Hearing aid technology took a great step forward with the introduction of the body-wearable Acousticon and similar carbon-type electrical aids. Substantial amplification was now available, although don’t think about Hi-Fi. These instruments used a carbon microphone or microphones connected in series with a battery, a magnetic earphone and a variable resistance. The resistance was used…
Category: Antique Hearing Aids
This Section includes Information about Antique Hearing Aids such as copies of User Manuals for Acousticon carbon-type electric hearing aids from about 1926 and articles from Radio-Craft magazine of Oct 1938 about Hi-Fi hearing aids and hearing aid testing methods.
New High-Fidelity Hearing-Aids
Familiar audio amplifier design, and the use of Rochelle-salt-crystal mikes and ear-units, combine to produce a good sideline item for servicemen. Radio technique at long last has come to the aid of the hard-of-hearing. The audio amplifiers that constitute such an essential element in radio reception have been refined to meet the particular needs of…