There are certain things that the only way of fixing them is to find another parts radio, like the mechanical tuning parts, or a bad Transformer. Some of the volume/tone controls are available. All of the resistors, capacitors, tubes, chassis wires, bulbs, sockets, vibrators, speakers are available or can/should be replaced with NOS or modern parts. Of course you have seen the plastic reproduction parts that all the vendors offer for the AD radios. Good place to start looking for parts is
www.radiodaze.com Take loooots of pictures.
Denny Graham
Sandwich, IL
ps. If ya have a label on the side of your case, I sure would appreciate it if you could snap a high res close up picture of it for me with your digi camera. That goes for any one else who is skinny enough to crawl under the dash.