Wax nostalgic about and learn from the history of early
electronics. See articles from Radio & Television News, published 1919-1959. All copyrights hereby
The Belmont model 5D128 was a
compact, inexpensive tabletop AM radio set. A schematic and parts list for it appeared
in the November 1946 issue of Radio News magazine. There are still many people who
restore and service these vintage radios, and often it can be difficult or impossible
to find schematics and/or tuning information, so I scan and post them whenever
they appear in magazines which I own (almost never from an online PDF, unless I
need some support information). While researching the Belmont 5D128 tabletop radio,
I ran across an excellent video created by Mr. Paul Carlson (see below - note
how the setting looks like he's in the International Space Station), as part of
his Mr. Carlson's Lab series.
Here is a great video of Mr. Carlson
troubleshooting an intermittent noise
problem in a receiver. That "Carlson RF SuperProbe" he
is using looks like a must-have piece of test equipment! Click on the link for another
video showing how to make it. The Classic Radio Gallery page on the
5D128 shows magazine advertisements from other companies such as Airline (Montgomery
Ward), Coronado, Lafayette, Good Year, which rebranded the exact same radio with
their own names.
Belmont Model 5D128
Belmont Model 5D128 Schematic
Belmont Model 5D128 Parts List
Belmont Radio Corporation
Belmont Radio was a manufacturing company that produced a range of radio equipment,
including radios, amplifiers, and speakers. The company was known for its innovative
designs and high-quality products, and was a leader in the radio industry during
Founded in the early 20th century, Belmont Radio began as a small company that
produced simple crystal radio sets. As radio technology advanced, the company expanded
its product line to include more sophisticated radio equipment, such as amplifiers
and speakers. Belmont Radio also developed its own patented radio technologies,
which helped to set it apart from its competitors.
One of the key innovations that Belmont Radio is remembered for is its development
of the "All-Wave" radio, which allowed listeners to receive broadcasts from around
the world. This was a significant advancement in radio technology, as previous radios
were limited to receiving local broadcasts. Belmont Radio's All-Wave radio was widely
popular and helped to establish the company as a leading manufacturer of radio equipment.
In addition to its radio equipment, Belmont Radio was also known for its distinctive,
high-quality speakers. The company's speakers were designed to deliver excellent
sound quality and were popular with both radio enthusiasts and music lovers. Belmont
Radio speakers were used in a variety of settings, including homes, businesses,
and public spaces.
Unfortunately, as the radio industry evolved and new technologies emerged, Belmont
Radio struggled to remain competitive. The company eventually went out of business,
but its legacy lived on through its many innovations and its high-quality products.
Today, Belmont Radio is remembered as a pioneering company that helped to shape
the radio industry and bring the magic of radio to the masses.
Posted March 24, 2023 (updated from original post
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.
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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and text used on the RF Cafe website are hereby acknowledged.