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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 ...

Audio Oscillator 200B Equipment Hewlett-Packard, HP;

https://www.radiomuseum.org/r/hp_audio_oscillator_200b.html

Model: Audio Oscillator 200B - Hewlett-Packard, HP; Palo Alto. Tablemodel without push buttons, Mantel/Midget/Compact up to 14. Hewlett-Packard's first product, 200A has a range of 20 Hz to 20 kHz and 200B can distribute 35 Hz to 35 kHz. General Radio before was the leader for RC-audio generators and other bench instruments.

HP 200A 200B Manual - HP Archive

http://hparchive.com/Manuals/HP-200A-200B-Manual-1961.pdf

This manual is supplied for use with both the 200A and 200B Audio Oscillators having any serial number below about 41,000. In oscillators with very low serial numbers the values of a few of the parts differ from the values given in the parts list and schematic diagram, for example:

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

The company's first big sale was an order of eight model 200B audio oscillators to the Walt Disney Company. Disney engineers used them to test the channels, recording equipment and speaker systems for its new "Fantasound" sound system. The proceeds from those early sales funded more work that improved each successive model.

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