Collins 75S-1 S-Line Receiver

Collins "S" Line 75S-1 Receiver had sharp selectivity and exceptional sensitivity because of its advanced circuitry.  The Collins mechanical Filter achieved selectivity unsurpassed in radio technology,  Tuning range was from 3.4Mhz to 29.7Mhz in 200Khz ranges, and came with a built-in AC power supply and weighted 20 lbs.  

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Notice in this chassis view picture of the 75S-1 Receiver the blank plate in the center of the chassis, this is where the accessory noise blanker would be installed.