Would you have made the grade as a radio technician 80 years ago? You can find out from this quiz in an ad in the July 1940 issue of Radio Craft magazine. Based upon these symptoms, can you figure out what’s wrong? If you graduated from National Radio Institute’s home study course, you would undoubtedly identify the problem right away.

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We’ll give you 24 hours to think about it, and then post the correct answer tomorrow.