Gulbransen Company was a musical instrument manufacturer of player pianos and home organs in the United States. It was originally established in 1904 by Axel Gulbransen as Gulbransen Piano Company.
In the history of musical instruments, Gulbransen is notable for several innovations. In its early years, Gulbransen made the first upright piano with a player piano mechanism in the same case. In the 1920s, thousands of player pianos were manufactured by the firm under the Gulbransen and Dickinson name. In the electronic organ era, Gulbransen pioneered several innovations in the production of home electronic organs that became industry standards:
- Use of transistor circuitry
- Built-in Leslie speaker system
- Chime stop and Piano stop
- Automatic rhythm (built-in drum machine)
- Automatic walking bass (bass accompaniment)
In 1957, Gulbransen released first transistorized electric organ "Gulbransen Model B" (Model 1100), although its transistorization was limited to the tone generators, and still vacuum tubes were used for the power amplifier. (later, first fully transistorized organ was built for church by Rodgers Instruments)
Also in the 1960s, Gulbransen released one of the earliest transistorized rhythm machines "Seeburg/Gulbransen Select-A-Rhythm", collaborating with Seeburg Corporation. Note that Seeburg invented fully transistorized rhythm machine in 1964 (patented in 1967).
On the other hand, the owner of Gulbransen has changed several times since the 1950s. Around 1950, it was sold to CBS, then in 1964, merged with Seeburg Corporation, and production was once ceased in 1969. In 1985, Mission Bay Investments acquired the brand and produced Elka organs with Gulbransen name. In 2002 or 2003, QRS Music Technologies acquired the brand and pianos were made by Samick.
- James Grebe (2011). "The Gulbransen Piano Company". Yesterday Once More Publications.
- "The Gulbransen Organ". TheatreOrgans.com. May 2006. — including 1957 broaches of "Gulbransen Model B organ".
- "Rare Early Seeburg Rhythm Prince Synthesizer Drum Synth". MatrixSynt. May 13, 2009.
- "Select-a-Rhythm Vintage Drum Machine". EricArcher.net.
- Seeburg Portable Select-A-Rhythm Service Manual. Seeburg Sales Corporation. — rhythm patterns were fully electronically generated by 48-step binary counter using 6-stage flip-flops
- US patent 3,358,068, Richard H. Campbell, Jr., Gilford, N.H. (Seeburg Corporation), "Musical Instruments", issued 1967-12-12
— related patents filed at the same time were: Automatic Rhythm Device, Automatic Repetitive Rhythm Instrument Timing Circuitry, and sound circuits of Snare Drum Instrument and Cow Bell Instrument.
- "QRS acquires Gulbransen: plans new types of reproducing technologies. (Industry Forefront)", Music Trades (March 1, 2003), "QRS MUSIC TECHNOLOGIES, Inc., has acquired Gulbransen, Inc., ..."
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