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Pro-Ject Audio
Pro-Ject Audio Tube Box S2 Amplifier
$499
Stellar right out of the box
The Tube Box S2 uses fully discrete circuitry, rather than operational amplifiers (aka Op-Amps, used in simpler, more affordable designs). 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.
Beautiful mid-range
The Tube Box S2’s sonic presentation is full & relaxed with a blossoming mid-range 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.
Product highlights
- 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
Specs
- 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
