JVC VN-700
140 Watt Integrated Amplifier with 5-Zone S.E.A.
Despite its greater number of controls than other amplifiers in its class, the VN-700's front panel is not at all bulky and has a modern and pleasing aesthetic; the knobs and switches are rationally arranged, and the volume control is easily identifiable due to its size and position. The controls for the input selector, listening mode, and monitor inputs are very convenient, but the knobs for the multiple
tone control (<• SEA») are a bit too small. Its potentiometers operate in steps
to more easily set the boost or cut level. The subsonic filter is truly effective, quickly cutting the response curve below 18 Hz. The ability to engage the "SEA" equalizer even while recording and to output recordings in both directions is very useful.
The rear panel features two PHONO inputs (one of which has adjustable sensitivity and impedance), two TAPE inputs, and three auxiliary inputs, one
also with adjustable sensitivity. Essential for a system upgrade from stereo to quadraphonic are the duplicated outputs of the preamplifier section and connections for a quadraphonic decoder. The sockets are all jacks, with the addition of two DIN connectors that duplicate the tape inputs.
There are four Hitachi power transistors. The final stage is fully complementary symmetry with a power supply symmetrical with respect to ground and therefore without an output capacitor.Cooling is provided by a traditional
metal radiator. A relay disconnects the speaker connection.
The VN-700's internal layout is very tidy. At the top center is the printed circuit board for the "SEA," the long-throw input switch mounted near the rear panel, both for space reasons and to reduce the length of the wiring, which compromises the device's signal-to-noise ratio. All the connecting cables pass under the chassis' motherboard and are bundled. The construction is typical of Japanese amplifiers. The mounting brackets on which the circuit boards are mounted vertically are visible. This is an ideal solution for calibration or repairs.
Specifications
Type: Solid State Stereo Integrated Amplifier
Semiconductors: 32 Transistors; 14 Diodes;
Inputs: Phono 1 & 2;Aux 1, 2 & 3; Tape-Play 1 & 2; Main IN; 4-Channel Rear In
Outputs: Tape Rec 1 & 2; 2 x Pre-Out; 4-channel Rear Out; Speakers System 1 & 2; Headphones
DIN Socket: Tape 1, Tape 2
Front Panel Controls: Phono 1 Cartridge Load select & Level adjust
Power Amplifier Section
IHF Dynamic Power:
110 W (55 + 55 W) at 8 ohm load
140 W (70 + 70 W) at 4 ohm load
Continuous Power RMS
80 W (40 W + 40 W) at 8 ohm load one channel driven
100 W (50 W + 50 W) at 4 ohm load one channel driven
70 W (35 W + 35 W) at 8 ohm load both channel driven
80 W (40 W + 405 W) at 4 ohm load both channel driven
Power Bandwidth
10 Hz - 23 kHz (8 ohm load one channel criven, output power) 35 W THD 0,25%
25 Hz - 20 kHz (8 ohm load both channel driven, output power) 35 W THD 0,25%
THD 0,05% at rated power (1 kHz)
Intermodulation Distortion: 0,4% at rated power 0,1% at 1 W
fr 3 Hz - 450 kHz (-3 dB) at 1 W
Damping Factor: 50 Hz at 8 ohm load
Matching Load Impedance: 4 - 16 ohm
Input Sensitivity for Rated Power: 1 V
Preamplifier Section
FR 20 Hz - 50 kHz +_0,5 dB
S.E.A. Controls
Center Frequency : 40; 250; 1,000; 5,000; 15,000 Hz
Control Range: =-12 dB
Input Sensitivity For Rated Power:
Phono : 2,5 mV
Aux : 200 mV
Tape Playback : 200 mV
s/n Ratio
Phono : 55 dB
Aux : 82 dB
Equalizer: RIAA (Mag) =-0,5 dB
Phono Overload: 240 mV (p-p) at 1 kHz; 170 mV RMS
Recording Out Level
PIN Jack : 30 mV
DIN Jack : 180 mV
Filters
Subsonic : 18 Hz 12 dB/oct
High : 9 kHz -12 dB/oct
Muting: -20 dB
Power requirement: 110, 120, 220, 240 V 50/60 Hz
Power Consumption: 150 W
Dimensions whd 16-5/8" x 5-3/8" x 12-1/2"
Weight: 22 lbs