Tube Box S3 B - Phono preamplifier
black - Pro-Ject

• Tube Box S3 B - Phono preamplifier - black - Pro-Ject

Audiophile tube sound in perfection - Pro-Ject Tube Box S3 B
The Tube Box S3 B is an audiophile phono preamplifier that combines the warm, characteristic tube sound with modern balanced signal processing. Designed for discerning vinyl lovers, it brings out the emotional depth of analog music with unprecedented clarity.
Inside, a discrete, balanced amplification stage transmits the music signal with exceptional purity. The record player can be connected directly via the balanced 5-pin mini XLR input - the XLR outputs ensure interference-free transmission to your amplifier. All important parameters can be conveniently set via the front panel. The precisely milled aluminum housing not only ensures an elegant appearance, but also reliably protects against interference. Available in silver or black and manufactured in Europe, the Tube Box S3 B stands for uncompromising sound quality and perfect craftsmanship.

"B" stands for Balanced
The Tube Box S3 B enables a fully balanced signal path that guarantees maximum signal purity. With the balanced transmission principle, the musical information is transported via a hot (+) and a cold (-) signal. Both carry identical but phase-inverted information. Interference that occurs during transmission therefore cancels each other out.
A symmetrical amplification stage then extracts only the musical content - noise or external interference is effectively eliminated. Two independent amplifier sections are installed for this double signal processing - the result is a dynamic, noise-free and authentic analog sound.

Flexible pickup settings
The Tube Box S3 B can be individually tuned to almost any MM or MC cartridge. All settings are made conveniently via the front panel - and are retained after switching off.
You can connect two turntables at the same time and flexibly select the amplification between 40 dB and 65 dB. Thanks to ultra-low values of 50 pF or 10 ohms, even demanding setups with high-capacitance cables can be perfectly adjusted. This means you always achieve the optimum level balance with other sources such as CD players or streamers.
The balanced circuit makes the decisive difference here: it gives your vinyl playback more space, depth and dynamics - and brings out every detail of your records.

Technical highlights

• New: Balanced 5-pin mini XLR input
• New: Balanced XLR outputs
• New: Balanced & discrete amplification stage
• New: Convenient front panel operation
• 2x ECC83 tubes (interchangeable)
• MM and MC compatible
• Dual mono design
• Semi-passive RIAA equalization
• Extremely low noise & low distortion
• Solid aluminum housing against electromagnetic interference
• Colors: silver or black
• Made in Europe

Technical specifications

• Parameter Value
• Input impedances 10, 50, 100, 1k, 47 kΩ
• Input capacitances 50, 150, 300, 400 pF
• Gain (+6 dB for XLR output) 40, 45, 60, 65 dB
• SNR MM (40 dB) 97 dBV / 105 dBV (A-weighted)
• SNR MC (60 dB) 83 dBV / 88 dBV (A-weighted)
• THD at 1 kHz < 0.005 % MM / < 0.01 % MC
• THD (20 Hz-20 kHz) < 0.1 % MM / < 0.03 % MC
• RIAA equalization < 0.4 dB / 20 Hz - 20 kHz
• Subsonic filter 20 Hz with 18 dB/octave
• Inputs 1× 5-pin mini XLR, 1× RCA pair
• Outputs 1× RCA pair, 1× XLR pair
• Power supply 18 V / 500 mA
• Power consumption 18 V / 800 mA DC, < 0.5 W standby
• Dimensions (W × H × D) 206 × 81 × 153 (164 with sockets) mm
• Weight 1010 g (without power supply unit)

The Tube Box S3 B is more than just a phono preamplifier - it is a sonic refinement for every vinyl setup. With genuine tube technology, symmetrical construction and precise tuning, it combines technical sophistication with musical passion. A piece of audiophile craftsmanship - developed and manufactured in Europe.