• Country
• People's Republic of China

• Manufacturer / Brand
• Nanjing 南京工学院无线电厂 Nanjing Engineering Faculty Radio Factory; Nanjing

• Year
• 1966 ??

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 175395

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• 3

• Semiconductors
• 3AG51 3AG51 3AX71 2AP9 2AP1_Diode 2AP1_Diode

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz; 2 AF stage(s); Reflex

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 4.5 Volt

• Loudspeaker
• Permanent or electro-dynamic (moving coil), system not known yet.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: 5.7 The 7th of May 301 - Nanjing 南京工学院无线电厂

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 175 x 103 x 44 mm / 6.9 x 4.1 x 1.7 inch

• Notes
• The brand of this radio is 5.7 which corresponds to "The 7th of May". Jingtiguan Shouyinji is written on the set, which means "Transistor Radio".Mandarin jīng​tǐ​guǎn or simplified Chinese: 晶体管 for "Transistor" and Mandarin shōu​yīn​jī​ or simplified Chinese 收音机 for "Radio". The same term can be written as Ban Dao Ti Shou Yin Ji or 半导体收音机 on other models.

• Literature/Schematics (1)
• 01-Transistor Radio Manual 1972, 2nd Ed. 2nd Print 1983 (page 10.)

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

• Other Models

• Here you find 2 models, 2 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Nanjing 南京工学院无线电厂 Nanjing Engineering Faculty Radio Factory; Nanjing