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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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.


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.




Posted September 23, 2021

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