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Sharp Optonica RP-7705

Turntable Details

Drive

Direct

Motor

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Wow & Flutter %

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Rumble [dB]

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Speed

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Dimensions [mm]

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Platter Material

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Platter Diameter [mm]

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Total Weight [kg]

Tonearm

Year Built

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Platter Weight [kg]

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Plinth Material

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Price

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Additional information

The Sharp Optonica RP-7705 is a high-end, fully automatic, quartz-locked direct-drive turntable produced in 1979. It is notable for its advanced track selection system and robust engineering, making it a standout model in the vintage turntable market.


Key Specifications


  1. Drive System:
    Quartz-locked direct-drive mechanism ensuring precise and stable platter rotation.
    Speeds: Supports 33⅓ RPM and 45 RPM with pitch control adjustable ±4%.

  2. Platter:
    Aluminum die-cast platter designed for low resonance and smooth rotation.

  3. Tonearm:
    Statically balanced tubular tonearm.
    Equipped with an Automatic Program Locate Device (APLD):
    A secondary optical sensor arm detects the gaps between tracks, allowing users to select specific tracks for playback.
    The APLD system uses light reflection to identify track gaps and position the tonearm accurately.

  4. Operation:
    Fully automatic functionality, including:
    Automatic start, stop, and return.
    Programmable track selection via APLD.
    Repeat function for continuous playback of a selected track or side.
    Manual controls for cueing and speed adjustments.

  5. Pitch Control:
    Quartz speed lock with manual override for fine speed tuning.

  6. Build Quality:
    Heavy-duty construction with a glass dust cover for durability and aesthetics.
    Weight: Approximately 20 lbs (9 kg), contributing to vibration resistance.

  7. Cartridge Compatibility:
    Compatible with standard cartridges; often paired with models like the Acutex LMP315 or Grado cartridges for enhanced sound quality.

  8. Additional Features:
    LED indicators for track selection.
    RCA stereo outputs for integration with hi-fi systems.
    Power Consumption: 10W at 120V AC, 50/60 Hz.


Performance Highlights


  • APLD System: The standout feature of the RP-7705 is its ability to detect track gaps and allow users to select specific tracks for playback, a rare capability in turntables of its era.

  • Quartz Lock Stability: The quartz-controlled motor ensures exceptional speed accuracy with minimal wow and flutter.

  • Convenience: Fully automatic operation combined with programmable playback makes it user-friendly while maintaining audiophile-grade performance.

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