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ID = 67129
United States of America (USA)
Developer: Emerson Radval Co.; New York City 
Tube type:  Triple Triode   Text 
  Ca. 1925 up to 1945 rare.
Identical to 4613_WLS
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general Side contacts
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Series, DC

Page 671 of the Fall issue of the Sears Roebuck catalog lists this tube as a "Multivalve" tube and it was made by the Emerson Radval Corp, 25 West 43rd St, New York. The type number of the tube is EM3VA. This company had very close ties with the Cleartron Vacuum Tube Co of 28, 44th St, New York and it is understood that they had interconnecting doors (or a yard) at the rear of each building). According to Tynes' "Saga of the vacuum Tube", Emerson literature for this tube was printed by Cleartron. As was typical with Cleartron tubes, the tip of the "Multivalve" has been flattened at the top, during manufacture.The tube is a triple triode with the second and third plate and grid connections from two sets of binding posts mounted on a bakelite disc attached to the top of the UX base. The tube is also listed in the Spring 1929 catalog.

Dimensions (WHD)
incl. pins / tip
x 120 x 53 mm / x 4.72 x 2.09 inch
Weight 66 g / 2.33 oz
Literature Tube Lore (I)   page 16.
Sears, Roebuck Catalogs (Silvertone)   Page 671, Fall 1928 catalog
-- Collector info (Sammler)

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