Pro-Ject Tube Box S2 Phono Preamplifier

2-Year Local Warranty.

Any mention of "us," "we," "our," etc is by Pro-Ject, not AV One.

Tube phono-preamplifier

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

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 customers many options to pick from and alter the sound signature to their preferences. 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.

Compatible upgrade power supply: Accu Box S2

Features

• 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 optimised 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

Technical Specifications

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