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History of the manufacturer  

Tri-City Radio Supply Co. (Tresco); Davenport, Iowa

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Name: Tri-City Radio Supply Co. (Tresco); Davenport, Iowa    (USA)  
Abbreviation: tri-city
Products: Model types

Tri-City refers to the three cities of Davenport, Iowa, and Rock Island and Moline, Illinois; the company later had a connection with Clinton, Iowa which was not far away. It was started by a couple of radio amateurs who liked to design and build radio equipment and started selling it to other amateurs. the name "Tri-City Radio Laboratory" first appeared in print in June 1916 although it was later claimed to have dated from 1914. The address was a ham station 9XR of Robert Karlowa in the Best Building in Rock Island. His partner was probably William Kirwan of Davenport, 9XE.

In the November 1925 edition of The Radio Trade Directory on page 120, under the listing for manufacturers of crystal sets the Tri-City Electric company was still listed as a manufacturer. Trade Names: TRESCO, Trescola, Simple Simon


After WWI Tri-City began advertising a series of small tuner boxes and some complete receivers. After December 1919 the ads are signed "Tresco Sales Agency, Davenport" while the flyers give Clinton, Iowa as the location of the "Perfection Radio Laboratory" or later the "Manufacturing Department".
In mid to late 1925 Steinite Radio acquired the remnants of Tri-City Radio Electric Supply (Tresco). The operation was then taken over by Steinite Radio Co.

Some models:
Country Year Name 1st Tube Notes
USA  22 Tresco Super Universal [DeLuxe]   Wave range 150 - 25000 m. There is a plain version too. 
USA  25 Trescola 1   Two dials (primary tuning control knobs) 
USA  25 Trescola 2    
USA  25 Trescola 3 UV200  Two dials (primary tuning control knobs) The Trescola 3 was very similar to the 3-t... 
USA  25 Trescola 4   Two dials (primary tuning control knobs). 
USA  25 Trescola 5   Only in, no further evidence yet. 
USA  24 37$   Found only in reference. No other evidence yet or details. Two dials (primary tuning co... 
USA  23 72$   Found only in reference. No other evidence yet or details. Two dials (primary tuning cont... 
USA  24 Reg Tuner   An ad says: "500 to 1000 mile Regenerative Tuner. This set is portable and uses any type o... 
USA  24 Tresco Simple Simon SS [w/o amp]   Also with one step amplifier. 
USA  24 Tresco SS1 Simple Simon [with amp.]    
USA  23 SU   Found only in reference. No other evidence yet or details. 


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

March 1922 QST magazinetbn_usa_tricity_superuniver_ad_mar22qst180k.jpg
December 1921 The Wireless Age magazinetbn_usa_tricity_cw_ad_dec21wirelessage180k.jpg
June 1922 Radio News magazine page 918tbn_usa_tricity_ad_june21radnews.jpg
Radio News for August 1922tbn_us_tresco_advert-1922.jpg
July 1924 Radio News magazine advertisement page 1778tbn_usa_tresco_ad_july.1924_radio_news_page_1778.jpg
June 1916, The Electrical Experimenter magazine page 122tbn_usa_tri_city_june_1916_electrical_experimenter_122.jpg