Seventy-five years ago, the April 1951 issue of Radio Electronics showed how to construct your own oscilloscope. The magazine pointed out that many were daunted by the prospect, but a basic scope for work on AM and FM radios was well within the capabilities of the average builder. The model they show used five tube, including rectifier, plus the CRT.

These days, you don’t need to break out the soldering iron or track down those five tubes. You can go to Amazon and get a pocket-sized version.

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