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History of the manufacturer  

Electrical Research Laboratories Inc. (Erla); Chicago, Illinois

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Name: Electrical Research Laboratories Inc. (Erla); Chicago, Illinois    (USA)  
Abbreviation: erla
Products: Model types Tube manufacturer
Summary:

Erla = Electrical Reserach Labs; 2500 Cottage Grove Avenue, Chicago, Illinois - see also Sentinel Radio.
Trade names Erla, Pearson, Ramway, Sentinel, Sky Rover, Tone Master.

Generalvertretung Schweiz: J. Jäger, Radios en gros; Zürich - aber Genf = Arslanian.

History:

ERLA has not to be confused with Electrical Research Products Inc. which was connected to Radio Wire Television Inc. formerly Wholesale Radio Service Co. Inc. New York, Chicago, Atlanta, Boston, Newark, Bronx NY, Jamaica LI for the brand Lafayette.


Some models:
Country Year Name 1st Tube Notes
USA  31/32 50-P 47  [3331455B] 
USA  31/32 81 Ch= 245 24A  Phono input; push-pull af output stage. 
USA  31/32 81-P Ch= 248 35  [3331444-1328] 
USA  31/32 21-P 35  [3331444-1328B] 
USA  31/32 61-P 35  [3331444-1328] 
USA  29 noname?   One dial (primary tuning control knob) 
USA  31 Short Wave Converter [Console?]   SW-Converter. Radio collectors Guide 1921-1932 notes a console. That is unlikely for a con... 
USA  30 224-B 24  Phono input; push-pull af output stage. 
USA  30 225 24  4-gang condenser; phono input; push-pull af output stage. 
USA  31 22-P 35   
USA  31 271 24  4-gang condenser. 
USA  30 271-A UY224  Cathedral with squared top; 4-gang condenser. 

[rmxhdet-en]

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

Firmen-Logo: Erla USA um 1929tbn_usa_erla_1929_firmenlogo.jpg
By courtesy of Gerhard Buck, DJ3YR. Picture from the US journal "Electronics", 1942.tbn_us_army_bc611_walkie_talkie_in_electronics_1942_1.png
Radio Broadcast, Feb. 1925, p.848jtbn_usa_erla_superflex.jpg
Radio Broadcast, Sep. 1925, p. 671tbn_usa_erla.jpg
Citizens Radio Call Book, May 1924, p. 148tbn_usa_erla_123t.jpg
Thanks for Mr.Szécsényi Lajos, Hungary, Pocsaj and Első Zalai Rádiómúzeum Alapítvány, First Zala County Radio Museum Foundation.tbn_usa_erla_ballooncircloid_brandname.jpg
Tube leaflet part 1tbn_erla1.png
Tube leaflet part 2tbn_erla2.png
Tube leaflet part 3tbn_erla3.png

  
rmXorg