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I dont think professional repairmen would lose the back... besides they would not want the liability of someones kid or cat getting electrocuted. A lot of people back then would take the tubes out, and run down to the drugstore to use the self service tube checker when their set went out. then either they would decide the set wasn't worth the investment if expensive tubes were bad.. or they would buy a tube and that still didn't fix the problem...and chuck the set in the attic or basement..and the back never got put back on and eventually got lost.
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