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History of the manufacturer  

QRS Music Company; Chicago, IL

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Name: QRS Music Company; Chicago, IL    (USA)  
Abbreviation: qrs-music
Products: Tube manufacturer

The Q.R.S. Music Company
306 So. Wabash Ave, Chicago, Ill.
75 East Jackson Boulevard, Chicago

Brand Name of tubes: QRS Red-Top.

Production: 1925 - 1928
In 1925 A-P Labs was taken over by the QRS Music Company of Chicago. QRS Tube Division was taken over by Raytheon in 1928. This followed a law suit brought by Raytheon against QRS for patent infringement, settled in May 1928.

This manufacturer was suggested by Otmar Jung.


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

Later Majestic rectifiers were made by QRS, before QRS lost a patent suit to Raytheontbn_usa_majestic_bh_1.jpg
QRS tube displaytbn_usa_qrs_tubes.jpg
QRS red top brochure 1925tbn_qrs_red_top_brochure_1925.png
QRS Radio Engineering October 1927tbn_qrs_advert_radio_engineering_october_1927.png
QRS tube brochure c. 1925 page 1tbn_qrs_tube_brochure_c._1925_1.jpg
QRS tube brochure c. 1925 page 2tbn_qrs_tube_brochure_c._1925_2.jpg
Radio Engineering September 1927tbn_qrs_rectifier_re927.png
"Listener in" Australia April 16th, 1927tbn_qrs_listener_in_16427.png
Unidentified advert c. 1927tbn_qrs_ad_tubes_and_piano_rolls_1927.jpg