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  • Description

  • Specifications

  • Reviews

Tube Box DS3 B

Dual mono balanced tube phono-preamplifier

Made In Europe

High-end tube sound

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.

Cartridge loading options

You can connect two turntables at the same time & easily set everything on the front plate. Each input settings are stored in the memory. Large 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 Hifi system, matching the volume levels accurately to other sources like CD players or streaming devices. Load impedance can be set continuously via potentiometer, a system invented by Pro-Ject Audio Systems. It allows 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. No other manufacturers implement this feature in this extreme way.

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 (also called + and -) 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.

Balanced XLR

Interference free

A balanced connection can extract the final musical information, effectively filtering out any noise from interferences stemming from our noisy, modern homes.


Vacuum tubes

The E88CC tubes perform with low noise and microphonics. Enjoy the detailed low end paired with warm highs.


Continously impedance loading

Load impedance can be set continuously via potentiometer. It allows you to seamlessly adjust the impedance during playback

Made in EU

High-quality materials

The new Tube Box DS3 B is carefully designed and handmade in Europe.

Features & Specifications

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
Power supply: 18V/1000mA DC
Power consumption: max 750 mA DC / < 0,5 watt standby
Dimensions W x H x D: 206 x 70 x 194 mm
Weight: 1560g (without power supply)

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Pro-Ject Tube Box DS3 B Phono Pre-amplifier