The S-36A covers the "Ultra High Frequencies" according to the front panel logo (27.8 to 143 Mhz) in AM or FM. It and its predecessors, the S-36 and S-27, were used during the World War II era and later to monitor the frequency spectrum now called VHF. The British also used this series of receivers to monitor some of the German radars. The front end uses three acorn tubes, the 954, 955, and 956. The schematics are listed in Riders. As can be seen, this model has the schematic factory mounted inside the top cover. The bandspread escutcheon, essentially a square meter face, is missing on this example. Priced at $415 in December 1945 Allied Radio ad in Radio News.