Category Archives: Radio history

Adding a Bulb to a Crystal Set: 1925

One hundred years ago, in the November 1925 issue of Boys’ Life, radio editor Zeh Bouck apparently realized that many scouts already owned a crystal set, and were thinking of upgrading by adding a “bulb”. His column details two methods of doing exactly that. First, he discusses how to replace the crystal detector with a tube, and notes that this option is somewhat less expensive. However, his preference is the second method, namely, keeping the crystal detector as-is and adding one tube as an audio amplifier.  Parts lists are included, and the first method, replacing the detector, would set the scout back $5.80. Adding an audio amplifier would require a transformer, which could cost an additional $1.50 to $5.

He assures that both methods are just about as easy as the A, B, C’s, and he gives detailed instructions.



Liberty Music House Radio Club, Seattle, 1925

If you were in Seattle a hundred years ago, and you were looking for the perfect Christmas present for your family, you couldn’t go wrong signing up for the Liberty Music House Radio Club. You would simply pay five dollars per week until Christmas, at which a fully tested radio would be delivered. It was the way to be sure that a radio would be in operation in the home by Christmas.

The store was located in the Liberty Theatre Building, First Avenue near Pike.  The ad appeared a hundred years ago today in the November 19, 1925, issue of the Seattle Star.



1955 Gaertner One-Tube Radio Kit

Shown here is a one-tube radio kit covering the broadcast band, from the Gaertner Co. of Los Angeles. The battery version was $6.95, and there was also an AC version for $8.95.

It was shown in the November 1955 issue of Popular Electronics, which stated that it could be assembled readily by someone with no previous knowledge of electronics.  The address for more information was  A & M Company, 616 S. Serrano Ave., Los Angeles.



General Television & Radio Model 534 Grand Piano Radio

Eighty-five years ago this month, the November 1940 issue of Popular Science showed off this novelty radio disguised as a miniature grand piano. The volume and tuning knobs were above the keyboard, the the speaker and tuning dial appeared below.

The magazine does not give the manufacturer, but it appears to be General Television and Radio model 534, and if you would like to restore one, it looks like it’s available on eBay.



Armistice Day Blizzard

Armistice Day Blizzard, Excelsior Blvd., West of Minneapolis. Minn. Historical Society photo, NOAA.

Today marks the 85th anniversary of the Armistice Day Blizzard of November 11, 1940. Here are some of our previous posts:

 



Zenith M660A “Explorer” Receiver, 1965

Sixty years ago this month, the November 1965 issue of Electronics Illustrated introduced the Zenith Model M660A “Explorer” receiver.  It covered longwave, the standard AM band, and shortwave, and included a BFO.  The picture here doesn’t really do it credit, but the handsome set really would have been in place in the living room.

You can see the set in operation at this video.

 



1940 Automatic Soldering Iron Switch

This helpful hint appeared 85 years ago in the British Practical Wireless magazine, November 1940. At first, I thought the idea had been sent in by Rube Goldberg, but it was actually one J. F. H. Aspinwall of Wirrall. who sometimes plugged in the soldering iron and forgot about it. His solution solved that problem, and also let him know when the iron was hot enough. He rested a piece of solder between one buzzer contact, with the other end on the iron, perched precariously above the other contact. When the iron was hot enough, the end of solder melted and the piece dropped onto the other contact, completing the circuit and sounding the buzzer.



1940 Bike Radio

Eighty-five years ago, this couple enjoy a favorite radio program as the pedal the streets and roads, thanks to a three-tube radio that works in practically the same manner as a car radio. Two of the tubes are triple purpose, in addition to the power tube feeding the 4-inch speaker. The set came with antenna, mounting hardware, and the battery, which can be seen on the frame.

The radio appears to be the Motorola B-150, which we have previously written about.



1955 One-Tube Reflex Radio

Despite its nondescript looks, this one-tube broadcast receiver from 70 years ago was a good performer. It was designed to be small and efficient. It consumed about the same amount of power as an electric clock, meaning that it could be run constantly. And because of the low power consumption, it put out little heat and could be mounted in a wall or a piece of furniture, without having to worry about ventilation. It was said to put out enough volume to fill the room, but not enough to bother the neighbors.

When tested 100 miles from Chicago, it pulled in all of the major Chicago stations during the day with just a 12 inch antenna. This was accomplished by reflexing the 6AU6 to serve as both RF and AF amplifier. A diode was used as detector, and the rectifier was selenium.  It appeared in the November 1955 issue of Popular Electronics.



Claypool Trio, Indianapolis, 1925

If you were listening to the radio 100 years ago tonight, October 30, 1925, in Indianapolis, you would be able to tune in to the Claypool Trio, composed of Alma Miller Lentz on the violin, Carolyn Turner at the piano, and Consuelo Couchman Rettig on cello. The program was heard on WFBM (now WNDE), and this photo appeared in the Indianapolis Times, October 29, 1925.