Audio Database

530

Nakamichi 530
137,000yen(around the 1978 time)

Description
 
The stereo receiver which attained quality improvement so that it could use in the form of the 2nd main system.

If it is considered as the auto-tuning, a pointer moves only by pushing a tuning switchpoint and all FM tuning collides with an office, a tuning indicator will light up and it will tell the optimal location.
Furthermore, four offices of choice can be preset beforehand and it always tunes automatically on the office of choice.
Moreover, the circuitry had the performance almost equivalent to 730 which is a high-end model, and the separation property which stopped the distortion and was stabilized has been acquired.

In the preamplifier part, a double NF circuitry is adopted as a phone equalizer, a failure of an input signal is prevented, and the distortion is stopped.

The power amplifier part has adopted the pure complementary circuit as a basic circuit, and serves as circuitry which suppressed the power dissipation and the exothermic.
Moreover, distortion is reduced by the double NF circuitry which applied NF also to the input capacitor.


Rating of a mode
Form Receiver
<Power amplifier part>
Effective output (10Hz - 20kHz) 80W+80W (4 ohm, 0.05%)
55W+55W (8 ohm, 0.02%)
THD 0.003% or less (1kHz or less)
0.006% or less (10kHz or less)
Cross modulation distortion (60Hz:7kHz=4:1) 0.002% or less (8 ohms, Aux->SP Out, 55W)
Power bandwidth (8ohm, 27.5W) 10Hz - 50kHz (0.1% of distortion)
10Hz - 20kHz (0.01% of distortion)
Dumping factor 80 (8 ohms, 1kHz) or more
Remains noise 0.03mV or less
Frequency characteristic (Main In->SP Out) 5Hz-50kHz+0 -3 dB
Input sensitivity/impedance 1V/100kohm
<Preamplifier part>
Input sensitivity/impedance Phono: 2mV / 50kohm
AUX: 150mV / 100kohm
Tape: 150mV / 100kohm
Frequency characteristic (RIAA deflection) ±0.3dB
Phone maximum permissible input 130mV
Tone control Bass: ±12dB (20Hz)
Treble: ±12dB (20kHz)
An Output voltage/impedance Rec Out: 150mV/330 ohm
Pre Out: 1V/560 ohm
Subsonic Filter 30Hz:+0.8dB
10Hz:-30dB
S/N ratio Phono (IHF-A): 84dB or more (-138dB input scaling ratio)
AUX, Tape: 98dB or more (-115dB input scaling ratio)
Loudness (Volume-40dB, 1kHz Ref.) 20Hz:+14dB
20kHz:+6dB
Channel separation 80dB or more (Phono->SP Out, 8 ohms, 1kHz)
Headphone output (8ohms) 60mW (maxima)
<Tuner part>
Received frequency 76MHz - 90MHz
Practical speed (IHF, 84MHz, 300ohms) mono: 2.2 microvolts / 12.1dBf
S/N50dB sensitivity mono: 5 microvolts / 19.2dBf (300ohms)
stereo: 55 microvolts / 40dBf
Image stonewalling ratio (84MHz) 85dB
IF stonewalling ratio (84MHz) 90dB
Spurious stonewalling ratio (84MHz) 90dB
SCA rejection 70dB
AM supression ratio 55dB
Capture ratio 1.5dB
Effective selectivity (±400kHz) 75db
S/N ratio mono: 75dB or more (65dBf)
stereo: 68dB or more
THD mono: 0.15% or less (1kHz)
stereo: 0.2% or less
Stereo separation 1kHz : 45dB or more
10kHz : 30dB or more
Frequency characteristic mono: 0.15% or less (1kHz)
stereo: 0.2% or less
Auto-tuning threshold level 20dBf, 40dBf
<Synthesis>
Supply voltage AC100V, 50Hz/60Hz
AC outlet 150W maxima
Power consumption 350W
Dimensions Width 500x height 130x depth of 350mm
Weight 12.35kg