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Radio Data Sheet 336 - Belmont Radio Model 6D111, Series A
June 1946 Radio-Craft

June 1946 Radio-Craft

June 1946 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

Belmont Model 6D111 Radio (eBay image) - RF Cafe

Belmont Model 6D111 Radio (eBay image - scroll down on page)

The Belmont Model 6D111 tabletop radio must have been very popular because there are many of them still available - in both white and brown - for purchase on eBay. Since radios, televisions, phonographs, tape players, etc. were considered serviceable items back in the vacuum tube days, magazine such as Radio-Craft often published Radio Service Data Sheets with basic specifications, alignment information, and a schematic. Companies like Sams Photofact sold more comprehensive data packets, but these abbreviated datasheets were convenient for do-it-yourselfers and smaller service shops that could not afford a subscription to Sams. Since there are still many people who restore these vintage radios, I post these Radio Data Sheets to help preserve the history. 

Radio Data Sheet 336 Belmont Radio Model 6D111, Series A

Tuning range: 530 to 1650 kc.

I.F.: 455 kc.

Power consumption: .35 watts

Sensitivity (for 0.05 watt output): 10 microvolts average

Selectivity: 55 kc broad at 1000 x signal at 1000 kc

 Maximum power output: 1.0 watt

Undistorted power output: 0.8 watt

Voice coil impedance: 3.2 ohms

Alignment Procedure

  • No aligning adjustments should be attempted until all other possible causes of trouble have been thoroughly checked.
  • Chassis must be removed from cabinet for proper alignment. Slight adjustments of the oscillator and antenna circuits can be made, without removing the chassis through two holes provided on the bottom of the cabinet. 'The two adjustments screws can be reached with a long insulated screwdriver.
  • It is important tune during alignment the loop antenna be maintained at the same distance from the chassis as when the chassis is installed in the cabinet.
  • Turn volume control to maximum for all adjustments.
  • Connect ground post of signal generator to B- of radio through a 0.1 uf condenser.
  • Connect dummy antenna value in series with generator output lead.
  • Connect output meter across primary of output transformer.

Belmont Radio Corporation: A Brief Overview and Historical Context

Belmont Radio was a leading American manufacturer of radio equipment during the 1920s and 1930s. The company was founded in Chicago, Illinois, in 1923, by Harold J. Belmont, and quickly became one of the largest radio manufacturers in the United States.

Belmont Radio was known for producing high-quality, affordable radio sets that were designed for both residential and commercial use. The company's radios were characterized by their distinctive cabinet designs, which were made from beautiful, handcrafted woods and came in a variety of styles and finishes. Belmont Radio's radios were also equipped with advanced technology, such as high-voltage power supplies, which allowed them to produce clear, powerful sound.

Belmont Radio was a major player in the commercialization of radio, and the company played a key role in the growth of the radio industry during the 1920s and 1930s. The company was an early adopter of the use of advertising to promote its products, and its innovative marketing campaigns helped to bring radio to a wider audience. Belmont Radio also played a role in the establishment of the National Broadcasting Company (NBC), which was founded in 1926, and was a major factor in the growth of commercial radio broadcasting.

In addition to its contributions to the radio industry, Belmont Radio was also a leader in the development of new technology. The company was one of the first to develop the "breadboard" radio set, which was easy to assemble and repair. This innovation made radio more accessible to a wider audience and helped to increase the popularity of radio as a means of communication and entertainment.

Despite its success, Belmont Radio faced challenges during the Great Depression, and the company eventually merged with another radio manufacturer in the 1930s. However, the legacy of Belmont Radio continues to be felt today, and the company's impact on the radio industry is still remembered.

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Posted September 23, 2021

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of December 28, 2020.

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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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