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A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
From 1994 until the mid-2010s, Bose sold several 5.1 channel audio systems, which used five small satellite speakers and a subwoofer. Early systems used an in-built CD player, followed by a DVD player and later models were AV receivers, which used external audio sources.
The TR-1 is a superheterodyne receiver [2] [11] with four n-p-n germanium transistors and one diode. It contains a single transistor converter stage, followed by two intermediate-frequency amplifier stages. After detection, a single-transistor stage amplifies the audio frequency. All amplifier stages use common emitter amplifiers. Stages are ...
Fisher's first receiver was the model 500, a mono AM/FM receiver using two EL37 output tubes. It had a brass-plated face panel and an optional mahogany or "blonde" wooden case. This early mono receiver should not be confused with the later stereo tube receiver models, the 500B and 500C. [9]
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.
Stereo receiver: Combines a preamplifier, amplifier, and often a tuner into one unit. Receivers often have built-in support for streaming services and multi-room audio. AV receiver: Also known as a home theater receiver, connects to a TV and decodes multiple audio channels to power a multi-speaker surround sound system.
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