The December 2023 issue of IEEE Spectrum is here!

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Book: The History of Radio, in Pictures and Words

A coffee-table book from the American Museum of Radio and Electricity chronicles five centuries of progress

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RADIO REPAIR: Where there are radios, there are radio tubes, and where there are tubes, there are devices for testing them. The Supreme 400B Radio Diagnometer, made by the Supreme Instruments Corp., of Greenwood, Miss., is a particularly fine example of the sort of radio analyzer used by early radio repairmen. It measured AC volts, DC volts, milliamps, and capacitance.
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