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History of the Audio Amplifier | Sciencing
https://sciencing.com/about-4899502-history-audio-amplifier.html
The first audio amplifier was made in 1906 by a man named Lee De Forest and came in the form of the triode vacuum tube. This particular mechanism evolved from the Audion, which was developed by De Forest. Unlike the triode which has …
Audio Innovations - The First Audio Amplifier
https://stereonomono.blogspot.com/2018/11/audio-innovations-first-audio-amplifier.html
The First Audio Amplifier is the first amplifier to significantly deviate from these design criteria. It is also first commercially available amplifier using the Direct Heated Triode, this being the most linear and load tolerant amplifying device available. …
Early History of the Amplifier – Mission Engineering
https://www.missionengineering.com/early-history-of-the-amplifier/
Beauchamp and Rickenbacke would go on to form the Electro String company, and would create the first production-model dedicated electric guitar amplifier in 1932. After creating this model, the company hired an engineer, Ralph Robertson, to improve their amplifier design.
FIRST AUDIO-AMPLIFIER STAGE - Elements of Radio Servicing ...
https://1library.net/article/audio-amplifier-stage-elements-radio-servicing-william-marcus.yexk8g1q
first audio-amplifier stage In document Elements of Radio Servicing-William Marcus (Page 100-122) Quick Check.—If a wet finger or a plugged-in soldering iron is applied to the input of the first AF stage and a very strong growl comes out of the speaker, the stage is probably functioning properly, and the serviceman moves on to the next stage.
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