Hi Pat. Welcome to the radio forum. There were three radios available for the 1942 passenger car. Bottom of the line was Model 985792 a 5 tube single unit. Next in line was the Model 985793 a single unit 6 tube radio. With a color change, this radio hung around till 1948. Lastly, was a 9 tube Model 985794 BC/4SW band radio. This unit was an improvement

to the 1941 5-band radio. The 1942 radio incorporated a steering column control which turned the radio on/off, controlled the volume and provided a remote means of scrolling through 5 preset stations. Altho not a 'car' radio, a Model 985866 portable AC/DC 5 tube radio was marketed through Chevrolet. This radio carried a GM logo.
In the case of a radio that 'powers up' and doesn't play, the problem is usually in the power supply. Number one cause is the vibrator and next is the OZ4 rectifier tube. I do not recommend the owner attempt to replace either of these units. After all, what caused the unit to fail? That situation probably still exists and will only cause the replaced units to also fail in short order. Any radio that has not been serviced for several years should be removed and repaired/restored. This includes solid state components in the power supply and replacement of all paper condensers, proper alinement, and mechanical servicing.
Pat, to keep this from becoming a commercial (sales pitch) I will contact you directly on the last portion of your post.

[ January 01, 2002: Message edited by: chev33radio ]