Sixty years ago this month, the January 1959 issue of Popular Electronics showed how to put together this portable one tube FM receiver. The set used a single 1AG4 tube as a superregenerative detector, and used a penlite cell for the filament and two 22.5 volt batteries to supply the B+.

Even though a superregenerative receiver is best suited for AM signals, it does an excellent job on FM with slope detection. The tendency of the set to radiate was put to advantage in the instructions for calibrating the dial. The article suggested using a second receiver, tuning it to 88, and then tuning the portable until the rushing sound was heard on the other receiver.