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History of the manufacturer  

Hygrade Lamp Co. (Neptron); Salem, Massachusetts

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Name: Hygrade Lamp Co. (Neptron); Salem, Massachusetts    (USA)  
Abbreviation: hygrade
Products: Tube manufacturer

Hygrade Lamp Co., Salem; Massachusetts.

Hygrade had an own designation system and had a licence of RCA. After a merger in 1931 between Hygrade Lamp Co., Sylvania Products Corp. and Nilco Lamp works, the new company was named Hygrade-Sylvania. In 1932 it established offices at 500 Fifth Avenue, New York. The tube factory had as adress 64 Lekeview avenue, Clifton, N.J.

The "Neptron Corporation in Salem, MA, was at least in November 1928 (Radio Retailing, page 120) a subsidary of the Hygrade Lamp. Co.


This manufacturer was suggested by Peter den Boer.


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

Radio Engineering May 1931tbn_hygrade_re_531.png
Radio Engineering July 1931tbn_hygrade_re_731.png
Radio Engineering - page undatedtbn_hygrade_re_undated.png
Radio Engineering August 1931tbn_hygrade_re831.png
Neptron tube brochure 1925tbn_neptron_brochure_1925.png

Forum contributions about this manufacturer/brand
Hygrade Lamp Co. (Neptron); Salem, Massachusetts
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Hygrade Lamp Co. (Neptron); Salem, Massachusetts
Fin Stewart

The RCA licence referred to was announced in the Wall Street Journal April 8th 1930, in their "Broad Street Gossip" column

Hygrade Lamp Co. (Neptron); Salem, Massachusetts
End of forum contributions about this manufacturer/brand