What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Nakamichi Amplifier 1

Harmonic Time Alignment circuit topology
In the preamp and power amp stages , open-loop gain is designed with a high cut-off point, and local NFB (negative feedback) is used sparingly. This approach faithfully preserves the phase relationship of the music signal and distortion components, making distortion all but inaudible. Musical expression therefore is utterly natural and transparent.

Line amplifier stage with discrete components
The line amplifier consists only of strictly selected high-quality parts. The open-loop gain frequency response is designed to be flat, to bring out the full potwntial of the Harmonic Time Alignment principle.

High current capability
The power transistors are amply dimensioned, yielding a peak current capability of 28 amperas (Amplifier 1) or 18 amperas (Amplifier 2). In addition, the large power transformer and large filtering capacitors provide the necessary muscle to drive even  very low impedance speakers with ease.

Multi-regulated Power Supply
Separate rransformer windings are provided for the control section and the audio signal circuitry, to prevent interference between stages. The phono stage and the line amplifier stage have dedicated locl power regulators which provide stable and clean current.

Isolated ground principle
The phono stage and the line amplifier stage employ Nakamichi's original isolated ground design. This ensures that the ground potential always remains constant, resulting in stable signal transmission.

System Remote capability

The supplied remote control unit can be used to operate not only the amplifier but also other connected Nakamichi components.
Specifications
Power Section
Continuous Average Output Power (both channels driven, 20-20,000 Hz, 0,1%T.H.D.):
80 watts per channel into 8 Ω
130 watts per channel into 4 Ω
Dynamic Output Power:
180 watts per channel into 4 Ω
270 watts per channel into 2 Ω
Power Bandwidth:  10 -50,000 Hz
Frequency Response:  20 -20,000 Hz +0, -0,5 dB (5 - 80,000 Hz +0, -3 dB)
Signal-to-Noise Ratio (A weighted, Input Shorted):  better than 105 dB re rated power  (better than 83 dB , IHF-A 202)
Total Harmonic Distortion (8 Ω , rated power, 20 - 20,000 Hz) :  0,1% or less
Headphone Output (into 40 Ω ):  187 mW
Output Current Capability:  28 A peak per channel
Preamplifier Section
input Sensitivity/Impedance:
Phono MC :  0,125 mv/100 Ω
Phono MM :  2,5 mv/47 k Ω
CD, Tuner, Tape, Aux :  150 mv/20 kohm
Maximum Input Level (1 kHz):
Phono MC :  9 mv
Phono MM :  180 mv
Output Level/Impedance:
Rec Out :  150 mv/1,5 k Ω
Total Harmonic Distortion (1 kHz, Rec. Out, 1 V Output Level):
Phono MC :  0,1% or less
Phono MM :  0,008% or less
RIAA Deviation
Phono MC /MM :  30 - 20,000 Hz ±0,5 dB
Signal-to-Noise Ratio
Phono MC :  70 dB
Phono MM :  82 dB
Tone Controls
Bass :  20 Hz ±10 dB
Treble :  20 kHz ±10 dB
General
Power Source:  120, 230, 240 or 110, 120, 220, 240 V AC , 50/60 Hz
Power Consumption:  600 W max.
Dimensions (W x H x D):  430 x 125 x 360 mm
Weight:  15,0 kg

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