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History of the manufacturer  

Clapp-Eastham Co.; Cambridge, MA

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

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 -
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  12–15 Blitzen Rotary Variable Condenser [1912 version]    
USA  23 Radak A23   RF amplifier and Det.(Audion). Needs Tuner with reaction (Radak R23 or similar). 
USA  24 Radak RHM (RH Macy) [.]   actually sold for $69.75. 
USA  23 Radak A4 [.]   more than one box matching amp. for the A4, to drive a horn speaker. 
USA  23 Radak C23 UV201A  Three dials: OSC. CONTROL, ANT. IND., and R.F. CONTROL all used for tuning. Three rheos... 
USA  23 Radak C3   Three dials (primary tuning control knobs) 
USA  23 Radak C64 [.]   Three dials (primary tuning control knobs). "The set iscomplete, containing as it does a b... 
USA  23 Radak C63 [.]   Three dials (primary tuning control knobs) 
USA  25 Radak DD [.] UV201A  Two dials (primary tuning control knobs) 
USA  27/28 Baby Emerson Loud Speaker Set [.] Multivalve  The Baby Emerson Loud Speaker Set uses the "Emerson Multivalve", a triple triode with a co... 
USA  24/25 Radak Gold Seal   Two dials (primary tuning control knobs) 
USA  22 Radak HZ   Matches HR; oak box (mahogany version 40.-USD); 


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