Nikko Alpha 440
Stereo Power Amplifier (1980-81)
The Alpha 440 is Nikko's most highly regarded Direct Current Power Amplifier with its latest technology in the art of electronic circuitry. This Alpha 440 comes with numerous distinctive features. It was specifically designed for professional usage in mind, however, it can be easily adapted to home and studio use.
The output power level indicator utilizes 13 LED (Light-Emitting Diodes) per channel. It will continuously indicate from 0.01 to 200 watts range.
Because this amplifier is in concept a DC design, by changing the switch to the DIRECT mode, you can enjoy the ultra-low frequency response, no-phase shift, function of the superb tone quality.
The Headphone jack feature means that instead of receiving the sound from the speakers you
can monitor the sound through headphones.
A and B two speaker system combination is possible. The selection is dependent on the manipulation of the selector switch on the panel. The internal relay governs the tone quality and the depreciating damping factor, keeping these at a minimum.
The voltage amplification section is a three stage balanced differential amplifier circuit. Dual FET
(Field-Effect Transistor) low distortion rated with low drift design is incorporated in the initial stage.
The newly developed power transistor with its greater power dissipation and higher frequency amplification possibilities are being used in pairs in parallel. Irrespective of the unit, the fast acting low distortion switch make-up the amplifier.
Advanced circuitry is incorporated to attenuate the amount of distortion during switching. No matter how excessive the input power of the music might be, the output power transistor will not cut off and the music is faithfully reproduced.
A Direct Current Servo Circuit suppresses unnecessary DC drift in the amplifier. DC servo circuit's main function is to stabilize the DC amplifier.
The speakers and the amplifier unit will be protected from damage if and when there is a malfunction due to DC leakage or excessive electrical current flow. The LED will light up on the panel under such a condition.
The input power sensitivity can be adjusted separately for each left and right channels at the rear panel respectively.
Power output: 220 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.008%
Damping factor: 150
Input sensitivity: 1V
Signal to noise ratio: 115dB
Dimensions: 482 x 182 x 460mm
instruction/owners manual - ferusso
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Reviewed May 02nd, 2015 by fatagnus
I am startled at the clarity and isolated instrument voices as well as their extended timbre - you could be standing among the player in a small ensemble. Hats-off to the Nikko folks.