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Three New hp Audio Oscillators - Vintage 1956-02
https://www.radioexperimenter.us/1956-02/three-new-hp-audio-oscillators.html
YEAR after year the simple, reliable ~hp-R-C audio oscillator remains one of the work horses of the electronics laboratory. The Hewlett-Packard …
Model 200A Audio Oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/002-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 200A began as the subject of Bill Hewlett's master's thesis at Stanford University in the late 1930s.
HP Virtual Museum: Model 200A audio oscillator, 1939 …
https://www.hp.com/hpinfo/abouthp/histnfacts/museum/earlyinstruments/0002/0002history.html
They built the first Hewlett-Packard oscillators in Dave's rented garage on Addison Avenue in Palo Alto, California. 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.
Audio & Test Oscillator - HP Memory Project
http://www.hpmemoryproject.org/wb_pages/wall_b_page_10a.htm
Audio Oscillator Introduced in the 1961 catalog, the 204B was the very first fully transistorized and battery-operated HP audio oscillator. In the beginning of the sixties, the main and most visible advantage of transistors over vacuum tubes was frequently brought to the foreground in publicity for a new instrument.
Model 200B audio oscillator, 1939 - Hewlett Packard …
https://www.hpe.com/us/en/about/history/innovation-gallery/008-product.html
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 the Model 200A audio oscillator in action, he asked Bill Hewlett to make some modifications to it, and the Model 200B was born.
Early Audio Oscillators - HP Memory Project
http://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
Three Members of the 1945, HP Model 200 Audio Oscillator family From Top to Bottom: HP 202D, HP 200D, HP 200i Wider Frequency Range The 202D shown on the right picture (top of the pile,) lowers the first frequency range of the Model 200 family down to 2 Hz . The 200D (middle) covered from 7 Hz to 70 khz in four overlapping ranges.
Audio Oscillator 200A Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200a.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 200A began as the subject of Bill Hewlett's master's thesis at Stanford University in the late 1930s.
hewlett-pa: The HP 200 Audio Oscillators Series
https://www.radiomuseum.org/forum/hewlett_pa_the_hp_200_audio_oscillators_series.html
-hp- Resistance-tuned Audio Oscillators provide an excellent source of voltage for accurate bridge measurements. The output is sufficient to drive signal generators and other equipment requiring considerable power. Certain models ate also adapted to work in the supersonic range.
Hewlett-Packard HP-200C audio oscillator - Ohio University
https://people.ohio.edu/postr/bapix/HP200C.htm
Output for the 200C is specified as 100 milliwatts, 10 volts into a 1000 ohm load. Although this is labeled an audio oscillator, and it does indeed cover the full audio spectrum, its upper range is well beyond audio, in the VLF radio range at 200 KHz. Repairs The HP-200C was in rather rough condition and had not been powered for many years.
Hewlett-Packard HP-200A audio oscillator
https://people.ohio.edu/postr/bapix/HP200A.htm
(Link is to the HP history site detailing the 200A) . Like the other HP oscillators, the HP200A is a Wien bridge resistance-tuned audio oscillator using the light-bulb stabilized negative feedback circuit designed by William Hewlett while doing graduate work at Stanford. (Patent #2268872. Application filed in 1939 and granted in 1942).
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