Nikko Audio's Alpha
220 is a 120 watts per channel power amplifier having a DC servo-feedback loop,
non-switching output circuitry, and a high slew rate The unit's input circuitr
uses dual field effect transistors (FEDs) for lowest noise and distortion; the
remaining stages employ wideband bipolar transistors. The amplifier has a slew
rate of 100 volts per microsecond and a rise time of one microsecond. Low
frequency signals are monitored and corrected by a DC servo-feedback loop.
The output stage is
operated in a continuous non-switching mode, using circuitry that tracks
transistor bias in synchonization with the music signal, to avoid excessive
heat generation and resultant cost associated with traditional Class A designs
while nonethless offering the exceptional degree of sonic clarity and openness
of Class A operation. Additional features include; protection circuits to
prevent speaker damage even if the preamp has a DC offest signal; front panel
headphone jack and speaker selector switches; indicator lamps that monitor
power-on and protection-circuit status.
Continuous Power
Output per Channel:
More than 120
watts - 20 -20,000 Hz at 8 Ω
More than 130 watts
- 20 - 20,000 Hz at 4 Ω
More than 120 watts
- 1000 Hz at 8 Ω
More than 130 watts
- 1000 Hz at 4 Ω
Total Harmonic
Distortion :
Continuous Power
Output at 8 Ω : no more than 0,008%
Continuous Power
Output at 4 Ω : no more than 0,02%
1 Watt power Output
(8 ohms): no more than 0,02%
Intermodulation
Distortion :
Continuous Power
Output at 8 Ω : no more than 0,01%
1 Watt Power Output
: no more than 0,02%
IHF Power Bandwidth
(8 ohms): 5 - 70,000 Hz
Damping Factor at
1000 Hz (8 ohms): more than 60
Frequency Response
(Normal Input 8 Ω)
At 1 Watt Power
Output : 10 - 100,000 Hz +0, -1 dB
Input Sensitivity
for 120 watts Power Output
Main In : 1 V ±2 dB
Signal-to-Noise
Ratio (IHF A network):
Main (Normal,
Direct) : better than 105 dB
Signal-to-Noise
Ratio (DIN Filter):
Main IN (Normal,
Direct) : better than 90 dB
Channel
Balance: no more than 1 dB
Residual Hum and
Noise, 8 Ω: no more than 0,5 mV
Idling Current: 40 - 120 mA
Midpoint
Voltage: 0 ±20 mV
Muting Delay
Time: 3 - 7 seconds
Power Requirements:
W-type : AC 120 V, 60 Hz
E-type : AC 220 V, 50 Hz
B-type : AC 240 V, 50 Hz
Power
Consumption: 480 W (620 VA)
Dimensions (W x H x
D): 482 x 138 x 344 mm (19" x
5-1/3" x 13-1/2")
Weight: 13,5 kg (29,7 lbs)
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