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Songhuajiang 松花江 7404B later factory

Songhuajiang 松花江 7404B; Harbin No.4 哈尔滨无... (ID = 817901) Radio
 
Songhuajiang 松花江 7404B; Harbin No.4 哈尔滨无... (ID = 817902) Radio
Songhuajiang 松花江 7404B; Harbin No.4 哈尔滨无... (ID = 814880) Radio
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Songhuajiang 松花江 7404B; Harbin No.4 哈尔滨无... (ID = 814880) Radio
Harbin No.4 哈尔滨无...: Songhuajiang 松花江 7404B [Radio] ID = 814880 617x577
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For model Songhuajiang 松花江 7404B later factory, Harbin No.4 哈尔滨无线电四厂 Harbin No.4 Radio Factory; Harbin (Heilongjiang, NE):
Picture from the Transistor Radio Circuit Manual August 1981 vol. 1 of 5 (internal 03), page 196 for reference when somebody is uploading real photos and as reference for collectors, comparing models.
 
Country:  People's Republic of China
Manufacturer / Brand:  Harbin No.4 哈尔滨无线电四厂 Harbin No.4 Radio Factory; Harbin (Heilongjiang, NE)
Year: 1972 ?? Category: Broadcast Receiver - or past WW2 Tuner
Semiconductors (the count is only for transistors) 7: 3AG1B 3AG1B 3AG1B 3AX31B 3AX31B 3AX31B 3BX31B 2AP9 2AP9 2AP9 2CK 2CK
Main principle Super-Heterodyne (Super in general); ZF/IF 465 kHz; 3 AF stage(s)
Tuned circuits 5 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Dry Batteries / 6 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Radiomuseum.org Model: Songhuajiang 松花江 7404B [later factory] - Harbin No.4 哈尔滨无线电四厂
Shape Tablemodel, low profile (big size).
Notes The radio model Songhuajiang 松花江 7404B (Songhua River) has the following key features 主要性能: Frequency range 频率范围: broadcast band 535 - 1605 kc. Sensitivity 灵敏度: < 1.5 mV/m. Selectivity 选择性: 20 dB N/S. Set audio output 额定功率: 150 mW. Electric power consumption 电源消耗 at zero signal 零信号: is not given. The IF 中频频率 is most probably 465 kc. Loudspeaker impedance is probably 8 ohm. 5 diodes.

Manual 02 from 1965 lists Model 7404B with manufacturer 哈尔滨无线电厂 Harbin Radio Factory. The later manual 03 lists it together in the same documentation on page 196 with Songhuajiang 松花江 7403, 7404 and 7404B for "Harbin No.4 Radio Factory" 哈尔滨无线电四厂 - where we bring the following history: 哈尔滨新生开关厂 Harbin Xinsheng Kaiguan Factory; Harbin (Heilongjiang, NE) changed the name in 1970 to "Harbin No.4 Radio Factory" 哈尔滨无线电四厂. This can tell us that either this model was made over many years - by at least two companies - or that there is an error in manual 02. We have to keep the model at both factories anyway - otherwise a person will create it - and we all would not be aware of this.
Literature/Schematics (1) 03-Transistor Radio Circuit Manual 1981 August (1 of 5) (page 196.)

Model page created by Ernst Erb. See "Data change" for further contributors.



All listed radios etc. from Harbin No.4 哈尔滨无线电四厂 Harbin No.4 Radio Factory; Harbin (Heilongjiang, NE)
Here you find 3 models, 3 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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