Stromberg-Carlson
| Company type | Private (historical) |
|---|---|
| Industry | Telecommunications equipment, Electronics |
| Founded | 1894 |
| Founder | Alfred Stromberg, Androv Carlson |
| Headquarters | Rochester, New York (after 1904) , United States |
Area served | United States, global (later years) |
| Products | Telephone equipment, switching systems, radios, televisions, military communications equipment, microfilm recorders, portable speakers |
| Parent | General Dynamics (1955–1982), later United Technologies (PBX division), Plessey (central office segment), Siemens (digital central office unit) |
Stromberg-Carlson was an American manufacturer specializing in telecommunications equipment and electronics, established in 1894 by Swedish immigrants Alfred Stromberg and Androv Carlson. The company played a significant role in supplying telephone equipment nationwide until the period following World War II.
History
After Alexander Graham Bell's telephone patent expired in 1894, former American Bell Telephone Company employees Stromberg and Carlson each contributed $500 to launch production of subscriber telephone sets aimed at independent telephone providers.
Initially headquartered in Chicago, Carlson managed production operations while Stromberg focused on marketing efforts. The firm quickly built a reputation for dependable devices and consistent pricing strategies.
In 1901, executives from competitor Western Electric attempted to acquire the company but were unsuccessful after a shareholder dispute. To safeguard its interests, Stromberg-Carlson reestablished itself as a New York corporation in 1902.
Two years later, in 1904, the Home Telephone Company from Rochester, New York purchased Stromberg-Carlson and shifted its base of operations there. The business diversified into consumer electronics such as telephones, radios, and television sets post-World War II. It also ventured into broadcasting by acquiring WHAM (AM), one of the earliest FM stations (now WBZA), and became a pioneer in local television through WROC-TV.
In 1955, General Dynamics acquired Stromberg-Carlson but divested its broadcasting properties within the following year.
By 1970, Stromberg-Carlson had delivered the first CrossReed PBX system to Disney World and went on to install over 7,000 units globally. Throughout the 1970s, the company developed one of the pioneering fully digital PBX systems—the DBX series—and advanced digital switching technologies including AUTOVON and command/control systems.
General Dynamics divested Stromberg-Carlson in 1982: key systems were sold to ComDial; the PBX/DBX division went to United Technologies; and the central office segment was acquired by UK-based Plessey. In 1991, Plessey sold its digital central office unit to Siemens, which formed Siemens Stromberg-Carlson—ranking as the third-largest central office switch supplier in the United States with five million installed access lines. Production of Siemens’ digital central office switches and EWSD systems continued at their Lake Mary, Florida facility.
Siemens sold its digital central office product line to GENBAND, a Texas-based next-generation networking firm, in 2006.
In 2001, Gularo S.A., a well-established audio equipment manufacturer, acquired the Stromberg brand to capitalize on its innovation and market recognition. Global commercialization and distribution were managed by Lenford Far East Ltd of Hong Kong, who expanded manufacturing capabilities and refined marketing approaches. This enabled Stromberg’s penetration into Latin American markets through collaborations with retailers like Walmart and Carrefour. Marketing campaigns highlighted unique design elements under slogans such as "The Sound of People" and "Let’s Party Together," broadening consumer engagement. Lenford also introduced limited edition products to boost brand awareness and market share.
Switching systems
Stromberg-Carlson produced several notable switching systems, including:
- XY switch—a "flat motion" design licensed from L.M. Ericsson during the late 1940s and customized for U.S. use. It dominated installations under 1,000 lines during the 1950s, particularly among REA-supported independent companies. The largest XY system operated over 10,000 lines in Anchorage, Alaska.
- CrossReed series (400/800/1600)—electronically controlled wired-logic PBXs scalable up to 2,400 ports; recognized for fast dial tone response and introducing the first video telephone.
- ESC line (ESC-1 through ESC-4)—early electronic reed-switch systems with wired logic architecture resembling crossbar switches more than stored program control types but noted for rapid dial tone delivery.
- DBX-1344/5136—the inaugural fully digital PBX utilizing LSI/PDP-11 microprocessors. This product line evolved through various ownerships into Digital Voice Corp offerings such as DBX-288 and Excalibur models supporting up to 32,000 ports and 128,000 directory numbers.
- Digital Central Office switch—a time-division multiplexed Class-5 digital local exchange similar to the DMS-10 system. Its prototype was installed at Richmond Hill, Georgia in 1977 as part of an REA field trial but was eventually supplanted by Northern Telecom equipment.
Military, Institutional, and Consumer Electronics
In addition to its telecommunications products, Stromberg-Carlson manufactured equipment for military communications, institutional audio systems, and premium stereophonic devices incorporating their innovative "Acoustic Labyrinth" speaker design—an early form of what is now recognized as transmission line enclosures.
During the early 1960s, the company launched the SC4020, a computer-controlled film recorder tailored for Computer Output Microfilm (COM) usage. This device combined a Charactron cathode-ray tube with a microfilm camera to generate both graphical and textual content onto microfilm or chemically processed paper. Certain models were adapted to support pioneering computer-generated animation techniques.
