Pro-Ject Tube Box S2

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Innovative miniature sized phono preamplifier with tube output and high end sound!
Tube Box S2 is Pro-Ject’s very first product to feature a fully discrete circuit design without using any operational amplifiers (OpAmps). It also is the first product to come with replaceable tubes for tube rolling and sound-shaping. This gives the customer many options to pick from and alter the sound signature to his preference. Tube Box S2 will give a full and relaxed laid back sound with lush mids, just like you would expect it from a much bigger high end tube phono pre-amplifier. It offers support for both MM and MC cartridges and comes with many gain settings to be switched on the front panel. Five variable input impedance settings are available to adjust to any MM cartridge, the 47k ohms input impedance setting is fixed and suited for high output MC cartridges. The aluminium/metal casing is adapted to Pro-Ject’s DS2 line in looks and protects against vibrations and electromagnetic interferences for superior sound.


  • Tubes: 2 x ECC83 (12AX7A) Triode Output
  • Load Capacity: 50. 150, 270 and 370pF with 47k ohm settings only 10, 100, 1k, 2k ohm, typical for low output MC cartridges
  • Load Impedance: 47k ohm, typical for MM or high-output MC cartridges
  • Gain:
    • 41dB, typical for MM or high-output MC cartridges
    • 51dB or 61dB typical for low-output MC cartridges
  • Noise MM: 84dB (94dB - A weighted)
  • Noise MC: 67 dB (75 dB A-Weighted)THD MM:0.01%
  • THD MC: 0.05%
  • RIAA EQ Curve Accuracy: 20 Hz - 20 kHz / max 0.4 dB
  • Power Consumption: 18 V / 470 mA AC
  • Power Supply: Mains-fed Outboard Power Supply
  • Output Voltage: 16 V / 1000 mA AC
  • Dimensions (W x H x D): 4.1 x 3 x 5 in., 103 x 74 x 112 mm
  • Weight: 1.8 lbs., 810 g
  • Finish: Black or Silver

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