Pro-Ject Tube Box S2 / Accu Box S2

Manufacturer Info
Ready for Audition


10 out of 10
MSRP (Pair)
Used Price (pair)

Like new.

Single original owner who took great care of all of his equipment. Now relocating to different state and smaller apartment where his old system would not fit.

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

  • Like NEW condition
  • Upgraded Mullard 12AX7 tubes
  • serial no: 17A06059
  • All original box packaging and manual included.
  • Pro-Ject Accu Box S2 ( upgraded power supply) included.

Accu Box S2 is a power supply upgrade specifically for 18V phono preamps as well as Stream Box S2 Ultra. Any compatible piece of electronics will deliver more deliver more space around instruments with improved imaging. Sonics overall are cleaner and quieter with this PSU, delivering a relaxing yet engaging listening experience. Accu Box S2 uses five cells or rechargeable Li-Pol batteries with a capacity of 2.6Ah. For protection of the batteries, overcharge, over-discharge and over-current protections are implemented. For your convenience, Accu Box S2 also offers a 5V USB A output for other components such as DACs.

  • Superlative audiophile power transmission
  • Li-Ion Accu driven power supply
  • No disturbing interferences through mains
  • Perfect for all phono electronics
  • 1 x 18V output
  • 1 x 5V USB A output
  • LED indication for charging and mains
  • Full aluminium/metal casework
  • Handmade in Europe

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