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History of the manufacturer  

Pacific Radio Exchange; San Francisco, CA

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Name: Pacific Radio Exchange; San Francisco, CA    (USA)  
Abbreviation: pacif-raex
Summary:

The Pacific Radio Exchange was located at 439 Call Building in San Francisco, California. In a November 1922 Radio magazine advertisement they offered a line of individual box sets that could be strung together to form a complete radio.

History:
Pacific Radio Exchange;


Some models:
Country Year Name 1st Tube Notes
USA  20 Paradex Compass Coil    
USA  22 Paradex Detector   Pacific Radio Exchange offered a line of little "box" sets that could be strung together t... 
USA  22 Paradex Tuner   Pacific Radio Exchange offered a line of little "box" sets that could be strung together t... 
USA  22 Paradex Radio Frequency Amplifier UV201  Pacific Radio Exchange offered a line of little "box" sets that could be strung together t... 
USA  22 Paradex Audio Frequency Amplifier UV201  Pacific Radio Exchange offered a line of little "box" sets that could be strung together t... 
USA  34 Spero Four 58   
USA  34 Spero Super 58  Push-pull af output stage. 

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