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Model 200B audio oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/008-product.html
Model 200B Audio Oscillator, 1939. An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment. In 1938, when the sound engineer for the movie Fantasia from the Walt Disney Studios saw ...
HP Virtual Museum: Model 200B audio oscillator, 1939
https://hp.com/hpinfo/abouthp/histnfacts/museum/earlyinstruments/0008/0008sixviews.html
About us All of HP U.S. About us > History > Virtual museum > Early instruments Model 200B audio oscillator, 1939—six views » Company information » About us » ...
HP 200A 200B Manual - HP Archive
http://hparchive.com/Manuals/HP-200A-200B-Manual-1961.pdf
The circuit of the Models 200A and 200B, shown on page 8, can be divided into the oscillator, am- plifier, and power supply sections. The oscillator section includes T1 and T2 and is known as a resistance-tuned oscillator. Basically, this oscillator is a two-stage resistance-coupled am- plifier which is caused to oscillate by the use of a
Model 200AB Audio Oscillator, 1952 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/004-product.html
An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment. The Model 200AB and its sister instrument, the Model 200CD, were introduced at the same time in 1952.
HP Virtual Museum: Model 200A audio oscillator, 1939 …
https://www.hp.com/hpinfo/abouthp/histnfacts/museum/earlyinstruments/0002/0002history.html
Their initial product was the 200A audio oscillator; It sold for $54.40. Similar equipment built by competitors cost between $200 and $600, a whopping price difference that generated a buzz very quickly. The company's first big sale was an order of eight model 200B audio oscillators to the Walt Disney Company.
Audio Oscillator 200AB Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200ab.html
Hewlett-Packard, HP; Audio Oscillator 200AB (1) Hewlett-Packard HP-200AB audio generator. Hewlett-Packard, HP; Audio Oscillator 200AB (1) ... (20 cps to 40 kc) was such that it replaced two of the older HP oscillators, Models 200A and 200B, which were discontinued. This was accomplished without an increase in price.
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