Pro-Ject Tube Box DS3 B - Phono Stage

The new Pro-Ject Tube Box DS3 B Phono Stage 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.

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 Pro-Ject 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. 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.

External Power Supply

The Pro-Ject Tube Box DS3 B is powered from an external adapter. It is important to keep all the parts which can radiate electromagnetic fields out of the amplifier range. Due to legal requirements, this power supply must be a switch mode type with guaranteed stand-by mode power consumption 0.1W.

An outboard power supply with linear construction is even better, because it can offer much cleaner power. When you want to manufacture such clean and really high-end power supplies, you have to use a transformer with a very low core saturation and preferably with shielding between primary and secondary windings.

Product Features

• NEW balanced XLR in & outputs
• NEW more precise cartridge loading options
• Precise RIAA equalisation
• Ultra low noise circuitry
• MM & MC capable
• Balanced & single ended in & outputs
• Dual mono design
• Continously variable input impedance loading
• Superior low noise / low distortion
• Subsonic filter
• Aluminium casing protects against interference

Technical Specifications

• Tube Assembly: 2 x 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: >87 dBV - "A" Weighted
• THD: < 0.03%
• RIAA Curve Accuracy: +/- 0.5dB / 20Hz - 20kHz
• Subsonic Filter: at 20Hz @ 18dB/octave
• Inputs: 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 750mA DC / < 0.5 Watt Standby
• Dimensions W x H x D: 206 x 70 x 194 mm
• Weight: 1560g (Without Power Supply)

Further Information

Pro-Ject Tube Box DS3 B - User Manual

Pro-Ject Tube Box DS3 B - Product Information