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  2. Audio induction loop - Wikipedia

    en.wikipedia.org/wiki/Audio_induction_loop

    A hearing loop consists of one or more physical loops of cable which are placed around a designated area, usually a room or a building. The cable generates an electromagnetic field throughout the looped space which can be picked up by a telecoil-equipped hearing aid, a cochlear implant (CI) processor, or a specialized hand-held hearing loop receiver for individuals without telecoil-compatible ...

  3. List of Mullard–Philips vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mullard–Philips...

    This is a list of European Mullard–Philips vacuum tubes and their American equivalents. Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme.

  4. Miracle-Ear - Wikipedia

    en.wikipedia.org/wiki/Miracle-Ear

    Miracle-Ear, Inc. is a hearing aid and hearing care company consisting of a network of franchised and corporately owned retail locations. The company is a subsidiary of Amplifon, the worldwide leader in hearing care and hearing aid retail based in Milan, Italy. [1] Miracle-Ear's U.S. headquarters are located in Minneapolis, Minnesota. [2]

  5. Hearing aid - Wikipedia

    en.wikipedia.org/wiki/Hearing_aid

    Hearing aid users can use a telecoil (T) switch to hear announcements directly through their hearing aid receiver. A hearing aid and a telephone are "compatible" when they can connect to each other in a way that produces clear, easily understood sound. The term "compatibility" is applied to all three types of telephones (wired, cordless, and ...

  6. Mullard–Philips tube designation - Wikipedia

    en.wikipedia.org/wiki/Mullard–Philips_tube...

    The older Philips system [ edit ] Prior to 1934, Phillips numbers were based on a sequence of one letter to indicate filament current range, followed by one or two digits for the filament voltage, then two digits that gave either the amplification factor (for triodes) or a code beginning with 41 to indicate tetrodes, pentodes and so on. [ 11 ]

  7. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    The following letter indicates the filament or cathode type, or the fill gas or other construction detail. The coding for vacuum devices differs between Philips (and other Continental European manufacturers) on the one hand and its Mullard subsidiary on the other. Philips vacuum devices: A; Microwave tubes: Output power <1W

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    philips 9040 hearing aid specifications manual free pdf vta 600 series