Eighty years ago, the October 1945 issue of Radio Craft showed this circuit for a simple one-tube portable receiver. Almost any tube could be used, including the 1S5, 1A5-G and 1N5-G. It had been sent in to the magazine by one Harold J. Shaffer of San Francisco, who noted that the regenerative circuit, while unconventional, proved to be unusually stable. For that reason, the set could be carried around and provided pleasant headphone reception for local stations.

L1 was a spiderweb loop, and Shaffer intentionally made the set large so that it could have a large loop. The other two coils were wound on a one-inch tube. The A battery was a flashlight cell, and while this circuit used 45 volts, the B battery could be as low as 15 volts.