I have found little information on Airline brand radios, but one thing I know is they are the Montgomery Ward brand and they bought chassis from OEMs and had cabinets made for them. Because of that, if I need a schematic I usually have to dig through a Riders collection or Sam's photofacts to find chassis that look similar and have the right tube complement. One of my Airline radios had an RCA chassis, so when I found it, I made a copy of the schematic and placed it inside the radio cabinet for future reference.

The truth is they rarely need service though. The tubes will go ouyt after a while, just like light bulbs. But they do tend to last a long time. The original capacitors go bad after sitting dormant for a few decades, so usually the caps need replacement but not always. But as long as the capacitors are good, these old radios tend to last a lifetime.

I love these old tube radios. It's fascinating, knowing someone listened to history through them.

• My tube radio page