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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
Bill's technical drawing of the HP 200A audio oscillator dated January 26, 1939. Bill and Dave started their business together and named it with the toss of a coin. They built the first Hewlett-Packard oscillators in Dave's rented garage on Addison Avenue in Palo Alto, California.
Hewlett-Packard HP-200C audio oscillator - Ohio University
https://people.ohio.edu/postr/bapix/HP200C.htm
Hewlett-Packard HP-200C audio oscillator. After repairing a couple of Hewlett Packard vacuum tube voltmeters, I read up on some of the company history. I was able to locate a HP-200C oscillator. This HP-200C is very close in design to the company's initial product. It is a Wien bridge resistance-tuned oscillator with the famous light-bulb ...
Hewlett-Packard 209A 4Hz-2MHz Audio Oscillator
https://www.kenrockwell.com/audio/hp/209a.htm
The Hewlett-Packard HP 209A is probably the world's most useful and versatile general-purpose audio oscillator. You'd be hard pressed to pay more than $100 for it at eBay (see How to Win at eBay).. The 209A stands out because it's small, light, simple to operate, and most importantly, sweeps directly and precisely across the right ranges for audio with a minimum of band …
Hewlett-Packard HP-200A audio oscillator - Ohio University
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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