NO. 4660 (Model 9C)

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of John Jenkins | Visit the SparkMuseum!

Wonderful working example of AK 9C - Image Courtesy of Jeffrey Rehkopf

The Atwater Kent No. 4660 Model 9C, also known as the "Compact 9," was introduced in 1924. A key technological advancement in the Model 9C was the replacement of the variometers with more stable and efficient variable condensers. The Model 9C typically employed a four-tube circuit, utilizing one UX-201A tube for the radio frequency amplifier, a UX-200 tube as the detector, and two UX-201A tubes for the two stages of audio frequency amplification, a common configuration for high-quality receivers of the era. More closely resembling the No. 4700 Model 10C, the No. 4660 had one fewer radio frequency amplifier stages. Board dimensions are 20-1/2" x 10".