HH Scott 99-D

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The HH Scott 99-D was a vacuum tube, designed by Hughes Research Laboratories (then known as HH Scott Labs) in the late 1950s to early 1960s. It was a high-gain, high-frequency device that could operate at extremely low voltage levels, making it suitable for use in portable and high-packaging density integrated circuit applications. The 99-D was a dual-gate field-effect transistor (FET) and utilized a degenerativesource-drain (DS) circuit to improve the device's gain-bandwidth product. This transistor was also designed with a unique gate structure, which allowed for fast response times and low noise characteristics.The HH Scott 99-D was widely used in early integrated circuit designs, especially in frequency multiplier circuits, mixers, and microwave amplifiers. Its low voltage operation and high-frequency capabilities made it a popular choice for applications where power consumption and size were critical design parameters.Today, the HH Scott 99-D is considered a historical artifact of the early days of VLSI (Very Large Scale Integration) technology. While modern integrated circuits have largely replaced vacuum tube technology, the development of the 99-D and other early FETs paved the way for the development of more advanced semiconductor devices, ultimately leading to the vast array of integrated circuits that we see today.