Pro-Ject Tube Box S3 B Valve Phono Stage

Balanced Audio for Cleaner Playback

The “B” stands for balanced – and that’s where this phono stage shines. Using a symmetrical signal path via a 5-pin mini XLR input and balanced XLR outputs, it extracts musical detail while cancelling out noise. This design ensures a purer, more dynamic sound, typically found in far more expensive equipment.

Flexible Cartridge Matching Made Simple

With gain settings from 40dB to 65dB and ultra-low loading options like 50pF and 10 ohms, the Tube Box S3 B adapts to a wide range of MM and MC cartridges. Each input stores its own settings, allowing seamless switching between turntables. Whether you're dealing with high-capacitance cables or fine-tuning your setup, this phono stage offers precision and ease.

Specs

• nput Impedance (MM)
  47 kΩ
• Input Impedance (MC)
  Variable 10 - 1,000Ω
• Phono Stage Capacitance (MM)
  50, 150, 300 or 400 pF
• Phono Stage Equalization Options
  RIAA
• Subsonic Filter
  at 20Hz with 18dB/octave
• RIAA Accuracy (20Hz - 20kHz)
  <0.4 dB
• Valves
  2 x ECC83
• THD (MM Input)
  <0,005 %
• THD (MC Input)
  <0,01 %
• Signal To Noise Ratio (MM Input)
  40 dB
• Signal To Noise Ratio (MC Input)
  60 dB
• RCA Input(s)
  1x Pair RCA Phono Sockets
• Balanced Mini-XLR Input
  1x 5-pin Mini XLR
• Fixed Analogue Output(s)
  1 x RCA Pair, 1 x XLR Pair
• External Power Supply Rating
  18V-1000mA DC
• Maximum Power Consumption
  <0.5 W
• Additional Dimensions (W x H x D)
  With Sockets: 206 x 81 x 164 mm
• Dimensions (W x H x D)
  206 x 81 x 153 mm
• Weight
  Without Power Supply: 10.1 kg