JEWEL TONE MP-30J/MP-30HJ
MP-30J : ¥ 33,000 (around 1979)
MP-30HJ : ¥ 35,000 (around 1980)
Commentary
An MP cartridge with an Al impact frame to suppress excessive resonance.
MP-30J is a cartridge stand-alone model and MP-30HJ is a head shell attached model.
The chip size has been reduced to 1/3 of the conventional size, reducing distortion and loss.
A boron cantilever is used for the cantilever to realize excellent characteristics.
Resonance is eliminated by using screw connection between the stylus knob and body.
Uses samarium-cobalt magnet.
High magnetic shielding characteristics are obtained by the super permalloy shield case, and high SN ratio is secured.
0.2tx0.1tMm laminated yoke has been adopted.
Carbon ABS cylinder is adopted.
The terminal pins are gold-plated.
Magnesium alloy is used for the head shell, and copper Litz wire of 99.99% purity is used for the wiring part.
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Model Rating
| Type | MP Cartridge |
| Format | MP (Moving Permalloy) Type |
| Playback frequency range | 20 Hz to 25 kHz |
| Channel separation | 25dB(1kHz) |
| Output voltage | 3.0 mv (1 kHz, 50mm/sec) |
| Output balance | 1.0dB(1kHz) |
| Load resistance / load capacity | 47k Ω / 100 pF |
| Dynamic Compliance | 10x10-6cm/dyne |
| Static Compliance | 22x10-6cm/dyne |
| Internal impedance | 4,300 Ω (1 kHz) |
| Cantilever | Boron |
| Needle tip | Triangular Tip Diamond 0.4x0.7 mil Elliptical Needle |
| Needle pressure range | 1.3 to 1.8 gr (appropriate 1.5 gr) |
| Exchange needle | JN-P30(¥12,000) |
| Weight | 9.0gr |
| Head shell | Magnesium head shell |