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Phonostages — Pro-Ject Tube Box S3 B

Description, images, technical data and specifications

Pro-Ject Tube Box S3 B
Image source — © Pro-Ject

Pro‑Ject Tube Box S3 B is a premium-class tube phono preamplifier for MM and MC cartridges. It is equipped with ECC83 tubes and a fully symmetrical circuit, delivering warm, detailed sound with excellent dynamics. It supports balanced connection (mini‑XLR/XLR) and flexible tuning for different cartridges. The compact metal housing, concise design, and assembly in Europe make it ideal for audiophile vinyl systems.

Specifications

  • Model name

    Tube Box S3 B

  • Inputs (balanced)

    1

  • Inputs (single-ended)

    1

  • MC current-sensing input impedance (Ω)

    10, 50, 100, 1000, 47 000

  • MM/MC voltage input impedance (Ω)

    N/A

  • Output impedance (Ω)

    N/A

  • Gain (dB)

    40, 45, 60, 65

  • Playback EQ curves accuracy (dB)

    N/A

  • Frequency response low +/- 3dB (Hz)

    N/A

  • Frequency response high +/- 3dB (Hz)

    N/A

  • Total Harmonic Distortion + Noise (%)

    <0,005 MM, < 0,01 MC

  • Dimensions (mm)

    206 x 81 x 153

  • Weight (kg)

    1.01

  • Official link

    https://www.project-audio.com/en/product/tube-box-s3-b/

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