Yamaha

CR-640/U

Receiver

Main Details
Maker Yamaha Brand Nippon Gakki Co. Ltd. Company
Function
Channels/Tracks
  • 2 × Channel
Form Factor Standard Width
Signal Path Analog Hardware
Made In Japan
Date Produced 1979
Dimensions
(H × W × D)
Weight 27.8lbs
Power Source 120VAC, 60Hz 260W
Frequency Response 20Hz-20kHz ±0.3dB
Notes US market specific model. Power supply, back panel and case differs between variants.
Additional Specifications
Output Power (20Hz-20kHz, 0.02% THD, 8/4Ω) 40/45W
Output Power (1kHz, 8/4Ω) 45/55W
Power Bandwidth (IHF) 10Hz-40kHz
Damping Factor (1kHz, 8Ω) 40
THD 0.02%
Input Sensitivity (Phono) 2.5mV
Input Level (Phono, 1kHz, Max) 140mV
Input Impedance (Phono) 47kΩ
Input Level (Aux) 120mV
Input Impedance (Aux) 40kΩ
Input Level (Tape) 120mV
Input Impedance (Tape) 40kΩ
Output Level (Rec. Out, Phono) 120mV
Output Impedance (Rec. Out, Phono) 220Ω
Output Level (Rec. Out, Tuner) 120mV
Output Impedance (Rec. Out, Tuner) 5kΩ
Frequency Response (Phono, RIAA Deviation) ±0.4dB
Frequency Response (Aux) 20Hz-20kHz ±0.3dB
Frequency Response (Tape) 20Hz-20kHz ±0.3dB
SNR (Phono, IHF-A Network) 94dB
SNR (Phono, Aux, IHF-A Network) 100dB
SNR (Phono, Tape, IHF-A Network) 100dB
Residual Noise 0.15mV
THD (Phono, 20Hz-20kHz) 0.02%
THD (Aux, 20W) 0.01%
THD (Tape, 20W) 0.01%
Noise Distortion Clearance Range (NDCR, Phono, 10mW-40W, 8Ω, 1kHz) 0.1
Tuning Range (FM) 87.6MHz-108MHz
Usable Sensitivity (FM, 98MHz, 300Ω) 1.6µV 9.3dBf
Usable Sensitivity (FM, 98MHz, 75Ω) 0.8µV 9.3dBf
Sensitivity (FM, 50dB Quieting, Mono) 3.2µV 15.3dBf
Sensitivity (FM, 50dB Quieting, Stereo) 40µV 36.1dBf
Sensitivity (FM, 50dB Quieting, Auto) 25µV 33.2dBf
Image Response Ratio (FM, 98MHz) 50dB
IF Response Ratio (FM, 98MHz) 80dB
Spurious Response Ratio (FM, 98MHz) 80dB
AM Suppression Ratio (IHF) 60dB
Capture Ratio (Local) 1.5dB
Capture Ratio (DX) 2.5dB
Alternate Channel Selectivity (FM, IHF, Local) 48dB
Alternate Channel Selectivity (FM, IHF, DX) 82dB
SNR (FM, IHF, 65dBf, Mono) 84dB
SNR (FM, IHF, 65dBf, Stereo) 80dB
THD (FM, Mono, 65dBf, 100Hz) 0.1%
THD (FM, Mono, 65dBf, 1kHz) 0.08%
THD (FM, Mono, 65dBf, 6kHz) 0.15%
THD (FM, Stereo, 65dBf, 100Hz) 0.1%
THD (FM, Stereo, 65dBf, 1kHz) 0.1%
THD (FM, Stereo, 65dBf, 6kHz) 0.2%
Intermodulation Distortion (FM, IHF, Mono) 0.08%
Intermodulation Distortion (FM, IHF, Stereo) 0.08%
Subcarrier Product Ratio 60dB
Stereo Separation (FM, 50Hz) 45dB
Stereo Separation (FM, 1kHz) 50dB
Stereo Separation (FM, 10kHz) 45dB
Stereo Separation (FM, Blend) 10dB
Frequency Response (FM, 50Hz-10kHz) ±0.4dB
Frequency Response (FM, 30Hz-15kHz) +0.4/-1.0dB
Auto DX Sensitivity (50dB Quieting) 40µV 36.1dBf
Tuning Range (AM) 525kHz-1605kHz
Usable Sensitivity (AM, IHF) 15µV
Selectivity (AM, 1kHz) 30dB
SNR (AM, 80dB/m) 50dB
Image Response Ratio (AM, 1kHz) 35dB
IF Response Ratio (AM, 1kHz) 40dB
Spurious Response Ratio (AM, 1kHz) 40dB
THD (AM) 0.4%
Output Level (FM, 100% Modulation) 450mV
Output Impedance (FM, 100% Modulation) 3.9kΩ
Output Level (AM, 30% Modulation) 150mV
Output Impedance (AM, 30% Modulation) 3.9kΩ
MSRP (1979) $395

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