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The AN/PRC-77 entered service in 1968 during the Vietnam War as an upgrade to the earlier AN/PRC-25.It differs from its predecessor mainly in that the PRC-77's final power amplifier stage is made with a transistor, eliminating the only vacuum tube in the PRC-25, as well as the DC-DC voltage converter used to create the high plate voltage for the tube from the 15 V battery.
Electro-Voice RE-27N/D microphone. In 1963, EV received an Academy Award for their 642 Cardiline shotgun microphone, the first ever given for an audio product. [7] Electro-Voice launched its RE Series of microphones in the 1960s, notably the RE15, which was used extensively by musicians on television shows.
The amplifier (an electronic circuit) increases the amplitude of the electric signal using a power source (battery). The speaker converts the amplified electric signal back into a sound wave. The volume (gain) control is used to adjust the amount of amplification applied to the electric signal and thus, indirectly, controls the sound volume.
It was built for guitarists, portable, and had "Leslie" written on the front. [40] It contained just a single 10-inch speaker, and was designed to be powered by an external amplifier, and contained an additional output for an extension speaker.
Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus One hi-fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
The term referred to any small microphone that could be hooked into the buttonhole of the lapel of a coat. The lapel microphone offered freedom of movement. [2] An early use of the microphone supported by a strap around the neck: telephone operator. The term lavalier originally referred to jewelry in the form of a pendant worn around the neck ...