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2. 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.

3. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   L – 450 mA AC/DC series heater; was shifted here from Y; M – 1.9 V, directly heated; N – 12.6 V, indirectly heated; O – Cold cathode; by 1955 this also included semiconductors as these had no heater; Philips sold a family of 150mA series heater tubes under this letter in South America [7] P – 300 mA AC/DC series heater; Q – 2.4 V ...

4. 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 ...

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...

   Two or more elements in a single envelope were handled by adding letters after the heater identifier, in alphabetical order, so an ECH35 is a 6.3 volt heated triode plus a hexode with an octal base; a PABC80 is a Noval 300mA series-heater combination of a single low-power diode A, a pair of diodes with common cathode B, and a triode C.

7. 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]