Ninety years ago, the March 1926 issue of Popular Mechanics carried the plans for this simple crystal set. The unique twist about this set was how it was tuned. Two metal plates (made from the lids of tin cans) were positioned such that the coil could be slid in and out. To tune the set, you simply slid it to the correct position.

The article noted that the set had selectivity sufficient to tune out a strong station a few miles away.  The total cost for the parts was fifty cents.

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Seventy years ago, this day’s issue of Life Magazine, March 4, 1946, carried this ad for the RCA model 56X5. The “12,000 Miler” covered standard broadcast and short wave with six tubes, including the rectifier.

I’ve always considered this set to be quite handsome, and it’s also a good performer on both AM and shortwave.  A nice example can be found at the Radio Attic Archives.  And you can see the set in action pulling in some Chicago stations at YouTube.

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Seventy-five years ago, the March 1941 issue of Radio and Television carried the plans for this two-element 20 meter beam in use by R.M. Blanchard, W4FIC. The antenna was constructed of bamboo, with the driven element and director consisting of wires taped to the bamboo. The rotor consisted of a bicycle chain connected to ropes, adjusted on the ground as shown in the diagram below.

Mr. Blanchard reported that the antenna performed well, logging contacts with the Philipines, Guam, and Little America. In addition, the antenna was used for numerous schedules with the Hawaiian Islands.

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Seventy-five years ago, it was a big month for radio servicemen.  The new North American Radio Broadcasting Agreement called for most North American broadcast stations to shift frequencies on March 29, 1941.  The trade press was abuzz with how this could be of benefit to servicemen, who would be called upon to reset the pushbuttons of millions of radios.

The undoubtedly caused a bit of trouble for some shops, since resetting the button really required the station to be on the air on the new channel to make sure the job was done right.  RCA came out with the piece of equipment shown here, in an ad in the March 1941 issue of Radio Today.  For $17.50, the shop could buy the RCA Station Allocator.  It consisted of a signal source with several buttons.  It would then put out a test signal on the given frequency, making short work of the adjustment of the customer’s set.

More information on this piece of test equipment can be found at RadioMuseum.org.  The set was portable, and could run either on AC power or internal batteries, making the house call for this adjustment quite simple.

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Seventy-five years ago, the thrifty radio enthusiast could construct this radio-phono console for only $27.50, following the plans in the March 1941 issue of Popular Science.  Even though the set contained only two tubes, it reportedly boasted all of the features of an eight-tube set.

The receiver consisted of a 12B8GT regenerative detector.  The article noted that the regeneration control could be left at the same setting throughout the entire broadcast band, without the set breaking into an annoying squeal as the owner tuned from one end of the band to the other.

The amplifier for both radio and phono was a 32L7GT feeding a 6-inch speaker.  The dual tube also contained the rectifier, which allowed the transformerless set to run from household power.  The filaments were wired in series, along with a 220 ohm resistor.

The $27.50 price tag quoted in the article included everything, including a pre-made cabinet, the phonograph motor, and pickup.

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