Pro-Ject Tube Box S2 black 3 quarter front
Pro-Ject Tube Box S2 silver 3 quarter front
Pro-Ject Tube Box S2 silver 3 quarter rear

Pro-Ject Tube Box S2 | Phono Preamp

Regular price$499.00


Pro-Ject Audio logo black

Get High Fidelity Tube Smoothness, Great Looks, and MM/MC Support with Pro-Ject VC-S3

  • Fully discrete, ultra-low noise circuitry for perfect sound reproduction
  • Dual mono designed with user replaceable ECC83 tubes
  • RIAA equalization with passive and active options
  • Handmade in Europe

Pro-Ject Tube Box S2 black on bench with walnut Debut Carbon Evo, amps and bookshelf speaker

Sound that defies expectations

Tube Box S2 uses fully discrete circuitry – no operational amplifiers here (aka Op-Amps, used in simpler, more affordable designs but with some sacrifice to sound quality). The standard, user-replaceable tubes sound stellar out of the box, though the design opens the gates for sound-shaping via tube rolling should you want to take it a step further.

Tube Box S2’s sonic presentation is full & relaxed with a blossoming midrange more typical of much more expensive designs. The stage welcomes most MM & MC cartridges on the market with a wide range of gain, loading & capacitance settings. The S2 series’ 2-layer aluminum/steel enclosure shields the circuitry from vibration and electromagnetic interference for more music, less noise.




  • Tubes: (x2) ECC83 (12AX 7A)
  • Input impedance: 10Ω, 100Ω, 1kΩ, 2kΩ A
  • Input capacitance/impedance: 47pF, 147pF, 267pF, 367pF, 487pF and 587pF/47kΩ B (Input capacitance is irrelevant for low output MC cartridges)
  • Input gain: 40dB,43dB B ; 50dB, 53dB and 60dB, 63dB A
  • Noise floor: 80dB (A weighted) at 40dB input gain 75dB (A weighted) at 50 dB and 63dB input gain
  • THD: <0.02% at 40dB input gain <0.05% at 50dB and 63dB input gain
  • RIAA-equalisation curve accuracy: 20Hz – 20kHz / max. 0.4dB
  • Subsonic filter: at 20Hz with 18dB/octave
  • Input: 1 pair RCA/phono sockets
  • Line-level output: 1 pair RCA/phono sockets
  • Outboard power supply: 18V/1.000mA DC, suitable for your country’s mains supply
  • Power consumption: 470mA DC, <1W in standby
  • A: typical for low output MC cartridges
  • B: typical for MM cartridges or high output MC

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