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2. Optonica - Wikipedia

   en.wikipedia.org/wiki/Optonica

   Optonica amplifier (SM-3636) and tuner (ST-3636) from 1978. The Optonica brand was created and first launched by Sharp of Japan in 1975 to compete in the high-end audio market along with established brands such as Sansui Electric, Sony, Panasonic, Sanyo, Yamaha, Nakamichi, Onkyo, Fisher Electronics, Technics (brand), Pioneer Corporation, Kenwood Corporation, JVC, Harman Kardon and Marantz.

3. Tuner (radio) - Wikipedia

   en.wikipedia.org/wiki/Tuner_(radio)

   Marantz 2050L AM/FM stereo tuner (USA; 1978-1980) [1]. In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker.

4. WEGA - Wikipedia

   en.wikipedia.org/wiki/WEGA

   In 1975, it was acquired by Sony Corporation. [2] They were then known throughout Europe for stylish and high-quality stereo equipment, designed by Verner Panton [3] and Hartmut Esslinger. [4] Sony continued to use the WEGA brand until 2005, when liquid-crystal displays superseded the company's Trinitron aperture grille-based CRT models. [5]

5. List of Sony products - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_products

   Sony Olympus Medical Solutions Inc. was founded on April 16, 2013, as a cooperation between Sony (owns 51%) and Olympus (owns 49%) with a goal to develop, design and sell surgical endoscopes with 4K+ resolution and 3D technologies. [1]

6. AV receiver - Wikipedia

   en.wikipedia.org/wiki/AV_receiver

   An audio/video receiver (AVR) or a stereo receiver is a consumer electronics component used in a home theater or hi-fi system. Its purpose is to receive audio and video signals from a number of sources, and to process them and provide power amplifiers to drive loudspeakers , and/or route the video to displays such as a television , monitor or ...

7. Tuned radio frequency receiver - Wikipedia

   en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

   A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.