A 75-year-old radio needs ALL the capacitors replaced, rust and corrosion dealt with, and all-too-frequently they need special parts such as IF transformers which are not available new.The typical service cost is several hundred dollars for parts and labor -- and can take months if certain parts need to be sourced (and they will also be old parts! Despite these obstacles we still enjoy bringing an old set back to life.
So we have stopped offering original service, in favor of keeping a high standard for conversions.
Of course we have nothing at all against original radios -- in fact we listen to home sets in the shop every day (and have more to restore, if we ever get the time! But we feel we're doing a greater service to the public by offering the best product there is, for up-to-date listening in your older driver.
If your car is 100% totally original and wish to keep it that way, that's great -- there are several other dealers who perform quality work on these radios, that can certainly take care of you.
Thoughts on original repair: We began the car radio business by offering repair/rebuild service for original radios.
After all, a 100% restored vehicle should have an original working radio, right? It seems more and more cars are being used as drivers; restorations are fading in favor of "resto-mods", meaning the car looks the same, but contains updated hardware such as 12 volt battery, electronic ignition, disk brakes, and air conditioning.
If the car is a driver, why not improve it by updating for safety and convenience? Most radios made before 1970 will only receive AM, and a quick surf across the the dial will bring the reality that the only material left on AM is news and sports; very little else.
Older AM radios are indeed collectible -- you'd be amazed at the number of people who collect and rebuild vintage home radios, especially those built before WWII.
You'll also find that these same people, in order to enjoy them, either modify them to play another device, or build small transmitters to allow them to receive music from a computer.
Though still in use, AM radio for the most part has become obsolete.
The receivers themselves have also become more difficult to restore.
A 5-year-old radio may need a vibrator, a new capacitor, and possibly a weak tube replaced.