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I think by that time, a product commonly known as "masonite" was used. It is a sheet of medium density fiberboard with holes punched in it. Some manufacturers claimed better sound by using a back cover. I have a 1938 RCA U128 that has screw holes for back cover as well.
By the way, that is a nice RCA Victor. What features on record changer is in it?
At that pre-war time Philco was advertising the beam of light pickup instead of the replaceable needle..
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"When resistors increase in value, they're worthless"
-Dave G
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