This article is from the Antique Radios And Phonographs FAQ, by Hank van Cleef vancleef@netcom with numerous contributions by others.
Your phono pickup probably uses a Rochelle salt crystal cartridge,
and the salt crystal has failed. You will need a new cartridge. (faq
editor note---I'm including this, and have a radio-phono with a dead
cartridge. What's available?).
 
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