Pro-Ject Tube Box S3 B

Product Summary

The Pro-Ject Tube Box S3 B is a compact tube phono stage designed for customers who want more analogue character and more system-matching flexibility than a basic entry-level phono preamp can usually offer. It is especially attractive for vinyl listeners who want the warmth and presentation of valves, but also want proper cartridge matching and balanced connection options in a neat, modern chassis.

A big part of the appeal is the way it combines tube sound with real-world adjustability. The Tube Box S3 B works with both MM and MC cartridges, with front-panel control over loading and gain so it is much easier to tailor the phono stage to your cartridge and system. The balanced mini XLR input and balanced XLR outputs also make it a strong option for customers building towards a lower-noise, more fully balanced analogue setup.

It is also designed to feel like a proper hi-fi upgrade rather than just a feature box. The fully symmetrical and discrete gain stage, aluminium chassis and tube output stage all help the Tube Box S3 B feel more serious and more refined in use. For customers wanting a compact valve phono stage with balanced capability, strong flexibility and genuine musical character, the Tube Box S3 B is an excellent choice.

Key Benefits

• Tube output stage is designed to bring greater warmth, texture and musical involvement to vinyl playback
• Works with both MM and MC cartridges, making it easier to partner with a wide range of turntables and upgrades
• Balanced input and balanced XLR outputs give you a clearer route into lower-noise analogue system building
• Front-panel loading and gain controls make cartridge matching much easier in day-to-day use
• Fully symmetrical and discrete gain stage is designed to support cleaner and more refined performance
• Switchable subsonic filter can help reduce unwanted low-frequency rumble
• Compact dimensions make it easier to fit into smaller hi-fi systems and shelves
• Aluminium casework helps shield the circuitry from outside interference
• 2 years manufacturers warranty, extended to 3 years if registered with Pro-Ject within 4 months of purchase

Technical Specifications

Phono Stage Details

• Product Type: Balanced audiophile tube phono stage
• Tube Assembly: 2 x ECC83 / 12AX7
• Compatible Cartridge Types: MM and MC
• Input Impedance: 10 / 50 / 100 / 1k / 47k ohms
• Input Capacitance: 50 / 150 / 300 / 400 pF
• Gain: 40 / 45 / 60 / 65 dB (+6 dB using XLR output)
• Signal to Noise Ratio: 97 dBV / 105 dBV A-weighted (MM), 83 dBV / 88 dBV A-weighted (MC)
• THD at 1 kHz: Less than 0.005% MM / less than 0.01% MC
• RIAA Accuracy: Less than 0.4 dB / 20 Hz - 20 kHz
• Subsonic Filter: 20 Hz at 18 dB per octave
• Inputs: 1 x 5-pin mini XLR, 1 x pair RCA phono sockets
• Outputs: 1 x pair RCA, 1 x pair XLR
• Power Supply: 18 V / 1000 mA DC
• Power Consumption: 18 V / 800 mA DC, less than 0.5 W in standby
• Colour Options: Silver or black
• Made In: Europe

Weight & Dimensions

• Dimensions: 20.6 x 8.1 x 15.3 cm (W x H x D)
• Dimensions including sockets: 20.6 x 8.1 x 16.4 cm (W x H x D)
• Weight: 1.01 kg without power supply

What’s in the Box

• Pro-Ject Tube Box S3 B phono preamplifier
• Power supply
• Product documentation