Hongdeng 红灯 784 - 10 Transistor 2 Band

Shanghai No.2 上海无线电二厂 Shanghai No.2 Radio Factory; Shanghai

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  • Year
  • 1974 ??
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 179341

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

 Technical Specifications

  • Number of Transistors
  • 10
  • Main principle
  • Superheterodyne (common); ZF/IF 465 kHz
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Alternating Current supply (AC) / 220 Volt
  • Loudspeaker
  • - This model requires external speaker(s). / Ø 6.5 inch = 16.5 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Hongdeng 红灯 784 - 10 Transistor 2 Band - Shanghai No.2 上海无线电二厂
  • Shape
  • Tablemodel, low profile (big size).
  • Notes
  • The radio model Hongdeng 红灯 784 (Red Lantern - Hongdeng is written on the model) receives broadcast band 525 - 1605 kHz and SW 3.9 - 12 MHz. Hongdeng/Red Lantern 784 has a sensitivity 灵敏度 of: < 1 mV/m (150uV) or 0.8 mV/m resp. 100uV (manual 03). Selectivity 选择性: > 20 dB S/N (24 at manual 03). Set audio output 额定功率: 4 W. The IF 中频频率 is most probably 465 kc. Zener-diode 2CW1? (?) and rectifier QL-1A-50V. 8 ohm loudspeaker. 9 Transistors for receiving, one (3AX81B) for the power unit. Some transistors differ in the suffix between the catalogs 16 and 03. There are 4 diodes plus 4 for the power unit.
  • Author
  • Model page created by Ernst Erb. See "Data change" for further contributors.

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