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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





Nikko NR-515 receiver

 

The Nikko NR-515 Stereo receiver delivers 18 watts per channel, minimum RMS per channel, both channels driven into 8 ohms from 20 Hz to 20 kHz with no more than 0,5% Total Harmonic Distortion. The reliable and accurate NR-515 is loaded with features that will provide a maximum of listening enjoyment, included are phase-lock-loop, FM multiplex circuitry, and a high performance IC in the AM section and phase linear ceramic filters provide low distortion, maximum stereo separation, low noise and extreme stability.

Other features include two-speaker switching, separate bass and treble controls, balance control, volume control, loudness, mono, and tape monitor switching. Additional features include 4-way function selector, a large oversized center tuning meter, and Nikko's own wxclusive circuit breakers.

The NR-515 is an able performer. FM sensitivity is a usable 2,2 µV, FM selectivity is 55 dB while image rejection is 55 dB. Stereo Separation is 40 dB (at 1khz). Am signal-to-noise and image rejection figures are both 45 dB. The NR-515 is built to rigid specifications and provides a maximum of sound for a reasonable price.

 

Specifications:

FM Tuner Section

Sensitivity (IHF) Stereo :  2,2 µV

Selectivity. Alt. Channel :  55 dB

Image Rejection:  55 dB

IF Rejection:  75 dB

Total Harmonic Distortion

Stereo  (65 dBf) :  0,6 %

Mono (65 dBf) :  0,3 %

Stereo Separation:  40 dB at 1 kHz

Capture Ratio:  2,0 dB

AM Tuner Section

Selectivity:  30 dB ( ±10 kHz)

Image Rejection:  45 dB

IF Rejection:  35 dB

Signal-to-Noise Ratio:  45 dB

Power Amp Section

Minimum Rated Power RMS:  18 watts per channel, both channels driven, into 8 Ω

Total Harmonic Distortion:  0,5 %

Frequency Response:  20 Hz - 20 kHz

Dimensions (W x H x D):  17-5/16" x 5-5/16" x 11-13/16"

Weight:  14,7 lbs

 

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