Amplifier JVC MCA-V7

JVC_MCA_V7E.jpg 
 Around early 1970 
 (japanses translation) 
 Commentary 
 4ch Amplifier equipped with a Sound Field Composer. I am equipped with a Sound Field Composer circuit where you can enjoy the atmosphere of 4ch in 2ch source. By a device to reproduce the pseudo 4ch, is output from the speakers of another reverberation only component that is included in the 2ch source, this circuit is aimed to reproduce the sense of reality. 
 It uses a 2ch-4ch complementary circuit by BTL Type of actuation in the MCA-V7, to drive each speaker in the SEPP circuit four sets 4ch playback, I get a high-powered by BTL connection 2ch time. I have adopted a quasi-complementary ITL · OTL circuit to circuit configuration. In addition, with the aim of noise reduction by adopting a low-noise silicon transistor. Equalizer circuit has become a two-stage, and is stopping the transistor noise by using a PNP transistor in the first stage. 4ch and two inputs, it is equipped with the 4ch recording and playback terminal. 
 It is equipped with an pre-out main-in terminal of 4ch, it can be used independently of the main amplifier and preamplifier. 
 
 
 
 
 
 
 
 
 Model 
 
 
 4ch Amplifier 
 
 
 
 
 <Power amplifier section> 
 
 
 
 
 Circuit system 
 
 
 SEPP-OTL circuit, BTL switchable 
 
 
 
 
 Music Power 
 
 
 45W +45 W (8Ω) 
 
 
 
 
 Effective output 
 
 
 12.5W × 4 (8ohms) 28W +28 W (8ohms) 
 
 
 
 
 Harmonic distortion 
 
 
 0.08% (12.5W) 
 
 
 
 
 Intermodulation distortion 
 
 
 0.2% (12.5W) 
 
 
 
 
 Power Band Width 
 
 
 30Hz ~ 50kHz-3dB 
 
 
 
 
 Frequency characteristic 
 
 
 20Hz ~ 100kHz ± 0.5dB 
 
 
 
 
 SN ratio 
 
 
 90dB or more 
 
 
 
 
 Input sensitivity / impedance 
 
 
 0.6V/50kΩ 
 
 
 
 
 Load impedance 
 
 
 8Ω ~ 16Ω 
 
 
 
 
 Damping factor 
 
 
 50 (8Ω) 
 
 
 
 
 <Preamplifier> 
 
 
 
 
 Input sensitivity / impedance 
 
 
 Phono: 3MV/50keiomega Tuner, Aux, Tape play, DIN: 50MV/100keiomega 
 
 
 
 
 Phono maximum permissible input 
 
 
 100mV 
 
 
 
 
 Tone control 
 
 
 4ch tone control, NF type Bass: ± 10 dB (100 Hz) Treble: ± 10 dB (10 kHz) 
 
 
 
 
 Output Impedance 
 
 
 Pre out: 0.5V (nominal), 5V (maximum) / 1.2 kW Rec out: 36MV/4.7Keiomega DIN: 36MV/80keiomega 
 
 
 
 
 Frequency characteristic 
 
 
 Phono: RIAA ± 0.5 within 20Hz ~ 40kHz +0-1.5dB: Aux 
 
 
 
 
 Harmonic distortion 
 
 
 0.1% (1kHz, 2.5V) 
 
 
 
 
 Intermodulation distortion (60Hz: 70kHz = 4:1) 
 
 
 0.2% (2.5V) 
 
 
 
 
 SN ratio (IHF) 
 
 
 Phono: 80dB Aux: 85dB 
 
 
 
 
 <More> 
 
 
 
 
 Input terminal 
 
 
 Phono, Tuner, Aux, Tape play, 4CH Aux, 4CH Disc, Main in 
 
 
 
 
 Output terminal 
 
 
 Pre out, Rec out, SP out 
 
 
 
 
 DIN terminal 
 
 
 1 system 
 
 
 
 
 Attached circuit 
 
 
 Tape monitor Sound Field Composer 
 
 
 
 
 The semiconductor used 
 
 
 Transistor: 45 pieces Diode: 24 
 
 
 
 
 Power outlets 
 
 
 Power switch interlock: Dual power switch unsynchronized: 1 system 
 
 
 
 
 Power 
 
 
 AC100V, 50Hz/60Hz 
 
 
 
 
 External dimensions 
 
 
 138 × depth 296mm height width 420 × 
 
 
 
 
 Weight 
 
 
 10kg