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- Available starting Saturday 30 May, 2026
- Free shipping
- 1yr Manufacturer Warranty
- 5% Price Promise
Pro-Ject Tube Box S3 B Balanced MM/MC Tube Phono Preamplifier BLACK
The Pro-Ject Tube Box S3 B delivers true analog warmth with a fully discrete, tube-driven phono stage designed for serious vinyl playback. Featuring a balanced signal path and high-quality ECC83 tubes, it enhances musicality with rich tonal depth, smooth dynamics, and low-noise performance across both Moving Magnet and Moving Coil cartridges.
Its fully symmetrical design, combined with flexible loading and gain options, allows precise cartridge matching and seamless integration into high-end audio systems. With both balanced and single-ended connections, along with memory-stored settings, the Tube Box S3 B provides a refined and adaptable solution for extracting the best performance from your vinyl collection.
Features
- Tube-based phono preamplifier with warm analog sound
- Dual ECC83 (12AX7) tubes for enhanced musicality
- Compatible with both MM and MC cartridges
- Balanced 5-pin Mini XLR input for Pro-Ject turntables
- Balanced XLR and single-ended RCA outputs
- Fully symmetrical and discrete gain stage
- Selectable gain levels from 40dB to 65dB
- Multiple cartridge loading options
- Memory function for input settings
- Subsonic filter to reduce low-frequency rumble
- Low noise and low distortion design
- Compact aluminum chassis with effective shielding
Specifications
General
- Product Type: Tube phono preamplifier
- Cartridge Compatibility: MM and MC
- Tube Configuration: 2 x ECC83 (12AX7)
- Balanced Operation: Yes
- Subsonic Filter: Yes, 20Hz at 18dB/octave
- Finish: Black
Inputs & Outputs
- Inputs: 1 x 5-pin Mini XLR, 1 x pair RCA
- Outputs: 1 x pair RCA, 1 x pair XLR
Performance
- Input Impedance: 10, 50, 100, 1k, 47k ohms
- Input Capacitance: 50, 150, 300, 400 pF
- Gain: 40, 45, 60, 65 dB
- Additional Gain via XLR Output: +6dB
- Signal-to-Noise Ratio MM (40dB): 97dBV, 105dBV A-weighted
- Signal-to-Noise Ratio MC (60dB): 83dBV, 88dBV A-weighted
- THD at 1kHz: <0.005% MM, <0.01% MC
- THD at 20Hz to 20kHz: <0.1% MM, <0.03% MC
- RIAA Equalization Accuracy: <0.4dB from 20Hz to 20kHz
Power
- Power Supply: 18V / 1000mA DC
- Power Consumption: 18V / 800mA DC
- Standby Power Consumption: <0.5W
Dimensions & Weight
- Dimensions: 206 x 81 x 153 mm
- Dimensions with Sockets: 164 mm depth
- Weight: 1.01 kg
What’s in the Box
- Pro-Ject Tube Box S3 B phono preamplifier
- 2 x ECC83 (12AX7) tubes (installed)
- External power supply
- User documentation
Product Details
- Pro-Ject PJ29869966
-
Brand New : Factory Sealed
- EAN : 9120129869966
- EFLC : 16464
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Warranty
One Year Warranty
- Parts and Labour Warranty
- Canada-wide Coverage
- Pro-Ject Authorized
Returns
Easy Returns
- 30-day return window on eligible items
- Full refund issued in accordance with our return policy
About Pro-Ject
Pro-Ject focuses on sound-first products built for music and home theater listening, where clarity, balance, and real-world usability matter. We've been carrying Pro-Ject since 2016.
Explore our current Pro-Ject selection and best sellers. We offer both new and open-box items, and everything is clearly marked. Popular categories include Turntables, Product Hardware & Accessories, Phono Preamps.
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