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History of the manufacturer  

Gulbransen Co.; Chicago

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Name: Gulbransen Co.; Chicago    (USA)  
Abbreviation: gulbransen
Products: Model types Brand

Gulbransen Company; 816 North Kedzie Avenue, Chicago, Illinois - Trade names Champion Jr., Gulbransen. According to "The Music Trade Review", September 15, 1928, Gulbransen Company was at 3232 W. Chicago Ave., Chicago. They claimed then to have 1500 radio dealers in an advertisement and state: "In the piano business, Gulbransen has attained leadership that all recognize." Then they sold radios also with franchising outlets - only AC table and console models.
One has to distinguish between Gulbransen in Australia and in the USA.
Gulbransen exportet - for instance to Switzerland.

Tubes with the Gulbransen name made for the company. Manufacturer not known.

The Gulbransen Company began operation in 1904 producing pianos and reed organs. In 1930 Gulbransen aquired the radio manufacturer Wells-Gardner but kept the name as a division of Gulbransen. In July 1957, Gulbransen introduced its first electronic organ - designed by Richard H. Peterson. This was the Model B (Model 1100), a spinet that was the first transistor organ in the industry. Then they produced in 2050 North Ruby Street, Melrose Park, Illinois. Gulbransen eventually merged with Seeburg, and then the entire operation was absorbed by C.B.S. Gulbransen is now a division of Mission Bay Investments producing Elka organs with the Gulbransen name.

Some models:
Country Year Name 1st Tube Notes
USA  32 135 35   
USA  31/32 235 35  Push-pull af output stage. 
USA  31 10 35   
USA  31 13 35  Different power transformers for 110 V (25 cycle), 110 V (40-60 cycle) or 220 V (40-60 cyc... 
USA  31/32 20 early or late 35  Push-pull af output stage. 
USA  31/32 23 35  Push-pull AF output stage; different power transformers are used for 110 V (25 cycle), 110... 
USA  32 130 35  Wood with repwood grille.  
USA  33 05A 77   
USA  33 06W 78  Push-pull af output stage; synchr. vibrator for +B. 
USA  32 135 [(new)] 51  Late model 
USA  31 135 [(old)] 35  Early model 
USA  30 160 24  Different power transformers and filter systems for 25 or 60 cycle operation; push-pull af... 


Further details for this manufacturer by the members (rmfiorg):

I had found this advertisement long ago and can't remember from where, sorry.tbn_gulbransen_ad_1931.jpg