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Pro-Ject Audio

Tube Box S2

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Product Description

Tube Box S2 is Pro-Ject's very first product to feature a fully discrete circuit design without using any operational amplifiers (OpAmps). It also is the first product to come with replaceable tubes for tube rolling and sound-shaping. This gives you many options for altering sound quality to their preference.

Tube Box S2 provides a full and relaxed sound with lush mids, just like you would expect from a much pricier tube phono pre-amplifier. It offers support for both MM and MC cartridges and comes with multiple gain settings to be switched on the front panel. Five variable input impedance settings are available to adjust to any MC cartridge, and a 47k ohm input impedance setting is fixed and suited for MM and high output MC designs. The new S2 series aluminum/metal casing protects against vibrations and electromagnetic interference for superior sound - a true high end solution in a small package!

Product Details
  • Materials
  • Measurements
    4.1"L x 5.2"W x 2.9"H
  • OriginCzechia

— Warranty: Manufacturer's 2 Years
— MM/MC Tube Phonostage With Discrete Circuitry & High-End Tube Sonics
— Suitable For MM And MC Cartridges
— Precise RIAA Equalization In Two Parts, Passive/active
— Fully Discreet Circuit Design Without OpAmps
— 2x ECC83 Tubes (replaceable)
— Front-sided Subsonic Filter Button
— Front-sided Gain Control
— Ultra Low Noise Circuitry With FET Input Stage
— Dual Mono Circuitry For Optimized Channel Separation
— Polystyrene Capacitors Used Where Possible
— Gold-plated RCA In- And Outputs
— External Power Adaptor And Multiple Internal Power Supplies
— Well-filtrated High-voltage Anode Power Supply
— Sandwich Alu/metal Casing Protects From Vibrations And Electromagnetic Interference
—Handmade In Europe

— Tubes: 2 X ECC83 (12AX 7A)
— Input Impedance: 10ohms, 100ohms, 1kohm, 2kohms A
— Input Capacitance/impedance: 47pF, 147pF, 267pF, 367pF,487pF And 587pF*/47kohms B
— Input Gain: 40dB, 43dB B ; 50dB, 53dB And 60dB, 63dB A
— Noise Floor: 80dB (A Weighted) At 40dB Input Gain 75dB (A Weighted) At 50 DB And 63dB Input Gain
— THD: <0.02% At 40dB Input Gain <0.05% At 50dB And 63dB Input Gain
— RIAA-equalisation Curve Accuracy: 20Hz – 20kHz / Max. 0.4dB
— Subsonic Filter: At 20Hz With 18dB/octave
— Input: 1 Pair RCA/phono Sockets
— Line-level Output: 1 Pair RCA/phono Sockets
— Outboard Power Supply: 18V/1.000mA DC, Suitable For Your Country’s Mains Supply
— Power Consumption: 470mA DC, <1W In Standby

— A: Typical For Low Output MC Cartridges, B: Typical For MM Cartridges Or High Output MC
— *Input Capacitance Is Irrelevant For Low Output MC Cartridges

What is the wattage output?

This is a dedicated phono preamp and outputs a line-level signal of around 1V that's then sent over to your receiver (or integrated amp) to be amplified to speaker level. To be clear, speakers cannot be connected directly to Tube Box S2 (RCA in/out only) unless they're powered speakers with an amplifier built in, in which case the speaker would also have RCA inputs.

Shipping Information
*Continental US only. Surcharges apply to HI, AK and Canada
  • Shipping Availability
    United States
  • Shipping Policy
    FREE Standard Shipping
  • Ship In
    1-2 weeks
  • Return Policy
    Final sale, not eligible for return or cancellation