![]() There isn’t much inside the unusual round case (another clue, by the way), but there are some vintage parts we haven’t seen in quite awhile. The shape of the plug at the end of the wire is also a clue, we think. We’ll also drop the hint that it is made for use with AC, not DC. Looking at it, you can guess that it is meant for high voltage use and, in fact, it is rated for up to 25 kV. ![]() We aren’t going to spoil the surprise over what the device is, but we will share that he does reveal what it is very early in the video, so there’s not much of a tease. What’s round, has what looks like a vacuum tube in the center, and was made in the 1950s by HP? We don’t know either, but restored one and shows us this mystery instrument in a recent video that you can see below.
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