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History of the manufacturer  

Emerson Radval Co.; New York City

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Name: Emerson Radval Co.; New York City    (USA)  
Abbreviation: eme
Products: Tube manufacturer
Summary:

Emerson Radval Corporation, 25 West 43rd Street, New York City, NY - which should not be confused with the Emerson Radio & Phonograph Company - designed and marketed the "Emerson Multivalve", also called just "Multivalve" or "Three-in-one". The actual manufacturer was Cleartron Vacuum Tube Co., 28 West 44th Street - near the back door of Emerson Radval ...

History:
In an ad in Radio News from March 1927 theEmerson Radval Corporation quoted from the "New York Herald Tribune" of December 19th 1926: "The new MULTI VALVE may well revolutionize the manufacture and use of Radio Apparatus." They also described the special tube at other places as "a seven-element tube with 201A filament, three plates and three grids."


Some models:
Country Year Name 1st Tube Notes
USA  99 Dublette zu ID = 109661   Ingraham design.    

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

From "The Radio Dealer", front page ad, March 1927, Vol. 10, No. 6.tbn_emerson_radval_multivalve_ad.jpg
Radio News November 1925tbn_emerson_multivalve.png
Emerson Multivalve advert Radio Engineering September 1927tbn_emerson_multivalve_re_927.png

  
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