Natural Sound Stereo Receiver CR-840

• Country
• Japan

• Manufacturer / Brand
• Yamaha Co.; Hamamatsu

• Year
• 1979 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 158068

• • alternative name: Nippon Gakki

• Picture
• Schematics

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

• Number of Transistors
• 47

• Semiconductors

• Main principle
• Superheterodyne (common)

• Wave bands
• FM Broadcast Band Only

• Power type and voltage
• Alternating Current supply (AC) / 120 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 130 W (undistorted)

• Material
• Metal case

• from Radiomuseum.org
• Model: Natural Sound Stereo Receiver CR-840 - Yamaha Co.; Hamamatsu

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 510 x 167 x 386 mm / 20.1 x 6.6 x 15.2 inch

• Notes

• Yamaha Natural Sound Stereo AM/FM Receiver Model CR-840.
  Tuning range:
  FM, 87,6 - 108 MHz
  MW 525 - 1605 kHz
  Power output:
  60 watts per channel into 8Ω (stereo) (20-20000Hz)
  65 watts per channel into 4Ω (stereo) (20-20000Hz)
  Frequency response: 20Hz to 20kHz
  Total harmonic distortion: 0.02%
  Damping factor: 40
  Input sensitivity: 2.5mV (MM), 120mV (line)
  Signal to noise ratio: 94dB (MM), 100dB (line)
  Output: 120mV (line)
  Tone Controls:
  Bass Turnover 350Hz, Bass Boost/Cut +/-10dB at 50 Hz
  Presence Center Frequency 3000 Hz, Presence Boost/Cut +/-6dB
  Treble Turnover 3500Hz, Treble Boost/Cut +/-10dB at 20000Hz
  Low Filter 25 Hz (12dB/Oct.)
  High Filter 8000Hz (6dB/Oct.)
  Loudness Control: Level-related equalization
  Speaker load impedance: 4Ω to 16Ω
  AC Outlets:
  1x Switched - 120VAC 60Hz max. 200 Watts
  2x Unswitched - 120VAC 60Hz max. 200 Watts Total
  Power Consumption: 340 Watts;  (Canadian 510 VA)
  
  Semiconductors:
  47x Transistors, 9x IC's, 1x FET, 14x Diodes, 3x Zener Diodes, 7x LED's, 5x Ceramic Filters

• Net weight (2.2 lb = 1 kg)
• 13.6 kg / 29 lb 15.3 oz (29.956 lb)

• Source of data
• -- Original prospect or advert

• Mentioned in
• - - Manufacturers Literature (Service Manual & Owners Manual)

• Author
• Model page created by Franz Scharner. See "Data change" for further contributors.

• Other Models

• Here you find 767 models, 734 with images and 380 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Yamaha Co.; Hamamatsu