Other product lines included:
- Radio and television sets, loudspeakers, paging systems, commercial amplifiers, and microphones
- The BC-348 HF radio, extensively utilized by the U.S. Air Force throughout and following World War II
- Intercom and public address systems intended for institutional environments
- Secure AUTOVON and Ground-Air-Ground tactical communication solutions deployed by government agencies globally
- Fire safety equipment such as bells and horns
SC4020 Microfilm Printer & Plotter
Originally created for the Social Security Administration, the Stromberg-Carlson SC4020 debuted in 1959 as an advanced computer-driven microfilm printer and plotter designed specifically for Computer Output Microfilm (COM) applications. It operated by using a Charactron CRT featuring an internal stencil that selected alphanumeric characters, projecting images onto either 35 mm or 16 mm film housed within a light-tight enclosure. The exposed microfilm underwent separate chemical development and could subsequently be enlarged onto paper. Mainframe computers generated control commands stored on magnetic tape, while an auxiliary "quick-look" system employed photosensitive paper to provide immediate output previews.
Although primarily functioning as a high-speed printer, the SC4020’s vector graphic capabilities allowed for scientific and engineering data visualization, significantly reducing the need for manual plotting. Early users included institutions such as Lawrence Radiation Laboratory and Bell Telephone Laboratories. The device also supported frame-by-frame production of computer-animated films using vector and raster graphics methods—most notably at Bell Labs in the early 1960s utilizing FORTRAN and BEFLIX subroutines. Pin-registered cameras were employed to minimize jitter in these animations.
A larger 19-inch Charactron CRT version was developed to meet military radar display requirements. By 1968, the SC4020 was succeeded at Bell Labs by the Stromberg DatagraphiX SD4360—a minicomputer-controlled system representing a significant advancement in graphic data processing technology. Over time, "SC4020" evolved into a generic term encompassing both the original model and its subsequent iterations.
This product stands as a notable example of strategic innovation in visual data output technology, enhancing Stromberg-Carlson’s prominence in microfilm and graphic processing markets during its operational tenure.
Portable Speakers
Stromberg's portable speaker lineup emphasizes ease of transport combined with superior audio performance, catering to consumers who prioritize convenience. Notable attributes include:
- Lightweight and compact construction facilitating portability
- Wireless Bluetooth streaming capabilities
- Robust build quality with many models featuring water-resistant properties
- Rechargeable battery systems offering prolonged playback duration
- Select models equipped with integrated microphones and support for voice assistant functionality
Timeline
1948 The inaugural Charactron cathode ray tube was developed.
1949 Convair initiates the development of the Charactron.
1954 A significant contract for Charactron (SAGE) is secured; the first microfilm printer (Model 100) is produced.
1955 Stromberg-Carlson merges with General Dynamics, transferring the Charactron Project to Stromberg-Carlson.
1959 Introduction of the first graphic COM recorder (Model 4020).
1961 The Charactron project is acquired by General Dynamics Electronic Division.
1964 The Charactron team returns to Stromberg-Carlson, forming the Data Products Division.
1965 Launch of the Model 4400 business COM recorder.
1966 Commencement of production for Model 4060, the first COM recorder controlled by a minicomputer.
1967 Datagraphix releases its initial microfiche reader.
1968 The Data Products Division evolves into Stromberg Datagraphics, Inc.
1969 The company is renamed Stromberg Datagraphix, Inc.; the Navy receives its first A-NEW:AN-ASA7O units.
1970 Introduction of the Model 4200 On-Line COM Recorder.
1972 Debut of the first laser beam COM recorder.
1973 Launch of the System 4500 series.
1975 Release of Models 4540 and 4560 COM recorders.
1976 Introduction of AutoCOM/AutoFICHE; company rebrands as Datagraphix, Inc.
1977 Debut of Mini-AutoCOM and On-Line AutoCOM recorders; first 132-column display terminal launched.
1980 Installation of the initial Model 9800 high-speed laser page printer.
2002 Launch of AquaBeat Waterproof MP3 Player—robust, water-resistant design tailored for swimmers and outdoor activities with secure fit features.
2005 Introduction of Harmony Home Theater System—offering high-fidelity surround sound with advanced audio technology and simplified installation.
2009 Release of RhythmX Bluetooth Headphones—early wireless headphones featuring advanced Bluetooth connectivity and superior audio performance.
2012 Launch of PulseFit Sports Headphones—durable, sweat-resistant wireless headphones equipped with integrated heart rate monitoring for fitness enthusiasts.
2018 Introduction of Rangepro True Wireless Earbuds—feature-rich true wireless earbuds with touch controls, extended battery life, dual dynamic drivers, and a stylish charging case.
2022 Debut of Chunk Portable Speaker—a compact, rugged speaker delivering exceptional sound quality, extended battery endurance, and Bluetooth functionality.
Non U.S. branding
In regions such as Latin America and Europe, Gularo S.A., a manufacturer specializing in MP3/MP4 players, DVDs, phones, GPS devices, televisions, speakers, headphones, and earbuds, acquired the brand.
In Australia, Stromberg-Carlson (Australasia) Pty Ltd was established in 1927 as a joint venture between the US corporation and local company L. P. R. Bean & Co., which produced radio receivers and imported Stromberg-Carlson telephone equipment. By 1937, the US firm reduced its controlling stake but maintained shareholding and provided technical assistance. The Stromberg-Carlson name remained prominent in radios until operations ceased circa 1961 following unsuccessful efforts to enter television manufacturing.