Post #2244322
2023-04-07 02:03 UTC
@tubetime@mastodon.social The lovely HP 3400a RMS voltmeter (1964) uses one of these in the input amplifier!
https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1964-01.pdf
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2023-04-07 02:03 UTC
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