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Development of cryogenic LNAs

Submitter: Bert Woestenburg
Description: The first development of cryogenic Low Noise Amplifiers (LNAs) was in Leiden in the early 70's. The picture shows Jaap Visser and Bert Woestenburg in 1972, in their young and hairy years, measuring a 'parametric' amplifier at liquid nitrogen temperature.
Copyright: ASTRON
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