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Pro-Ject Tube Box S2

Vacuum tube phono preamplifier for moving magnet and moving coil cartridges

Item # 252TBBXS2B

The Pro-Ject Tube Box S2 offers the warm, natural, expansive sound that vacuum tube preamps are famous for.

Read more from Crutchfield writer, Eric A.

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$399.99

About the Pro-Ject Tube Box S2

Warm vacuum-tube sound for your beloved vinyl

The Pro-Ject Tube Box S2 offers the warm, natural, expansive sound that vacuum tube preamps are famous for. Not coincidentally, that's exactly the sound I want when I listen to my favorite records. And tube preamps like this one are excellent at eliminating unwanted noise, so you hear only the music.

Warm vacuum-tube sound for your beloved vinyl

The Pro-Ject Tube Box S2 offers the warm, natural, expansive sound that vacuum tube preamps are famous for. Not coincidentally, that's exactly the sound I want when I listen to my favorite records. And tube preamps like this one are excellent at eliminating unwanted noise, so you hear only the music.

This versatile preamp features adjustable input capacitance settings for moving magnet and high-output moving coil cartridges, plus gain-setting options to better match your cartridge to your system. A switchable subsonic filter protects your amplifier and speakers from power-wasting low-frequency rumble below 20 Hz.

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Product highlights:

  • dual-mono design using two dual-triode ECC83 (12AX7A) vacuum tubes for optimal channel separation
  • compatible with moving magnet and moving coil phono cartridges
  • front-panel selectable amplifier gain (40, 43, 50, 53, 60 or 63dB)
  • adjustable input capacitance and impedance via dip switches on bottom of unit
    • impedance settings: 10, 100, 1k, 2k ohms
    • fixed 47k ohm input impedance setting for high-output MC cartridges
    • capacitance settings: 147, 267, 367, 487, 587 pF
  • subsonic filter reduces low-frequency rumble and wasted amplifier power (-18dB/octave at 20 Hz)
  • audiophile-grade polypropylene capacitors
  • aluminum/metal sandwich chassis for improved shielding from vibration and electromagnetic interference
  • gold-plated RCA stereo input and output pairs
  • RIAA response accuracy: 0.4dB (20-20,000 Hz)
  • THD: less than 0.05%
  • 5-3/16"W x 4-11/16"H x 4-1/16"D
  • weight: 14.4 oz.
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # TubeBox S2-Bk
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What's in the box:

  • Tube phono-preamplifier (2 tubes installed)
  • AC power adapter (attached 4' DC cord)
  • 3 AC plug inserts (US/EU/UK)
  • Instructions For Use

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More details on the Pro-Ject Tube Box S2

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Features

Tube Phono Preamplifier: The Pro-Ject Tube Box S2 is high-quality tube preamplifier that features a fully discrete circuit design without using any operational amplifiers (OpAmps). The Tub Box S2 includes two replaceable tubes (ECC83) for tube rolling and sound-shaping. This gives the customer many options to pick from and alter the sound signature to his or her preference. It also features precise RIAA equalization, ultra-low noise circuitry, and dual-mono circuitry for optimized channel separation. The Tube Box S2 will give a full and relaxed laid back sound with lush mids, just like you would expect it from a much bigger high-end tube phono pre-amplifier.

MM & MC Cartridge Support:  The Tube Box S2 offers support for both MM and MC cartridges and comes with a variety of settings for your type of turntable and catridge.

  • Input Gain: Input Gain can be adjusted to 40dB, 43dB 50dB, 60dB, or 63dB for MM or MC cartridges. The Input Gain buttons are located on the front-panel
  • Input Capacitance Adjustment: Input Capacitance can set to 147pF, 267pF, 367pF, 487pF, and 587pF for MM cartridges. There is also a 47pF setting for high-output MC cartridges. Input Capacitance can be configured using the dip-switches on the bottom of the unit.
  • Input Impedance (for MM only): Input Impedance can be set to 10Ω, 100Ω, 470Ω, 1000Ω, or 2000Ω for MM cartridges only. Input Impedance can be configured using the dip-switches on the bottom of the unit.

Subsonic Filter: The Subsonic filter helps to reduce low-frequency rumble and wasted amplifier power. The Subsonic filter button is located on the front-panel.

Gold-Plated RCA Connections: The Pro-Ject Tube Box S2 is equipped with a pair of gold-plated RCA connections for the output stage and input stage. The gold-plated RCA connectors offer corrosion-free signal transfer.

Power Requirements: The Pro-Ject Tube Box S2 tube phono 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, 0.6A
  • Output: 18V AC, 1.0A.

Aluminum/Metal Casing: The Pro-Ject Tube Box S2's aluminum/metal casing looks protects against vibrations and electromagnetic interferences for superior sound.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
I chose this over the DS because of the ease to roll tubes (DS tubes are hard to get out) & adjust the gain for LOMC's on the front. [ Michael  Mar 10, 2019 ]

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