History of the manufacturer
Sargent Co., E.M.; Oakland, CA
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| Name: | Sargent Co., E.M.; Oakland, CA (USA) |
| alternative name: |
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| Abbreviation: | sargent |
| Products: | Model types |
| Summary: |
E. M. Sargent Co. Brand: Monarch At least from 1933 to 1940, E. M. Sargent built typical short wave communication receivers, also used by radio amateurs (HAM radios). Sargent also operated an amateur radio station under the call sign W6SC (1928). An indirect successor company is the Sargent-Rayment Co. which made Hi-Fi equipment. Not to be confused with the E.H. Sargent & Co. of Chicago, predecessor of Sargent-Welch. |
| Founded: | 1924 |
| Closed: | 1948 |
| Production: | - 1940 |
| History: |
E.M. Sargent, an old shipboard radio operator, started the E. M. Sargent Co. in his home in 1924. In 1926, he designed the Infradyne Circuit as a means to circumvent the Superheterodyne Patent (see forum). A couple of early receivers, the "Long-Distance De Luxe" and the SW201 were produced in 1930/1931 by an affiliate company, the Radio Constructors Co. Later Sargent built normal superhets, for instance model 11.MA and some others - most often commercial double conversion sets. In 1934 the company moved to its definitive address, at 212 Ninth St., where they operated until the production of their last receiver in 1940. In 1948 Sargent sold his stock to L.C. Rayment, who formed with his son the Sargent-Rayment Co., to produce hi-fi equipment. E.M. Sargent died in 1948 at the age of 56. |
| Country | Year | Name | 1st Tube | Notes |
|---|---|---|---|---|
| USA | 36 | 10 Monarch | 6D6 | Bc and 3 to 4 SW bands up to 20 Mc. Plug-in coils for wave band change. |
| USA | 25 | SLF6 | Three dials (primary tuning control knobs). | |
| USA | 36/37 | 21MA | Covers 80 kHz - 30 MHz in 7 bands, BFO, regenerative 1st RF stage. | |
| USA | 36/37 | 21AA | 6K7 | Covers 0,55 - 30 MHz in 5 bands, BFO, regenerative 1st RF stage using separate regeneratio... |
| USA | 36 | 11-MA | 6D6 | There are 3 different models Serie 11. this is the 11-MA. The model 11-MA has 7 or 8 sh... |
| USA | 40 | WAC-44 | 6K7 | The model WAC-44 receives 5 bands - from .54 to 31 MHz. IF: 456 kHz, Crystal Filter, 10 tu... |
| USA | 30 | Long-Distance De Luxe | This receiver was actually built by a Sargent affiliate company, Radio Constructors Co. | |
| USA | 31 | Amateur Special SW201 | 1.5 to 30MHz; band switch and bandspread; pentode push-pull AF output. AC, DC, battery mod... | |
| USA | 34/35 | 8-34 | 57 | Coverage: 0.55 to 21MHz in four bands. Two IF stages, BFO; three wire antenna in, bal/unba... |
| USA | 34/35 | Marine 8-34 | 57 | Coverage: 0.2 to 20MHz in four bands. Two IF stages, BFO; three wire antenna in, bal/unbal... |
| USA | 34 | Europa Model 8-34 | Five bands, covering from 0.2 to 20MHz. Variant of the standard 8-34 model. | |
| USA | 38–40 | 51-AK | 6F7 | Five bands, 0.54 to 31MHz. RF and mixer panel trimmers. Triode section of 6F7 used as feed... |
Further details for this manufacturer by the members (rmfiorg):
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The Infradyne Circuit
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Mark Hippenstiel
06.Jul.21 |
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The following is a summary of snippets previously found on the manufacturer's page, which I post here for better readability (and potential discussion). Mark In 1926 E.M. Sargent designed the "Infradyne Circuit" as a way to circumvent the RCA-Westinghouse held Superheterodyne patent and avoid an inevitable lawsuit. During the 1920s, no other company but RCA could legally sell superhets - or then "cross-licensed" companies, i.e. GE or Westinghouse. Kits could sometimes avoid legal problems. The Infradyne was originally sold only as a kit and by carefully avoiding the term "Superheterodyne", Sargent kept everything legal. A few companies took their chances with legalities and sold completed Infradyne kits, such as the Remloc Radio Co. Bruce McCalley wrote: "The Infradyne Receiver Introduced in the August 1926 issue of Radio, and was featured for several issues after that. The Infradyne was one of the more unusual designs of the early days of radio. In the early days of radio there were a good number of odd-ball designs introduced. Some of these were to enable better performance, some were to save on the number of tubes required, and some seem to defy reason. The Infradyne, to this writer, seems to fit the last of these categories." ... "The IF amplifier, called the "Infradyne Amplifier" used three '99 tubes on a separate chassis. It was manufactured by Remler, a division of Gray and Danielson Mfg. Co, San Francisco, California." By the way: Remler Company, Limited, was founded in 1918 and was in business until 1988. -- The infradyne circuit was not really integrated in commercial production and within months it was no topic anymore. Before some adds in the journal "Radio magazine" from different makers stated that their set is suitable for the Infradyne. The term has a "new life" in very modern technique since about 1990 - Publication: "Katsushi Iwashita, et al., Chromatic Dispersion Compensation in Coherent Optical Communications, Journal of Lightwave Technology, vol. 8, No, 3, Mar. 1990, pp. 367-375. Chris Cho-Pin Li, et al., Comparison of Coded and Uncoded QPSK Intradyne and Heterodyne Receivers, IEEE, 1993 pp. 1891-1895." |
End of forum contributions about this manufacturer/brand
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