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 Pro-Ject TUBE BOX S2 

Tube phono-preamplifier MM/MC


Innovative miniature sized phono preamplifier with tube output and high end sound!


Tube Box S2 is our very first product to feature a fully discreet 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 ohm input impedance setting is fixed and suited for high output MC cartridges.


The aluminium/metal casing is adapted to our DS2 line in looks and protects against vibrations and electromagnetic interferences for superior sound.


Compatible upgrade power supply: Accu Box S2




  • Suitable for MM and MC cartridges
  • Precise RIAA equalisation in two parts, passive/active
  • Fully discreet circuit design without OpAmps
  • 2x ECC83 tubes (replaceable)
  • Front-sided Subsonic filter button
  • Front-sided Gain control
  • Ultra low noise circuitry with FET input stage
  • Dual mono circuitry for optimized channel separation
  • Polystyrene capacitors used where possible
  • Gold-plated RCA in- and outputs
  • External power adaptor and multiple internal power supplies
  • Well-filtrated high-voltage anode power supply
  • Sandwich alu/metal casing protects from vibrations and electromagnetic interference
  • Available in silver or black

Pro-Ject TUBE BOX S2

  • Tubes 2 x ECC83 (12AX 7A)
    Input impedance 10 ohms, 100 ohms, 1 kohm, 2 kohms

    Input capacitance/


    47pF, 147pF, 267pF, 367 pF, 487 pF

    and 587 pF* / 47 kohms, Together with

    other input impedance settings without

    any influence!

    Input gain 40 dB, 43 dB / 50 dB, 60 dB und 63 dB
    Noise floor

    80 dB (A weighted) at 40 dB input gain,

    75dB (A weighted) at 50 dB

    and 63 dB input gain


    <0.02% at 40 dB input gain

    <0.05% at 50 dB and 63 dB input gain


    curve accuracy

    +/- 0.4 dB/20 Hz - 20 kHz
    Subsonic filter at 20 Hz with 18 dB/octave
    Input 1 pair RCA/phono sockets
    Line-level output 1 pair RCA/phono sockets


    power supply

    18 V / 1.000 mA DC, suitable

    for your country's mains supply

    Power consumption

    470 mA DC, <1W in standby

    Dimensions W x H x D

    w/ sockets

    103 x 73 x 131 mm
    Weight 410 g without power supply
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