NEC A-10

Commentary

This pre-main amplifier was completed by focusing on the ideal amplifier and basic performance, and by putting all NEC's technologies into it.

In addition to five stage independent power supply units, a newly developed reserved power supply unit is installed in the power supply unit.
In the case of conventional capacitor input type power supply, since the current is discontinuous pulse flow by repetition of 100 Hz to 120 Hz, there is a time when the current does not flow, and there is a disadvantage that the power supply voltage drops even if a large output is obtained when the capacitor is discharged.
To overcome this drawback, a reserve power supply was developed. When the charging current is interrupted, a second power supply is activated to bring the charging current closer to a continuous uniform flow.
This reduces the peak value of the charging current, reduces the impedance of the power supply, and increases the current supply capacity. The power supply ripple is also reduced by approximately 8 dB, enabling low-frequency reproduction without distortion even at high output.

Equipped with a high-gain MC head amplifier.
It is high positive with 3 para push connection of low noise and high gain FET, and it corresponds to the size of the output depending on the type of cartridge between low position and high position equipment.

It is equipped with an operation switch that can be used to separate the preamplifier and power amplifier.
When the switch is set to "SEPARATED", the input of the power amplifier section and the output of the preamplifier section are separated, so that they can be used independently.
The input level of the power amplifier section is adjustable independently on the left and right.

Equipped with a subsonic filter.

Three stage (-10, -20 and -30dB) attenuators are provided for precise volume control.

Equipped with a power output level control that can be used as an output volume when a balance control or power amplifier is used independently.

Equipped with a REC selector.

Model Rating

Type	High-quality integrated amplifier
Power Amplifier Unit
Circuit system	All-stage direct DC servo circuit
Effective output (both channel drive Sine wave continuous output, 20 Hz to 20 kHz)	120W + 120W (4 Ω) 60W + 60W (8 Ω)
Total harmonic distortion factor (at effective output)	Not more than 0.003%
Cross modulation distortion factor (at effective output)	Not more than 0.003%
Frequency characteristic	5 Hz to 300 kHz
Input Sensitivity / Impedance	1.23V/20k Ω
Preamplifier Section
Circuit system	All-stage direct DC servo circuit
Input Sensitivity / Impedance	Phono MM : 2.5mV/47k Ω Phono MC (Low) : 80 μ V/10 Ω Phono MC (High) : 250 μ V/100 Ω CD, Tuner, AUX, Tape1, 2 : 150mV/20k Ω
Output Level / Impedance	Rec Output : 150mV/100 Ω Preamplifier output : 1.23V/600 Ω
Signal-to-noise ratio	Phono MM:90dB(-142dBV) Phono MC (Low) : 72dB/80 μ V (-154dBV) Phono MC (High) : 82dB/250 μ V (-154dBV) CD, Tuner, AUX, Tape1, 2 : 110 dB (-126dBV)
RIAA deviation	10 Hz to 100 kHz ± 0.2 dB or less
Phono maximum allowable input	MM:300mV
Attenuator	0, -10dB, -20dB, -30dB
Subsonic filter	15 Hz (-3dB, 6dB/oct.)
Input-output phase	Inphase
<General>
Power supply circuit system	Stage independent shunt regulator system + reserve power supply
Power consumption	230W
External dimensions	Width 430x Height 150x Depth 430 mm
Weight	20kg