Pro-Ject Tube Box S2

MM/MC Tube Phonostage with Discrete Circuitry & High-End Tube Sonics


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.

Suitable for MM and MC cartridges

Precise RIAA equalization 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 aluminum/metal casing protects from vibrations and electromagnetic interference

Available in silver or black

Handmade in Europe

Tubes: 2 x ECC83 (12AX 7A)

Input impedance: 10ohms, 100ohms, 1kohm, 2kohms A,

Input capacitance/impedance: 47pF, 147pF, 267pF, 367pF,487pF and 587pF*/47kohms B

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
*Input capacitance is irrelevant for low output MC cartridges.

Weight: 0.41 kg

Dimensions: 13.1 × 10.3 × 7.3 cm

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