Accuphase AC-1
¥ 38,000 (released in October 1979)
Commentary
An MC cartridge developed by combining the music playback capabilities of classic products with modern technology.
The cantilever is made of thick German-made aluminum and magnesium alloy with an emphasis on rigidity. In addition, beryllium material is placed on 60% of the total length. This realizes high stiffness while being a roving mass.
This structure realizes a high-frequency reproduction limit of 60 kHz, and Q-damping improves saddle characteristics which become concave in the range from 5 kHz to 10 kHz.
The dumped damper system is adopted for the damper part, and the vibration of the main damper is absorbed by placing another damper outside the main damper, thereby suppressing the natural vibration of the damper caused by the movement of the vibrator.
The magnet is a samarium cobalt magnet, and the DC magnetic field strength of the magnet is adjusted so that the operating point on the hysteresis characteristic of the armature becomes perfectly linear, and it is set to 65% of the saturation point.
The core of the armature is made of high-quality permalloy which is the most stable magnetic material.
A high-purity copper wire of 0.035 mm φ, which belongs to the largest diameter of the MC cartridge, is used for the coil, and the output of 0.2 mV is obtained even though the number of turns is less, and thus the impedance is kept low.
The body is made of aluminum diethe body, giving sufficient consideration to the rigid body and internal loss. In addition, the contact surface with the shell is finished to a flat surface without unevenness to increase the strength when attaching the shell.
Pay attention to the fluctuation of the output voltage caused by the needle pressure change due to warping of the record, etc., and there is almost no change in the output voltage between 1.0 to 3.0 gr.
Because the vibration system is fixed, only the needle tip cannot be replaced and the needle was replaced with a new one.
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Model Rating
| Type | MC Cartridge |
| Power generation system | Moving-coil type |
| Output voltage | 0.2 mV (5cm/sec., 1 kHz) |
| Frequency characteristic | 20 Hz to 60 kHz 20 Hz to 20 kHz ± 1 dB |
| Channel separation | 30dB(1kHz) |
| Channel balance | 0.5dB(1kHz) |
| Compliance | Horizontal : 15x10-6cm/dyne Vertical : 15x10-6cm/dyne |
| Traceability | 80 μ m (300 Hz, 2.0 gr) |
| Needle pressure vs. output voltage deviation | 0 dB (Needle Pressure 1.0 gr ~ 3.0 gr) |
| Internal impedance | 4 Ω |
| Recommended load impedance | When a head amplifier is used : 50 Ω or more When using step-up transformer : 3 Ω or more |
| Vertical tracking angle | 20 ° |
| Regenerative needle | Line contact type diamond |
| Curvature radius | 6 μ mx35 μ m |
| Operating needle pressure range | 1.5 gr ~ 2.5 gr |
| Proper needle pressure | 2.0gr |
| Dead weight | 9.5gr |
| Needle exchange | Body replacement (¥ 25,000) |