Please click your language flag. Bitte Sprachflagge klicken.

History of the manufacturer  

General Radio Company; Cambridge (MA)

As a member you can upload pictures (but not single models please) and add text.
Both will display your name after an officer has activated your content, and will be displayed under «Further details ...» plus the text also in the forum.
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  68 Power Supply 1262-B   Bolts on to end of the Sound-Level Meter 1551C. Not intended to be added or removed in nor... 
USA  62 Unit Power Supply 1203-B 6X4  General Radio model 1203B power supply. Outputs are 6.3Vac @ 3 A and 300 Vdc @ 50mA. 
USA  56 Precision Capacitor 722MEQ   From General Radio Catalog O, pg. 151-152 (1956): Type 722ME is direct reading in capac... 
USA  12 Variable Air Condenser 246L    
USA  10 Variocoupler   Experimentation module. Module d'expérimentation. 
USA  64 Megohm Bridge 1644-A 8380  Operating ranges R: 20µΩ - 1TΩ C: ≤1pF - 1F L: 100µH - 100H 
USA  36–38 Vacuum-Tube Voltmeter (Thermionic) 726-A [75] 955  This instrument is listed with picture in the General Radio Co, "Catalog J" from... 
USA  33 Microphone Hummer (oscillator) 572-B   This microphone hummer is a 1KHz oscillator which is similar in principle to microphone dr... 
USA  50 VARIAC V-10M   Variable AC power supply output 0-135 VAC.  Seven terminals inside switch b... 
USA  35 Amateur Band Frequency Meter 558-P   Wavemeter with 5 plug-in coils;  3,5 - 64 MHz. 
USA  70 Variac Autotransformer W5MT3A   Metered Variac with 0-140 VAC 5A output. 
USA  61 Filter 1231-P5   The Genrel Radio Company filter 1231-P5 is an adjustable parallel resonant audio filter... 


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