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History of the manufacturer  

Industrial Union Proton; Charkov (Ukraine), see Charkov Radio Works N°158

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Name: Industrial Union Proton; Charkov (Ukraine), see Charkov Radio Works N°158    (SU)  
Abbreviation: indus-u-pr
Products: Model types Others

Secret manufacturer name "Post Box M-5377". Military radio equipment producer. Manufacturer of well-known Russian receivers as R-250M2, R-309, R-720, R-721 and others.
At first named as Charkov Radio Works Nr. 158 (Post Box 165)


This manufacturer was suggested by Zenonas Langaitis.

Some models:
Country Year Name 1st Tube Notes
SU  57–81 Rusalka-M R-670M {Р-670М}   Marine-Bezeichnung für R-250M. Völlig identisch.Separates Netzteil. 
SU  48–81 Rusalka R-670 {Р-670} 6К3  Marine-Bezeichnung für R-250. Völlig identisch. Separate Stromversorgung. 
SU  65–81 R-309 ("P-309") 1Ж29Б  1.0 to 36 MHz (AM/CW) in eight ranges, turret tuner, projection tuning scale, variabe IF b... 
SU  66–81 "Kit M2" R-250M2 {Р-250М2} 6К4П  Successor of R-250M. 1.5-25.5 MHz in 12 ranges (turret tuner), with optional extension kit... 
SU  48–81 Kit - whale R-250M - Р-250М 6К3  1.5-25.5 MHz in 12 ranges (turret tuner), AM/SSB/CW, optical projection tuning scale, moto...