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THE MODERN HEARING AID
THE NEW USER
METHOD OF WEAR
30 other sections not shown
air conduction amplifier audio audiometer battery compartment battery cord battery voltage binaural binaural hearing bone conduction canal capacitor carbon tetrachloride cause chapter chassis chemical clean clothing rub components connections coupling capacitor decibels decrease defective depolarization distortion electronic excessive factors feedback filament frequency grid grid leak hearing aid tubes hearing aid user hearing loss humidity Inasmuch indicate instances intermittent leakage load resistor loud manufacturers megohms method of wear microphone milliamperes modern hearing aids molded earpiece noise ohmmeter otologist peak clipping Pentode Output Pentode plaster of paris plastic plate polishing radio reason receiver cord reduced removed repairs replacement resistance screen screen grid short shown in Fig signal tracing soldering sound output stock earpiece switch terminals tonal tone control transistor hearing aid trouble tube sockets type hearing aids typical unit usage usually utilized vacuum tube voltmeter volume control volume level watt wearer wires