DENON DL-107
¥ 13,800 (released in February 1969)
¥ 15,000 (around 1978)
Commentary
MM type cartridge using power generation system developed by DENON.
The vibration system has a structure in which the cross-shaped armature wound with the generator coil of DL-103 is replaced with a disc-shaped magnet, and the magnet is replaced with a 6-pole yoke (core) and coil.
The magnetic circuit has an E-shaped structure. Two sets of magnetic circuits are arranged around the disc magnet at 90 ° angles for the left and right channels with a fixed distance. This magnetic circuit structure is unique to DENON and different from the conventional MM type. This improves the high-frequency characteristics and enables record playback with excellent linearity.
It adopts DENON's original double structure cantilever, and satisfies both rigidity and weight reduction of equivalent mass simultaneously.
This reduces the slack in the mid - and high-frequency characteristics due to split vibration and improves the high-frequency characteristics.
The disk-shaped magnet uses an anisotropic lightweight ferrite magnet with strong holding force to reduce the vibration system as a whole and increase output.
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- Power generation principle
When a disc-shaped magnet with a support point on the extension line of the central pole of an E-shaped core moves around the support point, the magnetic lines of force indicated by broken lines in the figure change to a differential with respect to the magnetic lines of force indicated by solid lines in the figure. At the central pole, magnetic flux of the sum of opposite phases due to both magnetic lines of force is generated, and voltage is induced in the coil.
If the supporting point of this magnet is accurate, even if the magnet is inclined slightly due to the sinking of the needle tip by the needle pressure, the push-pull method makes the waveform symmetrical with respect to the top and bottom, and the reproduced sound with less distortion can be obtained.
Model Rating
| Type | MM Type Cartridge |
| Output voltage | 2.0 mv (1 khz, 5cm/s, horizontal direction) |
| Playback frequency range | 20 Hz to 30 kHz |
| Output impedance | 2.8k Ω (DC 1.9k Ω) |
| Adaptive load impedance | 50k Ω |
| Channel separation | 20 dB or More (1 kHz) |
| Channel balance | Within 1 dB (1 kHz) |
| Compliance | 8x10-6Cm / dyne (100 Hz, measured in records) |
| Needle tip | Solid diamond round needle Radius of curvature 16.5 microns (0.65 mil) |
| Proper needle pressure | 2.0 ± 0.3g |
| Dead weight | About 8.0g |
| Needle exchange | DSN-20(¥7,200/1978) |
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