The S-40 Hallicrafters line began in 1946 and lasted until 1954. With eight tubes, Model S-40 was the mid-level Hallicrafters receiver of the late 1940s and early 1950s. The S-40B was made from 1950-1954 and sold for $129.95. The large left dial is the main tuner and the small center dial is the bandspread, which allows very fine tuning. The controls in the bottom row are: Sensitivity, adjusts the radio's sensitivity, Band selector, to switch among the four bands, Volume, adjusts audio gain, AVC/OFF, switches automatic volume control. The controls in the bottom row are: Sensitivity, adjusts the radio's sensitivity, Band selector, to switch among the four bands, Volume, adjusts audio gain, AVC/OFF, switches automatic volume control, which automatically regulates the audio level for radio signals of different strengths. CW/AM, switches to CW for code listening, AM for broadcast and shortwave, Noise limiter, switches the automatic noise limiter circuit, which reduces noise from electrical interference, AC OFF/Tone, turns on the power and chooses one of three tone settings (high, medium, low) and Pitch control, adjusts the pitch for CW signals for code listening and STANDBY/RECEIVE, switches between receive mode and standby mode, for use with a ham transmitter. In standby mode, the DC voltage is turned off, but the tube heaters remain at operating temperature, so you can instantly resume listening. It measures 18 1/2" x 9 7/8" W x 8 1/2", 26lbs. The item has been tested and is in functioning working condition