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History of the manufacturer  

Clapp-Eastham Co.; Cambridge, MA

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Name: Clapp-Eastham Co.; Cambridge, MA    (USA)  
Brand:
Radak
Abbreviation: clapp-east
Products: Model types
Summary:

Clapp-Eastham Company, 136 Main Street, Cambridge, Massachusetts was founded 1908 to manufacture C-ray equipment and wireless sets (from 1912). Clapp-Eastham moved to Brooklyn, NY about mid 1925. The company went out of business in 1929.

Founded: 1908
Closed: 1929
Production: 1912 -
History:
Clapp-Eastham Co.; 136 Mainstreet, Cambridge, Massachusetts - Trade name Radak. Clapp-Eastham made quite early sets like the Blitzen Receiver, Blitzen Tuner or D Receiver and D Tuner. Still during First World War they made also a Loose Coupler Navy Type and the Blitzen Short Wave Tuner, followed by their Radak receivers for Broadcasting, beginning 1922.

Probably the latest model was teh "Baby Emerson Loud Speaker Set" with the Mulivalve, as did Standard with its "Standardyne Multivalve Radio".


Some models:
Country Year Name 1st Tube Notes
USA  14–16 1/2 K. W. High Potential Condenser Cat. No. W655    
USA  22 National Radak Junior UV201A  Manufactured for the National Cloak & Suit Company by Clapp-Eastham. This set was iden... 
USA  10–20 Blitzen Transformer Type E   The secondary potentials of the Type E transformers are as follows: 1/4 K. W., appor... 
USA  10 Receiving Set No. 14   It consists of a Receiving Transformer (loose coupler), two Ferron Detectors, Tubular Cond... 
USA  10 Receiving Set No. 16   It consists of a Receiving Transformer (loose coupler), two Ferron Detectors, Tubular Cond... 
USA  10 Ceco Tuning Coil   Tuning coil will respond up to 1,500 meters. 
USA  10 Wireless Telegraph Apparatus Catalog G   1910 Clapp-Eastham Company Wireless Telegraph Apparatus Catalog G  
USA  09 Adjustable Spark Gap    
USA  09 Transmitting Set Type A.C.C. [1/4 K.W.]   Clapp-Eastham Co. Wireless Apparatus Type A.C.C. Spark Transmitter 1/4 K.W. mounted in a m... 
USA  10 Crystal Receiving Set No. 6040   Manufactured by the Clapp-Eastham Company for the J. J. Duck Company.  Dual Ferron... 
USA  12–15 Blitzen Receiving Set   Clapp-Eastham Blitzen Receiving Set. Introduced April 1912 and last adver... 
USA  09–14 Crystal Receiving Set   Manufactured by the Clapp-Eastham Company for the J. J. Duck Company.  

[rmxhdet-en]

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

June 1922 Radio Broadcast magazinetbn_usa_clappeastham_ad_june22radiobroadcast.jpg
July 1919 Electrical Experimenter magazine advertisement page 270 This advertisement mentions Bulletin Y which would then date the undated Clapp-Eastham Bulletin Y to 1919tbn_usa_clappeastham_800_cond_july1919electexper_pg270.jpg
June 1924 Radio News magazine advertisement page 1835tbn_usa_clappeastham_june_1924_radio_news_page_1835.jpg

  
rmXorg