Nakamichi 530
¥ 137,000 (around 1978)
Commentary
A high-quality stereo receiver that can be used as a second main system.
The tuner section has a self-lock tuning mechanism.
In this system, a kind of electronic servo is operated by detecting the deviation of the local oscillation frequency to suppress the tuning deviation forcibly. In the 530, this self-lock tuning is linked to the motor drive mechanism for self-tuning by soft touch, and four preset stations are also available.
A low-noise dual-gate MOS-FET is used in the front end section to reduce various kinds of distortion generated in the high-frequency Zofuku-ji Temple. In addition, multi-stage tuning is performed by an air varicon, which is essentially excellent as a tuning element, to increase the image interference ratio, IF interference ratio, spurious interference ratio, etc., and excellent interference rejection capability is obtained.
A specially selected high-quality ceramic filter is used in the IF section to achieve both low strain and selectivity.
The MPX section uses a PLL circuit to suppress degradation of the separation and enable stable stereo reproduction.
If you want to receive only broadcasting stations with high antenna input sensitivity, turn the threshold switch off. If you want to receive broadcasting stations with high antenna input sensitivity, turn the switch on (20 dBf).
Equipped with an automuting mechanism.
If the tuning point deviates from the tuning point during auto tuning or 4-station preset tuning, muting is automatically applied to eliminate inter-station noise.
The phono equalizer circuit of the preamplifier uses a double-N circuit to prevent degradation of the input signal and to reduce distortion.
Pure complimentary service circuit is used for the basic circuit of the power amplifier section to reduce power loss and heat generation.
The distortion is also reduced by using a double NF circuit in which NF is applied to the input capacitor.
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Model Rating
| Type | Receiver |
| Power Amplifier Unit | |
| Effective output (10 hz to 20 khz) | 80W + 80W (4 Ω, 0.05%) 55W + 55W (8 Ω, 0.02%) |
| Total harmonic distortion factor | 0.003% or Less (1 kHz or Less) 0.006% or Less (10 kHz or Less) |
| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.002% or Less (8 Ω, Aux to SP Out, 55W) |
| Power Bandwidth (8 ω, 27.5W) | 10 Hz ~ 50 kHz (Distortion 0.1%) 10 Hz ~ 20 kHz (Distortion 0.01%) |
| Damping factor | 80 or More (8 Ω, 1 kHz) |
| Residual noise | 0.03 mV or less |
| Frequency Response (Main In → SP Out) | 5 Hz ~ 50 kHz + 0 -3dB |
| Input Sensitivity / Impedance | 1V/100k Ω |
| Preamplifier Section | |
| Input Sensitivity / Impedance | Phono : 2mV/50k Ω AUX : 150mV/100k Ω Tape : 150mV/100k Ω |
| Frequency response (RIAA deviation) | ± 0.3 dB |
| Phono maximum allowable input | 130mV |
| Tone control | Bass : ± 12 dB (20 Hz) Treble : ± 12 dB (20 kHz) |
| Output Level / Impedance | Rec Out : 150mV/330 Ω Pre Out : 1V/560 Ω |
| Subsonic filter | 30Hz:+0.8dB 10Hz:-30dB |
| Signal-to-noise ratio | Phono (IHF-A) : 84 dB or more (-138dB input conversion ratio) AUX, Tape : 98 dB or more (-115dB input conversion ratio) |
| Loudness (Volume-40dB, 1 kHz Ref.) | 20Hz:+14dB 20kHz:+6dB |
| Channel separation | 80 dB or More (Phono → SP Out, 8 Ω, 1 kHz) |
| Headphone output (8 Ω) | 60 mW (max.) |
| Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical Sensitivity (IHF, 84 MHz, 300 Ω) | Mono : 2.2 μ V/12.1 dBf |
| S/N50dB sensitivity | Mono : 5 μ V/19.2 dBf (300 Ω) Stereo : 55 μ V/40dBf |
| Image interference ratio (84 MHz) | 85dB |
| IF Interference Ratio (84 MHz) | 90dB |
| Spurious interference ratio (84 MHz) | 90dB |
| SCA Rejection | 70dB |
| AM suppression ratio | 55dB |
| Capture ratio | 1.5dB |
| Effective selectivity (± 400 kHz) | 75db |
| Signal-to-noise ratio | Mono : 75 dB or greater (65 dBf) Stereo : 68 dB or higher |
| Total harmonic distortion factor | Mono : 0.15% or less (1 kHz) Stereo : not more than 0.2% |
| Stereo separation | 1 kHz : 45 dB or more 10 kHz : 30 dB or more |
| Frequency characteristic | 30 Hz to 15 kHz + 1 -1.2 dB |
| Auto-tuning threshold | 20 dBf, 40 dBf |
| <General> | |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| AC outlet | 150W Max |
| Power consumption | 350W |
| External dimensions | Width 500x Height 130x Depth 350 mm |
| Weight | 12.35kg |