I have an interest in electronics from the 1960’s and 1970’s. One rather unique product of that time is a hands-on “building block” approach to putting circuits together, somewhat like the much more recent Legos RCX controller and associated attachments. This article describes the introduction of the Raytheon Lectron series of electronic block kits.
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I actually remember having one of those sets. I suppose it would be valuable today; but in true hacker fashion, once I graduated to breadboards and PCBs I cannibalized the electronic parts for other projects…