Simple 1962 Shortwave Tuner

1962SpringRadioTVExp4This young man is pulling in the shortwaves courtesy of an extremly simple circuit which appeared in the Spring 1962 issue of Radio-TV Experimenter.

The radio consisted of a crystal set, feeding into an audio amplifier module. The amplifiers were available from Lafayette and other retailers, and drove a speaker. The receiver itself consisted of just a germanium diode, along with coil and capacitor. The coil is wound on a ferrite core, and is seen protruding from the top of the set.

Despite the simplicity, the author was able to pull in signals from the strong European shortwave broadcasters with only a short antenna and ground. The set tuned about 3.5 to 7 MHz.

1962SpringRadioTVExp5



1942 One Tube Receiver

1942MayRadioCraftpEighty years ago this month, the May 1942 issue of Radio Craft showed how to put together this simple one-tube receiver. Being a battery set, there was no need to worry about hum, and the batteries were inexpensive. The B+ voltage was only 7.5 volts, so even with a large dry cell for the filaments, the battery cost was only 58 cents.

The set used a 1S4 tube as regenerative detector. It had two bands, which were switched by moving an alligator clip on the antenna coil. The overall tuning range was 480 kHz through 2.5 MHz, meaning that it covered the entire broadcast band, plus a little bit above and below. Thus, the set could also be used to pull in ships as well as police broadcasts.

1942MayRadioCraftS



1947 Three-Tube Regen

1947AprRadioNews6Seventy-five years ago this month, the April 1947 issue of Radio News, showed how to construct this three-tube (plus rectifier) regenerative receiver for the broadcast band and shortwave. Five plug-in coils covered the standard broadcast band, as well as the 160, 80, 40, and 20 meter ham bands, as well as adjoining shortwave broadcast frequencies.

The article noted that since the war ended, interest in shortwave had reached a new high, and this set provided a simple way to catch these signals. Due to scarcity of power transformers, and AC-DC design was used, with a 35Z5GT rectifier.

The radio itself consisted of a 12SJ7 regenerative detector, 12J5 first audio stage, and 50L6GT output, which provided loudspeaker volume to a dynamic speaker.

1947AprRadioNews7



1937 Built-in Radio

Screen Shot 2022-04-28 at 12.36.09 PMEighty five years ago, this couple are enjoying the luxury of a built-in radio, thanks to a little ingenuity by a reader of Popular Mechanics, who sent in this idea for the April 1937 issue.  A reader took one of the magazine’s designs for an AC-DC midget receiver, modified the panel dimensions slightly, and built it into a modernistic bookcase.



1962 Stereo Headphones

1962SpringRadioTVExp

Among the youth of America, headphones are more than a means of delivering music. They are now a status symbol, to the point where there have been murders over popular brands of headphones. Here are some popular brands, and note the price tags:


Sixty years ago, this young man was a trendsetter, and we can only conclude that he was the coolest kid in class, since he was the first to have a pair of stereo headphones. Since there was no such thing on the market, he made his own. In addition to undoubtedly being a chick magnet, they probably sounded better than the expensive ones today. The plans were contained in the Spring 1962 issue of Radio-TV Experimenter.

The speakers were actually 3-inch replacement speakers for a transistor radio, but since they were driven at such a low level, there was very little distortion. And the response could be adjusted by means of a cardboard baffle. Bass notes went through the cardboard just fine, but to adjust the response at the high end of the range, the size of the hole could be varied. The stylish design was made with plastic cups, cardboard, foam rubber, and tempered brass wire. It was all held together with a little bit of contact cement.

1962SpringRadioTVExp2



Some links on this site are affiliate links, meaning that this site earns a small commission if you make a purchase after clicking the link.

1942 Radio Programs

1942Apr27PghHere’s what you would have heard on the radio 80 years ago today, from the Pittsburgh Press, April 27, 1942. In addition to the broadcast band listings, the paper carried shortwave listings for programs from Moscow, London, Rio de Janeiro, Vatican City, Lima, and Guatemala City.

To see a larger version, click on the image above.



