Phenix Radio Ultradyne Kit -1924A.jpg New York Coil Company -1922AThumbnailsProudfoot Condensers -1925ANew York Coil Company -1922AThumbnailsProudfoot Condensers -1925ANew York Coil Company -1922AThumbnailsProudfoot Condensers -1925ANew York Coil Company -1922AThumbnailsProudfoot Condensers -1925ANew York Coil Company -1922AThumbnailsProudfoot Condensers -1925A

Another step ahead, with modulation added to superheterodyne radio design. The "Modulation System" seems to be in addition to regeneration added into the RF or IF stages, for increased sensitivity and selectivity. Photo of the radio set sits on a line drawing of somebody's dining room table, where it is unlikely to stay for long. Published in the October, 1924 issue of RADIO ENGINEERING.



Source: Magazine collector Steve Davis

Restoration by: magscanner