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Please listen to the sound test HERE!!: https://youtu.be/KXJcmAjCC5E

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SPECIFICATIONS

Includes: Main unit

Cosmetic condition: Near-mint
      - Very slight scratches on the door, no other obvious marks. This unit is in great condition.
      - Unique and interesting design, with an attractive colour scheme.

Mechanical condition: Very good
      - Plays as it did when new. Excellent clear, balanced sound quality.
      - Doesn't contain any electrolytic capacitors in the audio electronics, and is built to last far longer than a traditional
        Walkman
      Head condition (Sensitivity at 315hz)
      -------| Reverse side L:-3.0db |-------
      -------| Reverse side R:-2.8db |-------
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      -------| Forward side R:-2.0db |-------
      -------| Forward side L:-1.6db |-------
      A high number is good, but more consistent is best. Any difference between L/R smaller than 0.5db is considered inaudible.

      Wow/Flutter
      -------| Reverse side:~0.15% |-------
      -------| Forward side:~0.21% |-------


Build Quality: Excellent
      - Very thick all-metal body, built to withstand a lot of abuse.
      - Compact size- barely larger than a cassette case!

Battery life: Excellent
      - Around 35 hours (1400mah gumstick battery)
      - This model uses slim 'gumstick' batteries. These aren't included, but can be found newly-made online for cheap. Search ebay for 'gumstick battery' (such as Doublepow, nicjoy, jinmasi, etc.)

Compatibility:
      - Will play all tape types
      - Supports compatible Walkman remote controls (four pins)
      - Will run up to 8-300ohm headphones. Powers my Sennheiser HD-600 (300 ohms) very loud, without any issues.

GENERAL INFO

A fun and unique model from my collection- the Sony Walkman WM-EX631! released in 2002, it was one of the final & most popular models in Sony's elite 'WM-EX' series, and is notable for its unusual speed control feature. Featuring a fully logic controlled mechanism with auto-reverse, automatic track skip and blank-skip based on Sony's best chassis, this premium Walkman is a very cool (and practical) option for those looking for a high-quality, offline, portable music player without the distraction of a smartphone. The mechanism has been fully serviced, calibrated, demagnetised and rebuilt by myself, and fitted with a new DeckTech belt. A remote controller is not required to use this model.

Features:
- Auto reverse
     Plays both sides of the tape automatically (Press Play during playback to change sides)
- Automatic track skipping (16x speed, 9 tracks)
     Will automatically search for and play the next/previous song on a tape (FF/REW during playback)
- Repeat
     Repeats the current song indefinitely (Hold down Play during playback)
- Speed control
     Adjust the speed of the playback by +/- 20%!
- Cue/Review
     Plays a live feed of the tape as it's rewinding (Hold FF/REW during playback)
- Hold
     Disables all button inputs when this is triggered

If there are any issues with this Walkman within the first month, I'll fix it for free. Don't hesitate to message me if you have any questions. Thanks!