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History of the manufacturer  

Howard Radio Company; Chicago, IL

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Name: Howard Radio Company; Chicago, IL    (USA)  
Brand:
Green-Diamond || World Seven
Abbreviation: howard
Products: Model types Brand
Summary:

Howard Radio Company
451-469 East Ohio St., Chicago, IL
431 South Dearborn St., Chicago, IL (1936)
1731-1735 Belmont Ave., Chicago, IL (1937, 1945)

Trade names included Howard, Cable-Nelson, Green Diamond, and World Seven.

Tubes with the Howard brand were made, but a timeline is not known.
Production: 1923 - 1948
History:

The primary product for Howard Radio Company were broadcasting receivers. Howard was also quite well known for it's models for short wave listening, radio amateurs and military. Those models were good looking but never considered as "good".  During WWII, under a 1942 military contract, Howard manufactured the BC-779 version of the Super Pro SP-200 series for Hammarlund.

The Howard Radio Company held a license from RCA and made the electronics for the big Capeharts until Farnsworth bought the company. Howard has also built communication receivers for Sears (Silvertone) and Hallicrafters. They exported, for instance to Switzerland.

Some models:
Country Year Name 1st Tube Notes
USA  31 35A Ch= AVO 35    
USA  31 EX 27  Separate Oscillator and 1st Det. each for BC and for LW. Phono input. 
USA  39 1    
USA  31 10 35   
USA  37 118 6K7  BC (550 - 1700 kHz), TROP (1700 - 5500 kHz) and SW (5.5 - 18.0 MHz) bands. RF stage for BC... 
USA  39 12-B 1A7G   
USA  28 135-B 135 [Desk] UX201A  One dial (primary tuning control knob) 
USA  28 135-B 135 [C] UX201A  One dial (primary tuning control knob) 
USA  27 135-AC   Chassis for models 395, 445, 470 and 495. For details see these models 
USA  40 14ABC    
USA  40 14-ACB 1P5GT   
USA  37 1626    
[rmxhdet-en]

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

Scanned from the Radio Retailing March 1937.tbn_howard_prom_rr_mar37_p32.jpg
Scanned from the Radio Retailing August 1937.tbn_howard_prom_p3_aug37.jpg
Scanned from the Radio Retailing October 1937.tbn_howard_prom_rr_oct37.jpg
Scanned from the Radio Retailing January 1942.tbn_howard_prom_jan42_p53.jpg
Scanned from the Radio Retailing October 1941 page 30.tbn_howard_prom_rr_oct41_p30.jpg
Scanned from the Radio Retailing October 1945 page 25.tbn_howard_prom_rr_oct45_p25.jpg
Scanned from the Radio Retailing January 1946 page 115.tbn_howard_prom_rr_jan46_p115.jpg
Scanned from the Radio Retailing March 1946 page 121.tbn_howard_prom_rr_mar46_p121.jpg
Scanned from the Radio Retailing April 1946 page 105.tbn_howard_prom_rr_apr46_p105.jpg
Scanned from the Radio Retailing May 1946 page 131.tbn_howard_prom_rr_may46_p131.jpg
Scanned from the Radio Retailing June 1946 page 100.tbn_howard_prom_rr_jun46_p100.jpg
Scanned from the Radio Retailing July 1946 page 161.tbn_howard_prom_rr_jul46_p161.jpg
Scanned from the Radio Retailing November 1946 page 140.tbn_rr_nov46_p140.jpg
Scanned from the Radio Retailing January 1947 page 30.tbn_rr_jan47_p30.jpg
Scanned from the Radio & Television Retailing March 1947 page 71.tbn_rr_mar47_p71.jpg
Scanned from the Radio & Television Retailing April 1947 page 126.tbn_rr_apr47_p126.jpg
Scanned from the Radio & Television Retailing July 1947 page 111.tbn_rr_jul47_p111.jpg
  
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