Navy Needs 500,000 Model Airplanes: 1942

1942AprBLEighty years ago this month, this naval officer was explaining to these scouts the finer points of model airplane construction. But it wasn’t just fun and games. These model airplanes were vital to the Navy’s training program, and Secretary of the Navy Frank Knox had called upon the youth of America to make a half million scale models–10,000 each of 50 different fighting planes.

In the April 1942 issue of Boys’ Life, Chief Scout Executive James E. West stressed how Scouts were especially equipped to handle this call. Models were had to be exact replicas of the ally and enemy planes, and were to be built to a precise scale of 1:72. At this scale, a model 35 feet away is identical to the true airplane at just under half a mile. Thus, Navy men could use these models for aircraft recognition, range estimation, formation flying, and other phases of the training program.

1942AprBL2Inspectors would review each model, which had to be perfect. Upon passing inspection, the model planes would immediately be put into service for training. Plans would be in the possession of schools, and the Navy pointed out that modern war was so complex that it demanded the skills of all, including the boy of 12, to provide some of the services and materials needed by our forces.

According to the Navy, “it is scarcely necessary to stir the interest of American boys and girls in aviation, since many of them expect to grow up to be pilots, and this project channels that interest toward an educational objective of immediate value.”

Elsewhere in the same issue, to give Scouts a head start, appeared the guide at left to recognizing some of the enemy’s planes.



1932 Grocery Prices

1921Apr25AandPFor a snapshot of grocery prices during the Great Depression (and a look at what was on the radio), this ad for A&P appeared in the Washington Evening Star 90 years ago today, April 25, 1932.

FDR had just taken over as President the month before, and the Bank Holiday of March 6-13 was still fresh on everyone’s minds. The prices look low, but there’s been a lot of inflation since then. According to this online inflation calculator, one dollar in 1932 is the same as $20.99 in today’s money. So the ground beef for 17 cents a pound is the same as $3.57 a pound in today’s money. Bacon was 13 cents a pound, the equivalent of $2.73 a pound today. Those prices weren’t too bad, but the can or corn or beans sounds like a bargain at 4 for a quarter, but that’s the same as $1.31 a can. Coffee was 19 cents a pound, and cigarettes were 12-1/2 cents per pack.

For those who didn’t like to cook, you could buy a 16 ounce jar of freshly prepared chicken and noodle dinner for 29 cents, ready to heat up at home. But you would pay a premium for not knowing how to cook, since that was the equivalent of over $6 in today’s money.

If you were shopping for your family’s dinner, what would you buy?

The ad also points out a time change for two radio programs.  Apparently, New York, where the programs originated, had just switched to Daylight Savings Time, resulting in a time change for the live program in Washington.  The store sponsored “Our Daily Food,” a program for tips for homemakers, at 8:45 AM.  And on Monday evenings at 8:00, they were the sponsor of the A&P Gypsies, which ran from 1924-36.



1937 Philco Phone Intercom

1937AprRadioTodayEighty-five years ago this month, the April 1937 issue of Radio Today contained this Philco ad reminding dealers of the profits to be made selling intercom systems, specifically the Philco Phone.

A set of two stations sold for $49.50, and additional stations were available for $10 each. The ad noted that even small offices, such as one or two doctors or dentists and a receptionist, could benefit from the set. And businesses such as garages, restaurants, and theaters could put themto good use.

And it was an easy sale for the dealer, with no trade-ins, no expensive installation, or service worries.

And there was even an untouched market in the “better homes” in the community.



Last Prewar Radio

1942MayRadioRetToday marks the 80th anniversary of the end of civilian radio production in the U.S. for the duration of World War II, and shown here is the last radio to roll off the RCA assembly line before the company switched over exclusively to defense production.

RCA was actually ahead of schedule, and this radio-phono was manufactured in Camden, N.J., on April 7, 1942. The chassis had been completed on March 5.

This last set was donated to the Georgia Warm Springs Foundation, where it would uplift the spirits and morale of the young patients there.

The picture appeared in the May 1942 issue of Radio Retailing.