Pro-Ject Audio Tube Box S2 Phono Preamplifier



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


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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.


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


Tubes: 2 x ECC83 (12AX 7A)
Input impedance: 10 ohms, 100 ohms, 1 kohm, 2 kohms
Input capacitance/impedance: 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
THD: <0.02% at 40 dB input gain <0.05% at 50 dB and 63 dB input gain
RIAA-equalisation 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
Outboard 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 with sockets: 103 x 73 x 131 mm
Weight: 410 g without power supply

Additional information


Black, Silver


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