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History of the manufacturer  

General Radio Company; Cambridge (MA)

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Name: General Radio Company; Cambridge (MA)    (USA)  
alternative name:
Abbreviation: gener-raco
Products: Model types Others

General Radio Company (GenRad), Cambridge, Massachusetts. Founded by Melville Eastham.

First catalog known from 1916 with measurement instruments like Wavemeter etc., they also manufactured radio equipment for the US Corp. in WWI, WWII, Korean War.

Founded: 1915
General Radio Company; THE GENERAL RADIO COMPANY, pioneer manufacturer of electronic instruments, test equipment, and laboratory standards, was established in June 1915. General Radios founder was Melville Eastham, who, until his retirement in 1930, was president and chief engineer over the greater part of the first 33 years of the company's existence. General Radio was started on the sound assumption that measurement, as already proved in other fields of physics, would he the basis of technical progress in electrical communication. In 1915, markets for electronic products were few: wireless telegraph companies, telephone companies, the armed services, and colleges. Of the companies manufacturing instruments for the radio industry in 1913, no other survives today. Through two wars and two major depressions, the General Radio Company has grown steadily over the past 40 years. It is employee-owned and employee-managed. It is an engineers company. Of its nine-member management committee, seven have engineering degrees. With main offices and factory in Cambridge and a branch plant in Concord, Massachusetts, total plant floor area is more than 220,000 square feet. Employment is approximately 600, of which some 30 are engineers engaged in development, design, and application work.
Generalvertretung für Österreich durch Dipl. Ing. P. Marchetti. Elektronische Geräte und Anlagen, Sandwirtgasse 14, 1060 Wien

Die Altersbestimmung von GenRad-Geräten ist oft schwierig, da viele Geräte und insbesondere auch Bauteile über viele Jahre, ja teilweise Jahrzehnte im Programm waren.

(Quelle: Genrad Kataloge von 1946 bis 1961)

Some models:
Country Year Name 1st Tube Notes
USA  26 3 dials   Three dials (primary tuning control knobs) 
USA  26 Hudson Big 6   One dial (primary tuning control knob) 
USA  30 Amplifier 210 26  Amplifier and "B" eliminator; push-pull af output stage. 
USA  30 Amplifier 250 27  Amplifier and "B" eliminator. 
USA  30 Oscillator 320 12A  180 Kc or 600-1400 Kc output frequency. 
USA  30 Test Oscillator 360 UX112A  175, 180 Kc or 550-1500 Kc output frequency. 
USA  30 Oscillator 360-A 112A  175, 180 Kc or 550-1500 Kc output frequency. 
USA  26 Tube Tester 361-B   The schematic shows four different circuits to determine several tube characteristics (amp... 
USA  30 Rectron "B" Eliminator 390 UX213  "B" eliminator.    
USA  30 Modulating Oscillator 403-C unknown_Tube  Internal or external modulation signal; modulating voltage meter. 
USA  26 B Eliminator BH   
USA  31 Decade Resistance Box 602-J   Decade resistance box providing 1 ohm at 800mA to 11,110 ohms at 23 mA in increments of 1 ... 


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

Quelle: Vom Gerättbn_usa_general_radio_logo.png
First page of the journal "The General Radio Experimenter" Volume XXIV No. 1, June 1949. For all (8) pages see model 1932-A.tbn_general_radio_experimenter_june_1949.jpg
Radio Broadcast, Mar. 1924, p. 437tbn_usa_general_radio.jpg
Radio Broadcast, Apr. 1924, p. 527tbn_usa_general_radio_3.jpg
GenRad_Catalog 1946tbn_usa_genrad_catalog_1946.jpg
GenRad_Catalog 1956tbn_usa_genrad_catalog_1956.jpg
GenRad_Catalog 1961tbn_usa_genrad_catalog_1961.jpg
Index of Products by number page 1 of 2 catalog J from September 1936.tbn_general_radio_catalog_j_sept_1936_index_types_1_2.jpg
Index of Products by number page 2 of 2 Catalog J from September 1936.tbn_general_radio_catalog_j_sept_1936_index_types_2_2.jpg