General Radio before was the leader for RC-audio generators and other bench instruments. The incandescent lamp of Volts and 3 Watts in the cathode path stabilized the result very efficient in a way that HP soon became a leader for this type of instrument. Info on HPs page for the beginning of this world known company Hewlett Packard: See also Bill Hewlett's prototype resistance-capacity oscillator from A US patent Nr. Hewlett in January 6th , filed in July 11th
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William Hewlett & David Packard
It was a low-distortion audio oscillator used for testing sound equipment. It used the Wien bridge oscillator circuit, that had been the subject of Bill Hewlett 's Masters thesis. It was also the first such commercial oscillator to use a simple light bulb as the temperature-dependent resistor in its feedback network. The latter is a key technique for achieving a low distortion oscillator. Earlier, Larned Meacham had used light bulbs in bridge circuits to stabilize and linearize oscillators in The product code was chosen to give the impression that HP was an established company. The circuit diagram is shown in Hewlett's patent.
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Something very cool happened at HP HQ this week. Of course it was accepted! Tech history buff or not, you've probably caught on that this is a very important item to HP by now. So what's the significance?