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Author: admin, 05.08.2015
Early Electrical Hearing Aids were based on telephone technology invented by Alexander Graham Bell in the late 19th century.
Concealed designs were limited primarily to stationary items resembling tabletop appliances such as radios. This aid, manufactured by the French Electric Co., around 1930, is housed in an interesting camera-style case.
One ingenious example of a carbon hearing aid designed for camouflage was the purse model by Amplivox created around 1935.
The Siemens Halske Company, founded in 1847 to build telegraph lines, was located near Berlin, Germany. The introduction of vacuum tubes in the early 1920s was a major technological step in the evolution of electrical hearing aids.
During the 1930s and 40s, miniaturization of vacuum tubes allowed manufacturers to develop body-worn designs that housed vacuum tubes and microphones within a single unit, which allowed for portability. Zenith introduced its first vacuum tube hearing aids in the early 1940s – the Radionic A2A in 1942 and the A3A in 1944. The Zenith Radionic instruction manual also offered several pages of hearing aid accessories for sale, including these two pages of battery holders. The Zenith Model 75 represents one of the earliest models incorporating the microphone, amplifier, three vacuum tubes and batteries within a single unit. Hearing aids that fit into a shirt pocket or clipped to a lapel were the first all-wearable styles, housing the batteries, small vacuum tubes, amplifier and microphone into the same casing.
Hearing aids that clipped to a tie or a lapel were among the first all-wearable models of hearing aids. The Hal-Hen Men's Hearing Aid Klip was designed to fasten to two buttons on a man’s shirt. Sonotone’s brochure for the Model 940 illustrated a number of decorations that could be used to decorate and disguise the outside of a microphone.
For women, hair is a natural place to conceal a hearing aid and hearing aid manufacturers of the 20th century, like those of the 19th century, designed a variety of models that could be concealed within hair. As shown in these advertisements, hearing aid hats and scarves were available in a variety of clever styles for the fashion-conscious woman. Hearing aid manufacturers also included directions on how to wear your hearing aid while at the beach or wearing a halter neckline.
This wig patent from 1934 represents one of the few designs for non-electrical hearing devices of the 20th century and was used to disguise hearing trumpets. Another unusual patent for hair is this patent from 1957 that allowed for women to wear an ear trumpet device while using a hair dryer at the beauty shop. In the 1950s, many men and women would not dream of leaving the house without being smartly attired with several items of ornamental jewelry. Manufacturers were well aware of how concerned their users were with concealing their hearing aids. The Hal-Hen pearl hearing aid necklace as modeled by the creator’s wife, was designed to camouflage the hearing aid cord.
The development of the transistor in the late 1940s enabled once-cumbersome hearing aids to be streamlined into single units practical for everyday use. One ingenious design of a camouflaged hearing aid that was possible with the development of the transistor was a radio.
The behind-the-ear hearing aid (BTE), first introduced in the late 1950s, was an ideal means of concealing a hearing aid – it was worn discreetly behind the ear and underneath the hair, with a custom-made earmold. Zenith’s first BTE (behind-the-ear) model hearing aid was the Diplomat, introduced in 1956.

