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Pro-Ject Tube Box S2 Pure-Tube MM/MC Phono PreamplifierGRAMOPHONE
  • Pro-Ject Tube Box S2 Pure-Tube MM/MC Phono Preamplifier (Black)
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Pro-Ject Tube Box S2 Pure-Tube MM/MC Phono Preamplifier (Black)

4.6 out of 5 stars 386 ratings
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Purchase options and add-ons

Voltage 18 Volts
Manufacturer Pro-ject
Maximum supply voltage 18 Volts
Mounting type Surface Mount
Brand Pro-Ject
Number of channels 1
Output power 1E+1 Watts
Package type cardboard box" or "shipping box
Material Cotton

About this item

  • Innovative pioneering phono tubes in miniature format with premium sound. Suitable for MM and MC pickups
  • Very low noise circuit, complete discrete construction without op amp, polystyrene audiophile capacitors
  • 2 ECC83 tubes (interchangeable), constructed in double mono for better channel separation
  • Gold RCA inputs and outputs, front subsonic filter switch, front gain settings
  • Aluminum and metal sandwich housing protects against vibration and electromagnetic interference
› See more product details

Product details

  • Is discontinued by manufacturer ‏ : ‎ No
  • Date First Available ‏ : ‎ Nov. 25 2017
  • Manufacturer ‏ : ‎ Pro-ject
  • ASIN ‏ : ‎ B075KPB1P2
  • Item model number ‏ : ‎ Pro-Ject Tube Box S2
  • 鶹 Rank: #65,942 in Electronics (See Top 100 in Electronics)
  • Customer Reviews:
    4.6 out of 5 stars 386 ratings

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Product description

Tube Box S2 Black

Top Brand: Pro-Ject

Highly Rated
10K+ customers rate items from this brand highly
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200+ orders for this brand in past 3 months
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From the manufacturer

Innovative miniature sized phono preamplifier with tube output and high end sound!

Tube Box S2 is our very first product to feature a fully discreet 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 the customer many options to pick from and alter the sound signature to his preference. 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. It offers support for both MM and MC cartridges and comes with many gain settings to be switched on the front panel. Five variable input impedance settings are available to adjust to any MM cartridge, the 47k ohm input impedance setting is fixed and suited for high output MC cartridges. The aluminium/metal casing is adapted to our DS2 line in looks and protects against vibrations and electromagnetic interferences for superior sound.

A true high end solution in a much smaller package!

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Features

  • Suitable for MM and MC cartridges
  • Precise RIAA equalisation 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
  • Gold-plated RCA in- and outputs
  • Sandwich alu/metal casing protects from vibrations and electromagnetic interference

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Pro-Ject Audio Systems

"Our aim is to get as many people as possible into the wonderful hobby that is HiFi audio and to deliver a real stereo experience for the lowest cost possible." CEO Heinz Lichtenegger

Technical Specifications Tube Box S2

Tubes 2 x ECC83 (12AX 7A)
Input impedance 10 ohms, 100 ohms, 1 kohm, 2 kohms
Input capacitance/impedance 47pF, 147pF, 267pF, 367 pF, 487 pF and 587 pF* / 47 kohms, Together with other input impedance settings without any influence!
Input gain 40 dB, 43 dB / 50 dB, 60 dB und 63 dB
Noise floor 80 dB (A weighted) at 40 dB input gain, 75dB (A weighted) at 50 dB and 63 dB input gain
THD <0.02% at 40 dB input gain <0.05% at 50 dB and 63 dB input gain
RIAA-equalisation curve nonconformity max. 0.4 dB/20 Hz - 20 kHz
Subsonic filter at 20 Hz with 18 dB/octave
Input 1 pair RCA/Cinch sockets
Line-level output 1 pair RCA/phono sockets
Outboard power supply 18 V / 1.000 mA DC, suitable for your country's mains supply
Power consumption 470 mA DC, <1W in standby
Dimensions WxHxD with sockets 103 x 73 x 131 mm
Weight 410 g without power supply

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Customer reviews

4.6 out of 5 stars
386 global ratings

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Top reviews from Canada

  • Danny Smith
    5.0 out of 5 stars Excellent value
    Reviewed in Canada on April 7, 2025
    Verified Purchase
    Big sound in a small package sounds fantastic
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  • Martin Brault
    5.0 out of 5 stars Impressive little unit
    Reviewed in Canada on January 1, 2025
    Verified Purchase
    I was looking forward to upgrading from the built-in preamp in my Audio-Technica turntable. Wow what a difference! I can’t say enough about the improvement in sound quality. This is being used with a Nagaoka MP-110. This such a great combo. I highly recommend this tube preamp. Very well built. Feels very solid. And sounds amazing. For me well worth the price.
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  • Gary Nelson
    5.0 out of 5 stars Great sounding preamp
    Reviewed in Canada on March 5, 2021
    Verified Purchase
    This little preamp took a bit of time to dial in for my liking, mind you I did swap out the tubes for some nos amperex bugle boys. I’m using this with my project turntable T1 SB with an OM20 stylus into a Sonos port, turns out I had kept the line level source still at 10 leading to some upper range distortion on some albums (Alice in Chains mainly and some Chris Cornell) dropped my level to 7 and voila not so hot on the upper range.
    Really brings out the music, very articulate!
    3 people found this helpful
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Top reviews from other countries

