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HP 200A - Wikipedia
https://en.wikipedia.org/wiki/HP_200A#:~:text=The%20HP%20200A%20was%20the%20first%20product%20made,the%20subject%20of%20Bill%20Hewlett%20%27s%20Masters%20thesis.
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 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
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 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-Packard HP-200A audio oscillator
https://people.ohio.edu/postr/bapix/HP200A.htm
HP-200A sending a 10 KHz signal to oscilloscope. The HP-200A is very solidly constructed with an audio transformer that is larger than its power transformer. The manual recommends keeping the output level control to a bit under maximum to limit distortion to its specification of less than half of one percent. This was confirmed by scope observation.
HP 200A Manual - The Hewlett Packard Archive
http://www.hparchive.com/Manuals/HP-200A-Manual-1951.pdf
The Model 200A Audio Oscillator is a general purpose oscillator which uses the resistance-tuned circuit to generate alternating current voltages from 35 to 35,000 cycles/sec. This audio oscillator provides a source of voltage for amplifier testing, audio response &-Ea~smi4&szBc,. lout& speak- resonance tests, and a voltage
Early Audio Oscillators - HP Memory Project
https://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
The 200A Evolution. Starting from the innovative concept of the 200A oscillator, many instruments have been built to fill in many gaps in the electronic industry of the 40s and 50s. New options added to the original circuit basis, have generated a complete signal sources product line to solve different measurements needs.
Audio & Test Oscillator - HP Memory Project
http://www.hpmemoryproject.org/wb_pages/wall_b_page_10a.htm
Evolution of the Bill Hewlett's 200A Audio Oscillator . By the beginning of the 1960s Bill Hewlett's original RC Oscillator had already found many usages in various kinds of electronic instruments. In the 1960 general catalog, the most visible part of this evolution is …
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