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Amplifier JVC MCA-V7

JVC_MCA_V7E.jpg
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