The Hearing Aid Museum

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Vacuum Tube Hearing Aids: 1921-1953


	National Hearing Aid Laboratories, Model ST "Star" Mod I Vacuum Tube Hearing Aid (1947) (B1464)

	National Hearing Aid Laboratories, Model 509MM Mod II 1st Series Vacuum Tube Hearing Aid (1950) (B1161)

	National Hearing Aid Laboratories, Model 509MM Mod II 2nd Series Vacuum Tube Hearing Aid (1952) (B1165)

Click on the "General Information" button (top button left) for an overview and general information on this category of hearing aid.

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