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PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)
PRO-JECT Tube Box S3 B. Balanced Tube Phono Preamp (MM/MC)

PRO-JECT Tube Box S3 B

Balanced tube phono preamplifier (MM/MC).

Discrete, balanced amplifier with no op-amps

Balanced connectivity: mini XLR input and XLR outputs

Two replaceable ECC83 tubes → warm mids and smooth highs

Adjustable gain: 40–65 dB

Flexible loading: 10 Ω–1 kΩ and 50–400 pF

Built-in subsonic filter (20 Hz)

Premium metal chassis, made in Europe

Colour
€599.00

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Pro-Ject Tube Box S3 B: Audiophile Tube Warmth, Balanced Design

The Tube Box S3 B is a high-end phono preamplifier that brings genuine analog warmth and refinement to your vinyl playback. Featuring a fully symmetrical and discrete gain stage, balanced 5-pin mini XLR input, and balanced XLR outputs, it elevates your phono system with clean, noise-free amplification.

Compact yet powerful, and available in silver or black finishes, this European-made preamp is designed for serious vinyl enthusiasts seeking premium performance in an elegant, sustainable design.

Key Features

Fully discrete & symmetrical gain stage – no OpAmps, for the purest signal path.

Balanced connectivity – 5-pin mini XLR input and XLR outputs.

Audiophile tube sound – replaceable ECC83 tubes deliver lush, natural mids and smooth highs.

Wide cartridge compatibility – adjustable gain from 40 dB to 65 dB, MM & MC ready.

Flexible loading options – ultra-low capacitance (50 pF) and resistance (from 10 ohms).

Memory function – each input setting stored for easy recall.

Front-panel controls – quick adjustments without interrupting playback.

Premium construction – steel & aluminium case for rigidity and interference shielding.

Made in Europe – expert craftsmanship since 1991.

Specifications

Gain: 40 / 45 / 50 / 55 / 60 / 65 dB

Input impedance: 10 ohms – 1k ohms continuously adjustable, or fixed 47 kOhms

Input capacitance: 50, 150, 300, 400 pF

Inputs: 1x 5-pin mini XLR, 1x RCA pair

Outputs: 1x RCA pair, 1x balanced XLR pair

Tubes: 2x ECC83 (replaceable)

S/N ratio: 104 dBV (MM), 85 dBV (MC)

THD: <0.001 % (MM) / <0.004 % (MC)

Subsonic filter: 20 Hz, 18 dB/octave

Power supply: 18V / 500 mA DC

Dimensions: 206 × 72 × 194 mm (W × H × D)

Weight: 1.5 kg (without power supply)

5024000056

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