Tube Box S2 – Miniature Tube Phono Preamplifier with High-End Sound
The Tube Box S2 is an innovative compact phono preamplifier that delivers the warmth and detail of high-end tube sound in a miniature format. It features a fully discrete circuit design with no operational amplifiers (OpAmps), offering unparalleled audio purity. With two ECC83 tubes and support for both MM and MC cartridges, this unit invites users to explore tube rolling and tailor their sound. Its robust aluminium and metal construction shields it from unwanted vibrations and electromagnetic interference, ensuring a relaxed and immersive listening experience. Designed for audiophiles who want serious performance without bulky hardware, the Tube Box S2 is a class-leading solution for analog playback.
Key Features
- Compatible with both MM and MC cartridges
- Fully discrete circuit design without OpAmps
- Replaceable 2x ECC83 tubes for tube rolling
- Front-panel subsonic filter and gain control
- Five adjustable input impedance settings
- Precise passive/active RIAA equalisation
- Dual mono circuitry for excellent channel separation
- Polystyrene capacitors for improved sound fidelity
- Ultra-low noise FET input stage
- Gold-plated RCA input and output connectors
- Sandwich-style aluminium/metal case for vibration damping and shielding
- Compatible with Accu Box S2 upgrade power supply
Technical Specifications
| Specification |
Details |
| Tubes |
2 x ECC83 (12AX7A) |
| Input Impedance |
10 ohms, 100 ohms, 1 kΩ, 2 kΩ |
| Input Capacitance / Impedance |
47pF, 147pF, 267pF, 367pF, 487pF, 587pF / 47 kΩ |
| Input Gain |
40 dB, 43 dB / 50 dB, 60 dB, 63 dB |
| Noise Floor |
80 dB (A weighted) at 40 dB gain; 75 dB (A weighted) at 50/63 dB gain |
| Total Harmonic Distortion (THD) |
<0.02% at 40 dB gain; <0.05% at 50/63 dB gain |
| RIAA Equalisation Accuracy |
±0.4 dB / 20 Hz - 20 kHz |
| Subsonic Filter |
20 Hz, 18 dB/octave |
| Input |
1 pair RCA/phono sockets |
| Output |
1 pair RCA/phono sockets (line-level) |
| Power Supply |
18 V / 1000 mA DC (external), country-specific |
| Power Consumption |
470 mA DC, <1W in standby |
| Dimensions (W x H x D) |
103 x 73 x 131 mm (with sockets) |
| Weight |
410 g (without power supply) |
![Pro-ject Tube Box S2 [Tube Phono-Preamplifier] (Arrives in 21 Days)](http://www.therevolverclub.com/cdn/shop/files/Tube-Box-S2-2_1.png?v=1750761890&width=1536)
