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De Forest Radio Company Advertisement
December 1931 QST Article

December 1931 QST

December 1931 QST  Cover - RF CafeTable of Contents

Wax nostalgic about and learn from the history of early electronics. See articles from QST, published December 1915 - present (visit ARRL for info). All copyrights hereby acknowledged.

Lee de Forest Signature on Audion Patent - RF Cafe de Forest Radio Company Stock Certificate (via BullMarketGifts.com) - RF Cafe

Lee de Forest, inventor of the Audion vacuum tube, created a business called De Forest Radio Company (although maybe he "didn't build that" per a certain presidential mindset). This advertisement for his company's electron tubes appeared in the December 1931 edition of the ARRL's QST magazine. If you research Lee de Forest, you will find his name spelled in many different forms: de Forest, De Forest, deForest, DeForest, Deforest, to give a few. When in doubt, go straight to the source, which in this case is the signature that de Forest placed on his patent applications - he used "de Forest." Note that the official company name, according to the advertisement address at the bottom, is "De Forest Radio Company," (space used) yet the text of the copy uses the form "de Forest" (no space), and the marking on the base of the tube says, "de Forest." Sometimes marketing companies screw up, so I went searching for a more reliable source - the name given on the company's stock certificate. Sure enough, "de Forest" was the official name.

Below the ad is a broadcast made by Jean Shepherd from station WOR in New York in 1968, relating the time when he met Lee de Forest during WWI when Shepherd was 17 years old. Jean Shepherd, if you don't know, is the guy who originated the story that is the basis of "A Christmas Story," one of my favorite Christmas movies.

De Forest Radio Company Advertisement

de Forest Radio Company Advertisement in December 1931 QST Magazine - RF Cafe

Dry Battery Tubes Attain A. C. Performance.

A new filament makes this possible for the first time.

Remember, There's an Audion for Every Radio Need

Typical of original and unrelenting DeForest research and engineering is the foregoing filament. Such efforts mean a DeForest version of every standard and special type receiving or transmitting tube, always incorporating obvious refinements and improvements to make it a worthy successor of the Audion or original radio tube. Write for literature describing DeForest receiving and transmitting tubes.

60% greater emission area gives higher emission longer service life greater efficiency than nickel with the same filament input voltage and temperature and is one-third as micro phonic.

30% greater diameter filament gives stronger filament more accurate alignment more uniform tension than Nickel with consistent life of 1000 hours and more. New DeForest Types430-31-32-99-20 with cobalt alloy filament.

Write for literature describing DeForest receiving and transmitting tubes.

After all, there's no substitute for 25 years' experience.

De Forest Radio Company - Passaic, New Jersey

Export Department, 304 East 45th Street, New York City

Say You Saw It in QST - It Identifies You and Helps QST

Radio Personality Jean Shepherd Comments on Meeting Lee de Forest


Mike Adams Presents Lee de Forest King of Radio Television and Film

These articles and advertisements appeared in various issues of vintage electronics magazines.



Posted July26, 2019
(updated from original post on 10/26/2012)

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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