Features

Tube Phono Preamplifier: The Tube Box DS3 B is Pro-Jects first True Balanced tube phono preamp featuring two NOS Tungsram E88CC / 6922 vacuum tubes for optimal channel separation. The Tube Box DS3 B benefits from a dual-mono circuit layout with discrete components assembled with care in Europe. Its hybrid design utilizes tubes in the input & gain stages. All electrical components (including the tube output stage) are audiophile-grade to deliver high-quality sound from your turntable & phono cartridge.

True Balanced Design: The Pro-Ject Tube Box DS3 B incorporates a true, fully balanced gain stage design that can extract the final musical information out of the audio signals, plus subtract and remove all noise that could potentially be added along the transmission. It features a fully discrete & symmetrical gain stage with balanced input and outputs for dynamic and detailed sound from your vinyl record collection.

• Fully Discrete Gain Stage: The gain stage of the new Tube Box DS3 B uses a fully discrete circuit layout composed of separate, individual electronic components and devices. The amplifier section is built out of single components and doesn't use any integrated circuits for better results when it comes to sound quality.
• Semi-Passive EQ: After treating the balanced audio signals independently, they are added back together and are processed by the semi-passive RIAA equalization stage. By keeping the gain stage fully symmetrical, the Tube Box DS3 B can optimize the signal-to-noise ratio and keep interference to a minimum. For the balanced XLR outputs, a balancing stage generates a symmetrical signal, so you benefit from balanced signal transmissions again.

Balanced & Unbalanced Connectivity: The Pro-Ject Tube Box DS3 B is outfitted with balanced (XLR) and unbalanced (RCA) connection. There is stereo unbalanced RCA input, plus a 5-pin mini XLR balanced stereo input to connect to your turntable. There is also a stereo unbalanced RCA output, as well as a XLR balanced stereo output to connect to the corresponding unbalanced or balanced line-level input of your integrated amplifier or AV receiver. By utilizing phono preamp's 5-pin mini XLR input and stereo XLR outputs, you'll enjoy the benefits of a balanced signal path.

Control Settings: The Tube Box DS3 B features various control settings to perfectly match the Tube Box DS3 B to a wide variety of phono cartridges, making sure your turntable sounds it best.

• Gain Levels: The phono preamp's gain level (40/45//50/5560/65dB) can be adjusted to match the level of your MM/MC turntable.
• Input Impedance/Capacitance: You can adjust the phono preamp's input impedance (10 to 1,000 or 47,000 Ohms) and input capacitance (50/150/300/400 pF) to the setting that best suits your turntable.
• Subsonic Filter: A switchable subsonic filter prevents your amplifier and speakers of ultra low rumble below 20Hz (-18dB).

All Metal Construction: The Tube Box DS3 B employs a steel chassis enveloped by aluminum panels. This all metal construction design offers very high rigidity and isolation against outside interferences, which is essential for phono applications. The front-panel push button controls are also made from aluminum. The Tube Box DS3 B is available in a black or silver finish.

Ground Terminal: The phono preamp also has a turntable ground, in case your turntable has a separate ground lead. This provides shielding to the tone-arm and the sensitive circuitry in the turntable.

External Power Supply: The Tube Box DS3 B is powered by an external AC adapter in order to keep all the parts which can radiate electromagnetic fields out of the amplifier range. To further ensure clean power, the included external AC power adapter uses a transformer with a very low core saturation, plus shielding between the primary and secondary windings.

Trigger In/Out: The Tube Box DS3 B offers a 12V trigger input (3.5mm) and 12V trigger output (3.5mm) so you can sync power on and off functions between the Tube Box, your AV receiver or integrated amplifier, and your turntable.