A working illustration of the amazing Philco “Beam of Light” phonograph pick up, being demonstrated on a 1941 Philco model 41-616 Radio/Phonograph Console. The record changer which is a Webster Chicago Deluxe Changer is set to operate in the Manual mode to minimize the risk of damage to the record. The BOL system used a beam of light, a mirror, and a photo cell to transform the needle movement in the record groove to electrical impulses for amplification. The permanent jewel stylus rides in the groove at a meager 1.25 oz. of weight, which was a very light tracking force back in 1941.
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