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History of the manufacturer  

Zhengzhou 郑州无线电厂 Zhengzhou Radio Factory; Zhengzhou

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Name: Zhengzhou 郑州无线电厂 Zhengzhou Radio Factory; Zhengzhou    (PRC)  
Abbreviation: zhengzhou
Products: Model types
Summary:

Zhengzhou Radio Factory; Zhengzhou 郑州无线电厂: Brands: Huanghe 黄河 and Erqi 二,七.

History:

Zhengzhou Radio Factory; Zhengzhou 郑州无线电厂:

Zhengzhou 郑州, Mandarin Zhèng​zhōu, is a ​prefecture level city and capital of Henan Province (河南省) in central China, trad. Chinese 鄭州.

Brands:
Huanghe 黄河 Mandarin Huáng​hé (Yellow River) or Huang He 黃河i.
Erqi 二,七 (2.7 - February 7).


Some models:
Country Year Name 1st Tube Notes
PRC  66 Huanghe 黄河 J5-S1 3AG11   
PRC  66 Erqi 2.7 二,七 501 3AG11   
PRC  60 Huanghe 黄河 562 6SA7GT  The model Huanghe 黄河 562 (Yellow River) receives the broadcast band 550 - 16... 
PRC  60 Huanghe 黄河 563 6SA7GT  The model Huanghe 黄河 563 (Yellow River) receives the broadcast band 550 - 16... 
PRC  60 Huanghe 黄河 SY-1 6SA7GT  The model Huanghe 黄河 SY-1 (Yellow River) receives the broadcast band 550 - 1... 
PRC  66 Huanghe 黄河 5J1 3AG11   
PRC  68 Huanghe 黄河 741A 3AG21  The radio model Huanghe 黄河 741A (Yellow River) has the following key feature... 
PRC  68 Huanghe 黄河 741 3AG21  The radio model Huanghe 黄河 741 (Yellow River) has the following key features... 

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