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2. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945.

3. Microphone preamplifier - Wikipedia

   en.wikipedia.org/wiki/Microphone_preamplifier

   In either instance, the purpose of the microphone preamplifier is the same. A microphone preamplifier is a sound engineering device that prepares a microphone signal to be processed by other equipment. Microphone signals are often too weak to be transmitted to units such as mixing consoles and recording devices with adequate quality.

4. Heathkit - Wikipedia

   en.wikipedia.org/wiki/Heathkit

   Oscilloscope OL-1 from 1954, the company's first with a relatively small 3-inch CRT which allowed for a highly competitive price of US$ 29.50 (equivalent to $335 in 2023) for the DIY kit. [1] Heathkit is the brand name of kits and other electronic products produced and marketed by the Heath Company.

5. Shure SM57 - Wikipedia

   en.wikipedia.org/wiki/Shure_SM57

   Shure SM57 microphones with A2WS windscreens installed on the lectern of former United States President Barack Obama. The microphone kit (two SM57 microphones, windscreens, microphone stands, and black right-angle XLR cables) is referred to as the VIP/high-profile microphone kit. The SM57 is a popular choice of musicians due to its sturdy ...

6. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Battery-powered systems can be used by guides who are speaking to clients on walking tours. Public address systems consist of input sources (microphones, sound playback devices, etc.), amplifiers, control and monitoring equipment (e.g., LED indicator lights, VU meters, headphones), and loudspeakers.

7. Shure - Wikipedia

   en.wikipedia.org/wiki/Shure

   Company history. Shure was founded by Sidney N. Shure in 1925 as "The Shure Radio Company", selling radio parts kits several years after completely manufactured radios became commercially available. The company's office was located at 19 South Wells Street in downtown Chicago, Illinois.