I started collecting vintage radios at one time. Mainly because I think they are cool and they usually go for pretty cheap. I got this one for free from a family member. It was in pretty bad shape. I had plans to restore it back to original but then I realized that it only tunes in AM station and would be of little use. But I love the way it looks with the tubes, soft lighting, big dial, and wood cabinet.
So! I decided to make it play music of its era. But, I wanted it to tune in a radio station (mp3) using the dial and keep the original parts.
The Raspberry Pi is playing two MP3s at the same time to create the "tuning" effect. The tone knob now selects between 1930, 1940s, 1930s Christmas, and War of the Worlds radio broadcast by Orson Welles.
The video has more detail on exactly how it works. I think you will enjoy the video. Please let me know of any questions or comments. These old radios are a work of art! This one will have many more years of life in it as long as that Raspberry Pi keeps going.