Pro-Ject Tube Box S3 B Phono Pre-amplifier

Balanced audiophile tube phono stage

Audiophile tube warmth

The Tube Box S3 B is a audiophile phono preamplifier that brings true analog warmth to your vinyl playback. It features a fully symmetrical and discrete gain stage, balanced 5-pin mini XLR input, and balanced XLR outputs. Adjust settings easily from the front panel, and enjoy clean, interference-free performance thanks to its robust aluminium chassis. Available in silver or black and made in Europe, the Tube Box S3 B is a compact yet powerful upgrade for any serious vinyl setup.

"B" stands for balanced

The symmetrical design is the real standout feature! Connect your turntable with the 5-pin mini XLR cable & profit of the balanced signal path. Symmetrical, or also called balanced, transmissions consist of a hot and a cold (also called + and -) signal. Both signal chains effectively carry the same musical information. A true balanced gain stage can now extract the final musical information out of the +/- signals and subtract, remove, all noise that could potentially be added along the transmission. As there are two separate signal chains, we also needed two individual amplifier sections. Definitely unseen in this price range & the best and cleanest amplifier for your phono signal!

Features

• 5-pin mini XLR balanced input
• Balanced XLR outputs
• Fully symmetrical & discrete gain stage
• Easy settings adjustment on the faceplate
• 2x ECC83 tubes (replaceable)
• MM & MC capable
• Dual mono design
• Semi-passive RIAA equalisation
• Superior low noise / low distortion
• Aluminium casing protects against interference
• Available in silver or black
• Made in Europe

Technical Specifications

• Tube assembly: 2x ECC83 (12AX7)
• Input impedance: 10, 50, 100, 1k, 47k ohms
• Input capacitance: 50, 150, 300, 400 pF
• Gain (+ 6dB using XLR Out sockets): 40, 45, 60, 65 dB
• Signal / Noise ratio MM (40dB): 97dBV, 105dBV - 'A' weighted
• Signal / Noise ratio MC (60dB): 83dBV, 88dBV - 'A' weighted
• THD at 1 kHz: <0,005% MM, < 0,01% MC
• THD (20Hz-20kHz): <0,1% MM, < 0,03% MC
• RIAA-equalization curve accuracy: <0,4dB / 20Hz - 20kHz
• Subsonic filter: at 20Hz with 18dB/octave
• Input: 1x 5-pin mini XLR / 1x pair RCA phono sockets
• Line-level output: 1x pair RCA, 1x pair XLR
• Power supply DC: 18V/1000mA
• Power consumption: 18V/800mA DC, <0.5 W in standby
• Dimensions: 206 x 81 x 153 (164 with sockets) mm (W x H x D)
• Weight: 1010g without power supply