Pioneer PC-770EX
¥ 25,000 (around 1974)
Commentary
MM type cartridge developed for CD-4.
An aluminum alloy of 0.5 mm diameter and 40 μ m is used for the cantilever, realizing a vibration system with a light weight of 0.4 mg.
The needle tip is a 0.2 mm square ultra-small block diamond needle polished with Pate Marconi type. Suspension wire system is used to support the vibration system to reduce non-linear strain caused by pulling in the trace forward direction.
The material used is nylon 6 which prevents ringing caused by wires.
Model Rating
| Type | MM Type Cartridge for Discrete 4 ch |
| Structure | Inside : Super Permalloy Shield External : Injection mold |
| Needle tip | 0.2 mm Square Block Diamond Putty Marconi type polishing |
| Effective mass of vibration system | 0.4mg |
| Operating needle pressure range | 0.75g ~ 1.8g (1.5g appropriate) |
| Frequency characteristic | 10 Hz to 60 kHz |
| Channel separation | 30 dB or More (1 kHz) 22 dB or More (100 Hz to 50 kHz) |
| Output voltage | 2.3 mv (1 kHz, 50mm/s) |
| Output balance | 0.5 dB or less |
| Dynamic Compliance | 14x10-6cm/dyne |
| Static Compliance | 25x10-6cm/dyne |
| Vertical tracking angle | 15 ° |
| Output impedance | 2k Ω (1 kHz) |
| Load resistance | 30k Ω ~ 250k Ω (CD-4 recommended 100k Ω) |
| Mounting Dimensions | JIS and EIA standards |
| Exchange needle | PN-770EX |
| External dimensions | 18 mm wide x 17.5 mm high x 31.7 mm deep |
| Dead weight | 5.1g |