Perfect unit of one Walkman Professional Sony WM-D6C, clean, calibrated to the factory specifications.

It comes with the following original Sony Accessories:

• Sony Microphone Model ECM-909A
• Lavaliere Electret Microphone
• Sony Original Strap

The Sony WM-D6C, also known as the Walkman Professional, is widely regarded by audiophiles and audio engineers as the greatest portable cassette recorder ever made. 

Introduced in 1984 and produced until 2002, this iconic "brick" bridged the gap between pocket convenience and studio-grade master recording. 

Key Technical Specifications:

The WM-D6C stands out because its engineering specifications matched those of full-sized, high-end home cassette decks. 

• Quartz-Locked Disc Drive: Unlike standard Walkmans that used rubber belts prone to stretching and speed drift, the WM-D6C features a quartz-controlled motor that drives the capstan directly via a rubber ring. This keeps wow and flutter down to an incredible 0.04% WRMS, making the playback immune to pitch changes while walking or moving.
• Dolby C Noise Reduction: It was the first portable recorder to integrate Dolby C alongside Dolby B. This custom Sony microchip circuit provided a massive 20dB of noise reduction at high frequencies.
• True Line-In and Line-Out: It features dedicated 3.5mm line jacks that bypass the internal microphone preamp. This allowed bootleggers, journalists, and musicians to pull crystal-clear analog audio straight from live mixing boards.
• Tape Support: Features a manual tape selector supporting Type I (Normal), Type II (Chrome/CrO₂), and Type IV (Metal) tapes for both playback and recording.
• Power & Performance: Powered by 4 AA batteries or a 6V DC adapter. It includes a 5-LED VU peak meter to adjust recording levels manually.