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Model 200A Audio Oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/002-product.html
Model 200A 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. The Model 200A began as the subject of Bill Hewlett's master's thesis at Stanford ...
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.
HP 200A Manual - HP Archive
http://www.hparchive.com/Manuals/HP-200A-Manual-1951.pdf
The Model 200A Audio Oscillator consists of an oscillator section, an amplifier section and a power supply. The oscillator section (tubes V1 and V2) is a resistance-tuned type cir- cuit. Basically, this oscillator is a two-stage resistance-coupled amplifier which is caused to oscillate by the use of a positive feedback network.
Audio Oscillator 200A Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200a.html
The 200A audio oscillator of 1939 is the first product of Hewlett Packard (HP). A US patent Nr. 2268872 was granted to W.R. Hewlett in January 6th 1942, filed in July 11th 1939. An audio oscillator is an instrument that generates one pure tone or frequency at a time.
Hewlett-Packard HP-200A audio oscillator
https://people.ohio.edu/postr/bapix/HP200A.htm
Hewlett-Packard's first product, the HP-200A audio oscillator. After repairing several other Hewlett Packard oscillators such as the HP-200C , the HP-200CD , and the HP-200AB , I chanced upon this HP-200A which is the company's original product. (Link is …
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