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Project Audio PJ71658588

Project Audio Tube Phono Preamplifier - Tube Box S2 - PJ71658588

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Our Price $629.99 CAD
Sale Ends : March 31, 2025
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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 ohms 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.

A true high end solution in a much smaller package!


  • 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
Outboard power supply18 V / 1.000 mA DC, suitable for your country's mains supply
Inputje 1 Paar RCA/Cinch-Buchsen
Line-level output1 pair RCA/phono sockets
Subsonic filterat 20 Hz with 18 dB/octave
RIAA-equalisation curve accuracyAbweichung max. 0.4 dB/20 Hz - 20 kHz
THD<0.02% at 40 dB input gain <0.05% at 50 dB and 63 dB input gain
Noise floor80 dB (A weighted) at 40 dB input gain, 75dB (A weighted) at 50 dB and 63 dB input gain
Input gain40 dB, 43 dB / 50 dB, 60 dB und 63 dB
Input capacitance/impedance47pF, 147pF, 267pF, 367 pF, 487 pF and 587 pF* / 47 kohms, Together with other input impedance settings without any influence!
Input impedance10 ohms, 100 ohms, 1 kohm, 2 kohms
Tubes2 x ECC83 (12AX 7A)
Power consumption470 mA DC, <1W in standby
Dimensions W x H x D with sockets103 x 73 x 131 mm
Weight410 g without power supply

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