In-the-ear (ITE) and in the canal (ITC) hearing aids were introduced in the late 1950s and early 1960s and even smaller completely-in-the-canal (CIC) hearing aids entered the market in the 1980s and 1990s. The ECA-1 (Ear Canal Aid) was Otarion’s first ITC (in-the-canal) hearing aid and was introduced in May 1961. By 1996, hearing devices housing all hearing aid components completely within a custom-made earmold represented about 80% of all United States hearing aid sales.
Along with enhanced, customized performance, digital technology has introduced an additional hearing aid component: a remote-control unit used to select from among pre-programmed sound processing options.
Phonak’s Claro system of hearing aids can be remotely controlled by both the SoundPilot and WatchPilot systems. The Songbird disposable hearing aid model, launched in 2000, was an attempt to bring affordability and convenience to hearing aid users. In the 1990s, manufacturers began to design hearing aids to be noticed as jeweled adornments and works of art. Earmolds are also available in many colors and with whimsical decoration such as polka dots and frogs.
SECURE LONGER LIFE and CONTINUOUS EFFICIENCY for HEARING AIDS. Moisture is the enemy of all hearing aids. Dampness, humidity and body moisture reduce their sensitivity, shorten battery life and cause corrosion.
Dampness, humidity and body moisture reduce their sensitivity, shorten battery life and causes corrosion. Using an external power source, sounds could now be made louder than was possible with earlier mechanical designs. A carbon-granule microphone in combination with a battery could produce sound at an earphone at levels greater than those possible with mechanical devices.
It was large and not easily transportable – the batteries were cumbersome and the carbon components were highly sensitive to heat and cold. The purse contained the battery pack and microphone and the user held the earpiece to her ear while holding the purse so the microphone faced the talker. A medical department was organized in 1877, and in 1910 the company began manufacturing hearing devices.
However these early body-worn hearing aids were cumbersome and still required use of batteries not housed within the hearing aid. The batteries were at least as large as the other components of the hearing aid and weighed up to 2.5 pounds. These photographs, from the instruction manual for the Radionic, provided suggestions for wearing the body aid and batteries. These illustrations come from the manual for the Sonotone model 700 hearing aid, introduced in the mid-1940s. Now, the microphone, amplifier, and batteries could be packaged in one unit with a single cord to the earpiece. The list price of the Model 75 was $75.00, a low price that Zenith advertisements emphasized. These devices were usually directed toward men, who often wore suits, ties, and shirts with pockets which allowed for concealment. The microphone was on top of the device, thus eliminating the unwanted noise from the microphone rubbing against clothing.
Hearing aid barrettes were available in colors to match one's hair and included instructions on styling to conceal the cord and earpiece. This brochure from Paravox outlined the steps to concealing a Paravox Veri-Small hearing aid within a hairstyle.

In this era, hearing aid earpieces were often disguised as earrings, microphones made to resemble brooches or tie clips, and cords concealed within women’s necklaces. Sonotone and others published brochures directed at both men and women, recommending fashion tips and describing in detail how to wear and conceal aids.
What could be more practical than incorporating a hearing aid – or two – into eyeglasses? As seen here in the photo, a hearing aid is disguised as transistor radio, the 1960s equivalent of today's iPod.
The BTE incorporated all components of a hearing aid into a single, streamlined unit including the batteries.
This four-transistor aid has an external receiver and microphone openings on both sides of the flesh-colored plastic case. These models provided more opportunity for concealment with acoustic benefit for many users. New features such as directional microphones, flexible digital programming and adaptive filtering provide users with the best of both worlds – an effective hearing aid that is also virtually unnoticeable. These units, usually designed to be tucked into a pocket, are also available in a working wristwatch model. Pictured are a BTE aid (center, bottom) and the hand-held SoundPilot remote control (right) and the WatchPilot remote control (top, center).
Hearing aids are made with stainless steel, brightly colored casings, and even encrusted with semi-precious stones.
Consequently, hearing aids were able to provide amplification of sound to those even with severe to profound hearing loss. Carbon hearing aids, while effective for moderate losses, had limited amplification and poor-to-moderate sound fidelity. These illustrations of devices from a 1920s Siemens Halske catalog show a wallet hearing aid and aids concealed in ladies’ handbags. This efficiency translated into greater acoustic gain and hence yielded greater benefit for hard of hearing and deaf users. Within a few years of the introduction of the BTE, the BTE overtook the eyeglass hearing aid model in hearing aid sales in the United States.
In February 1956 Dahlberg Electronics introduced the D-10 Magic Ear, a three-transistor BTE (behind-the-ear) hearing aid.
In contrast to similar devices of the 1950s, the emphasis is on convenience and performance, rather than concealment.
Where moisture conditions are excessive, the sensitive microphone and receiver may even become inoperable. The Hal-HenĀ® Dri-Aid? Kit-Junior removes daily accumulation of moisture in the hearing aid, earmold and tubing. Before retiring for the evening, place hearing aid inside jar on top of the foam pad and close cover securely. Coincident with the change from mechanical to electrical designs were advances in technology that paved the way for innovative designs of concealed hearing aids and allowed for manufacture of hearing aids at more affordable prices.
The model CA, introduced in 1944, is a two-piece vacuum tube aid with a cord from the receiver to the earpiece and a cord leading to the two batteries. Overnight the silica gel crystals adsorb moisture, leaving hearing aids and accessories fresh and dry for the next morning. Before retiring for the evening, place hearing aids inside the heavy-duty sealable pouch with the drying agent and close the pouch securely.
Remove hearing aid the next day when ready to use. International Customers, ROHS compliant Dri-Aid? products are available upon request.

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