No. 4325 (Model 8)

The Atwater Kent No. 4325 Model 8 Duplex Receiving Set is one of the most mysterious and prized pieces in the company’s history due to its near non-existent production. Manufactured briefly in September 1923, this five-tube breadboard was designated as the Type 4325, and historical records indicate that only 17 units were ever manufactured (though the intent was for limited production, not commercial retail). It featured a five-tube circuit, typically using five Type 01A tubes (or a 00A detector), consisting of two RF amplification stages, one detector, and two AF amplification stages. Board dimensions are 23" x 10".

Model 8 Type 4325 part of | Phil's Collection

The Model 8 / Type 4325 was briefly advertised in a 1923 brochure.

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie