The old capacitors used back in the day tend to pop like popcorn after they get old. The chassis is relatively easy to work on though. I'm good enough at soldering that I wouldn't be afraid to do something like that but I still work a day job. Clean it out real well. Test the vacuum tubes & replace as necessary, replace all the old capacitors, and test the ********. Sometimes the old vibrators just need the points cleaned but it's not an easy job. There is not a lot more that can go wrong with them unless some resistors burn out but you can usually detect it visually when they burn up. Get a new speaker and it will work like a charm. The only problem is the lack of AM radio stations worth listening to.