank you very much

You mean he had only one supplier? Have him look at any good search engine
along with you, using the right keywords. I trust you will find more good parts
than you will ever need.

If you have any specific need, just get back with more info. Good luck.