About the Pro-Ject Tube Box S
A natural-sounding phono preamp
A natural-sounding phono preamp
Pro-Ject describes the sound of the Tube Box S phono stage as "tubey," which is their way of saying that it's warm, dynamic and transparent — dependable vacuum tube qualities audiophiles have treasured for decades. And tube preamps like this one are also excellent at eliminating unwanted noise, so the music on your vinyl LPs will emerge from a quiet background.
It features adjustable input capacitance settings for moving magnet and moving coil cartridges, plus gain-setting options to match your cartridge to your system. These audio settings are available via DIP switches located on the bottom.
Product highlights:
- dual-mono design using two dual-triode ECC83 (12AX7) vacuum tubes for optimal channel separation
- compatible with moving magnet and moving coil phono cartridges
- adjustable amplifier gain, input capacitance and impedance via DIP switches on bottom of unit
- amplifier gain: 41, 51 or 61dB
- impedance settings: 10, 100, 1k, 2k ohms (MC); 47k ohms (MM)
- capacitance settings: 50, 150, 270, 370 pF
- audiophile-grade polypropylene capacitors
- RCA stereo input and output pairs
- THD: 0.01% MM; 0.05% MC
- RIAA response accuracy: 0.4dB (20-20,000 Hz)
Dimensions and warranty:
- 4-1/16"W x 2-15/16"H x 6-3/4"D
- weight: 1.78 lbs.
- warranty: 2 years
- MFR # Tube Box S-BK
What's in the box:
Pro-Ject Tube Box S owner's manual
- Turntable (MM/MC) tube pre-amplifier
- AC power adapter (with attached 5' DC cord)
- 3 AC plug inserts (US/EU/UK)
- Instructions For Use
Customer reviews for Pro-Ject Tube Box S
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Average review:
4.5 out of 5 starsThanks for submitting your review
Customer photos
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Pros:
Cons:
More details on the Pro-Ject Tube Box S
Features & specs
Features | ||
---|---|---|
Cartridge Type | MM, MC | |
Subsonic Filter | Yes | |
Cartridge Loading | --- | |
Adjustable Resistance Load | Yes | |
Adjustable Capacitance Load | Yes | |
Vacuum Tube | Yes | |
Connections | ||
RCA Inputs | 1 Pair | |
XLR Inputs | No | |
RCA Output | 1 Pair | |
XLR Output | No | |
USB Output | No | |
3.5mm Output | --- | |
Optical Output | --- | |
Coaxial Output | --- | |
Specs | ||
Signal-to-noise Ratio (MM) | 84 | |
Signal-to-noise Ratio (MC) | 67 |
Product Research
Features
Tube Phono Preamp: The Pro-Ject Audio Systems Tube Box S for MM and MC is a very high-quality phono cartridge preamplifier. It utilizes dual-mono architecture with two double triode tubes (12AX7A -ECC83) for optimum channel separation. This unit produces a lively and powerful performance with convincing sound staging and emotional presentation.
MM/MC Compatible: The Pro-Ject Tube Box S phono preamplifier offers amplifications and RIAA equalization for MM and MC cartridges. Input Gain, Capacitance, and Impedance can be adjusted from the dip-switches found on the bottom of the phono preamplifier.
- Input Gain: Input Gain can be adjusted to 41dB, 51dB and 61dB for MM or MC cartridges.
- Input Capacitance: Input Capacitance can set to 50pF, 150pF, 270pF, and 370pF for MM and MC cartridges.
- Input Impedance: Input Impedance can be set to 10, 100, 1000, and 2000 Ohm for MC cartridges only. There is also a 47000 Ohm setting for MM cartridges only.
Subsonic Filter: The Subsonic filter (-12dB/octave @ 20Hz) helps to reduce low-frequency rumble and wasted amplifier power. The Subsonic filter dip-switch is located on the bottom of the phono preamp.
Gold-Plated RCA Connections: The Pro-Ject Box S is equipped with a pair of gold-plated RCA connections for the output stage and input stage. The gold-plate RCA connectors offer corrosion-free signal transfer.
Power Requirements: The Pro-Ject Tube Box S turntable preamplifier operates off of standard household current using the included external power supply. The outboard power supply helps reduce noise and interference.
- Input: 100-240V~50/60Hz, 0.4A
- Output: 18V AC, 1.0A.
Metal Case: The phono preamplifier features a metal case that shields the electronics from vibration and electromagnetic interference.
The Pro-Ject Tube Box S replaces these items
Pro-Ject Tube Box II
- compatible with moving magnet and moving coil phono cartridges
- switchable subsonic filter to reduce low-frequency rumble and wasted amplifier power
- external power supply for reduced noise and interference
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Customer Q&A
6 questions already asked
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Replaced an old, inexpensive phono pre-amp with this one. The sound quality is outstanding. My Marantz table and speakers have never sounded better.
LarryM from Rochester, NY