Fifty years ago this month, the October 1966 issue of Popular Electronics carried this ad for the venerable Knight Kit Star Roamer receiver.  It used four tubes, a selenium rectifier, and two diodes to cover 200-400 kHz longwave and the broadcast band through 30 MHz.  It was an ideal first receiver for the shortwave listener.  Despite the low price, in contrast to similar sets of the era, it did contain a power transformer to keep the chassis isolated from the AC line.

In another post, I have a link to a review of this set.

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