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PRO-JECT Tube Box S3 B Phono Pre-Amplifier

Balanced audiophile tube phono stage

$1,149.00
Brand

Warranty Period : N/A

Audiophile tube warmth

The Tube Box S3 B is a audiophile phono preamplifier that brings true analog warmth to your vinyl playback. It features a fully symmetrical and discrete gain stage, balanced 5-pin mini XLR input, and balanced XLR outputs.

Available in silver or black and made in Europe, the Tube Box S3 B is a compact yet powerful upgrade for any serious vinyl setup.

Cartridge loading options

Large ranges from 40dB up to 65dB are possible. A fully balanced design makes all the difference here. 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. The loading options for MM and MC are designed so that the widest array of cartridges will work perfectly with the Phono Box S3 B. Ultra low values like 50 pF or 10 ohms allow you to account for special situations, for example sub-ideal higher capacitance cables. Each input settings are stored in the memory. The Tube Box S3 B always has you fully covered.

„B“ stands for balanced

The symmetrical design is the real standout feature! Connect your turntable with the 5-pin mini XLR cable & profit of the balanced signal path. Symmetrical, or also called balanced, transmissions consist of a hot and a cold (also called + and -) signal. Both signal chains effectively carry the same musical information. A true balanced gain stage can now extract the final musical information out of the +/- signals and subtract, remove, all noise that could potentially be added along the transmission. As there are two separate signal chains, we also needed two individual amplifier sections. Definitely unseen in this price range & the best and cleanest amplifier for your phono signal!

High-End Features

For the Entry-Level

Steel & aluminium casework. Fully discrete & symmetrical gain stage. Balanced in & outputs. Cartridge loading options on front panel.

True Balanced

Unleash the full power

Tube Box S3 B is ready for our new True Balanced Connection. With one of our new True Balanced phono cables and an MC cartridge you'll hear details and dynamics, previously exclusive to only the most expensive phono stages.

Handmade in EU

Since 1991

Made in Europe by technicians, engineers and designers with decades of experience. Expert craftsmanship. Sustainable products with a long lifetime. Audiophile audio performance.

Specification
GENERAL SPECIFICATIONS
Circuit Topology
  • Fully Symmetrical and Discrete Gain Stage
  • Dual-Mono Design
  • Semi-Passive RIAA Equalisation
Tube Assembly
  • 2 x ECC83 (12AX7)
  • Replaceable
Casework
  • Steel and Aluminium
Finish
  • Black
  • Silver
Power Supply
  • 18V DC / 1000mA
Power Consumption
  • 18V / 800mA DC
  • <0.5W Standby
Warranty
  • 2 Years (Electronics, Australia)
  • 90 Days (Vacuum Tubes, Australia)
CARTRIDGE AND PHONO SPECIFICATIONS
Cartridge Compatibility
  • Moving Magnet (MM)
  • Moving Coil (MC)
Input Impedance
  • 10Ω
  • 50Ω
  • 100Ω
  • 1kΩ
  • 47kΩ
Input Capacitance
  • 50pF
  • 150pF
  • 300pF
  • 400pF
Gain
  • 40dB
  • 45dB
  • 60dB
  • 65dB
  • +6dB via XLR Outputs
Signal-to-Noise Ratio
  • MM (40dB Gain): 97dBV / 105dBV (A-Weighted)
  • MC (60dB Gain): 83dBV / 88dBV (A-Weighted)
Total Harmonic Distortion
  • <0.005% MM (1kHz)
  • <0.01% MC (1kHz)
  • <0.1% MM (20Hz - 20kHz)
  • <0.03% MC (20Hz - 20kHz)
RIAA Equalisation Accuracy
  • <0.4dB (20Hz - 20kHz)
Subsonic Filter
  • 20Hz
  • 18dB/Octave
  • Switchable
ANALOGUE INPUTS
Phono Inputs
  • 1 x 5-Pin Mini XLR Balanced
  • 1 x Stereo RCA
Input Selection
  • Front-Panel Selectable
  • Cartridge Settings Stored Independently for Each Input
OUTPUTS
Line-Level Outputs
  • 1 x Stereo RCA
  • 1 x Pair XLR Balanced
  • RCA and XLR Outputs Operate Simultaneously
DIMENSIONS AND WEIGHT
Dimensions
  • 206mm Width
  • 153mm Depth
    • 164mm Depth (Including Sockets)
  • 81mm Height
Weight
  • 1.01kg