Audio Database 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