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Pro-Ject Tube Box DS3B Balanced Phonostage

Pro-Ject Tube Box DS3B Balanced Phonostage

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Regular price $1,099 In stock now!
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Pro-Ject Tube Box DS3B Balanced Phonostage

An MM or fully balanced MC phonostage with 6922 tubes, two inputs, and many settings. Made in Europe

Tube phonostages have been an integral part of Pro-Ject's product portfolio for many years. The latest Tube Box DS3 B adds balanced capability to the mix, making this Pro-Ject's first true balanced tube phono preamp. The design benefits from an outstanding dual-mono circuit layout with discrete components assembled with expertise in Europe. It’s a hybrid design utilizing tubes in the input and gain stages. All electrical components (including the tube output stage) are audiophile-grade, merging to deliver breathtaking sound quality from your turntable and phono cartridge.

In addition to settings for moving magnet cartridges, the Tube Box DS3 B allows you to upgrade to true balanced operation with a moving coil cartridge on most Pro-Ject turntables. This allows the input circuit to subtract hum and noise picked up during the transmission.

The Tube Box DS3 B comes in a steel and aluminum chassis providing very high rigidity and splendid isolation from interference. Tube Box DS3 B is available in silver or black. Magnetic wooden side panels are sold separately.

Advanced Circuitry

The Tube Box DS3B will let you connect two turntables at the same time, one balanced, one single-ended. Switching between the two tables and their settings is conveniently available on the front panel. Input settings for each input are stored individually and recalled automatically.

A large gain range from 40dB up to 65dB is possible. You can match it with a wide variety of cartridges and seamlessly integrate it into the rest of your system, matching the volume levels accurately to other sources like CD players or streaming devices. 


  • Balanced XLR inputs and outputs
  • Balanced mini XLR input
  • Continuously variable cartridge loading
  • Precise RIAA equalization
  • Low-noise, low-distortion circuitry
  • MM and MC capable
  • Dual-mono design
  • Subsonic filter
  • Aluminum chassis shields RF/EMI
  • Available in silver or black
  • Optional magnetic wooden side panels
  • Made in Europe


    Tube Complement: 2 x 6922/E88CC

    Input Impedance: 10-1,000 ohm, 47 kOhm

    Capacitance: 50, 150, 300, 400 pF

    Gain: 40, 45, 50, 55, 60, 65 dB

    Output voltage: 500 mV @ 1 kHz (at 5 mV input voltage @ 1 kHz)

    RIAA Equalization Curve Accuracy (20 Hz-20 kHz): < 0.5 dB 

    Inputs: 1 x 5-pin mini XLR, 1 x pair XLR, 1 x pair RCA

    Outputs: 1 x pair RCA, 1 x pair XLR

    Power supply: 18 V/1,000 mA DC

    Power consumption: 750 mA DC, < 0.5 W standby

    Dimensions (WHD): 8.11" x 3.54" x 8.94”

    Weight, without PSU: 3.44 lb.