Pro-Ject Audio Tube Box DS3 B Balanced Phono Valve Pre-amplifier | Pro-Ject Audio Australia
Pro-Ject is represented in Australia by

Tube Box DS3 B

Balanced Phono Valve Pre-amplifier

The Tube Boxes have been an integral part of our product portfolio for many years. Now, the new Tube Box DS3 B adds balanced in- and outputs to the beloved tube amplification. This precision tube phono preamplifier benefits from outstanding circuit technology from Dr. Sykora and uses ultimate components.

Choose your finish
In stock
Free Shipping Ships from Melbourne
Contact us for re-stock date
Arriving 18th September
Shop in store
This order will ship via AusPost or TNT for free.

Balanced Signal Transmission

Connect your turntable either with the 5-pin mini XLR cable or standard XLR cables & profit from the balanced signal transmission. Symmetrical (also called balanced) transmissions consist of a hot and a cold (or positive/negative) signal. Both signal chains effectively carry the same musical information.

The Tube Box DS3 B can extract the final musical information out of the +/- signals and remove all noise that was potentially added along the transmission. All components including tube output and polypropylene capacitors are audiophile grade and guarantee a breathtaking sound experience.

Cartridge loading options

You can connect two turntables at the same time & easily set everything on the front plate. Input settings are stored in the memory, and ranges from 40dB up to 65dB are possible. You can perfectly match it with a wide variety of cartridges and integrate it into the rest of your hi-fi system, matching the volume levels accurately to other sources like CD players or streaming devices. 

Load impedance can be set continuously via potentiometer, allowing you to seamlessly adjust the impedance during playback and immediately assess the impact of different loading options. This is necessary to find just the right load impedance for your cartridge. 


  • Tube assembly: 2x E88CC / 6922
  • Input impedance: Stepless 10-1000 Ohms, fix 47 kOhms
  • Capacitance: 50 / 150 / 300 / 400 pF
  • Gain (+6dB using XLR Out): 40 / 45 / 50 / 55 / 60 / 65 dB
  • Output voltage typically: 500 mV/1kHz at 5mV/1kHz (at 40dB)
  • Signal-to-noise ratio: >87dBV -, A weighted
  • THD: < 0,03%
  • RIAA curve accuracy: +/- 0,5dB/20Hz - 20kHz
  • Subsonic filter: at 20Hz with 18dB/octave
  • Input: 1x 5-pin mini XLR / 1x pair XLR / 1x pair RCA phono
  • Output: 1x pair RCA, 1x pair XLR
  • Dimensions W x H x D: 206 x 70 x 194 mm
  • Weight: 1560g (without power supply)

Customer reviews