Translate all reviews to English
  • Aldo
    5.0 out of 5 stars Ottimo pre phono
    Reviewed in Italy on July 22, 2023
    Verified Purchase
    Nella sua fascia di prezzo è un riferimento.
    Il pre è a stato solido, jfet selezionati. Il buffer di uscita è con valvole Electro-Harmonix rimarchiate Project.
    Il pre è silenzioso ma sensibile ai rumori indotti: metterlo sotto l'ampli valvolare era stata una idea malsana, spostarlo sul fianco lo ha zittito. Cambiato cavo, messo da 50cm di buona qualità e l'analisi fatta a 50db di gain (ascolto con una AT120e) con la scheda audio porta il rumore a -82db. Metto in conto che non sia una rilevazione precisa, un po abbondante direi, ma rispecchia i dati di targa.
    Nel mio impianto con Audio-Technica AT120e, Yaqin mc-13s con Indiana Line Tesi 661, il nano della Project rende l'ascolto del vinile davvero pimpante e con un ottima scena sonora.
    Rispetto ai pre che ho ( un t-phonum mk2, un Ifi Zen Phono e un Rega phono mm) è quello che preferisco sotto ogni punto di vista.
    Più che cambiare le valvole consiglio upgrade dell'alimentatore esterno: migliorano tutti i parametri di dinamica, dettaglio e rumore sensibilmente.
    Lo consiglio se avete in mente un budget del genere per il pre phono del vostro impianto.
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  • Thijs
    5.0 out of 5 stars Geweldig
    Reviewed in the Netherlands on June 28, 2024
    Verified Purchase
    Dit is toch echt onwaarschijnlijk goed voor het geld.
    Enorm vol en zuiver geluid, muzikaal en vol emotie.
    Ca 15 uur er op zitten bij deze review.
    Dit is alles wat ik er van hoopte dat het zou doen.
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  • Jerm Doggy Dog
    5.0 out of 5 stars Don't Think Twice, It is Exceptional.
    Reviewed in the United States on June 14, 2025
    Verified Purchase
    A month in, and I'm sure this is my preamp forever.

    Give it time, I distinctly noticed an improvement after 30-40 hours of playing. Either a break-in of the tubes, or an adjustment of my ears...I think it's both. Incidentally, the stock tubes in mine are JJ branded (Slovakia), which is probably what the Pro-Ject branded stock tubes are.
    The separation and clarity here is exceptional, each tube serves its own channel, left and right. Despite some of the chatter, there are no chips connected to the tubes.
    The gain settings are extremely useful, 43db or 50db is my sweet spot depending on what I'm listening to.

    I needed a good preamp more than I knew. Spend on your preamp like you spent on your turntable and stylus.

    I'm running a Pro-Ject Debut Carbon Esprit SB with a Marantz 1060 to some Mitsubishi DS-40 speakers (late 70s "Diatone Series"), with a Sumiko Moonstone.
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  • 鶹 Customer
    5.0 out of 5 stars Great natural warm sound!
    Reviewed in Sweden on March 6, 2025
    Verified Purchase
    Great warm sound!
    This phono amplifier improves the sound greatly, in addition to producing a warmer, more ”natural” sound it also improves detail and soundstage. Recommended!
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  • PIERRE
    5.0 out of 5 stars Top pour le prix
    Reviewed in France on May 18, 2023
    Verified Purchase
    Acheté en promo très bonne affaire. Ses différents réglages le rendent compatible avec la plus part des cellules du marché. Comparé a un préampli Rega fono mm mk3 le changement est radical. Le côté chaud des vinyles est mis en avant, testé avec cellules Ortofon blue et black sur bras SME 3009 c'est parfait, espace sonore, stéréo, clarté dynamique, détails, basses, chaleur écoute pas stressante pour les oreilles...
    Les tubes d'origine sont des JJ 12AX7 ECC83s rebadgées pro ject sont déjà très bien, ils n'ont pas la dureté des tubes chinois.
    Cependant, les JJ d'origine sont bien mais on peut mieux faire, c'est assez gras dans le bas medium mais niveau clarté, définition, ouverture stéréo etc on peut améliorer ça facilement, même si la première écoute est déjà géniale. J'ai la chance d'avoir pas mal de tubes NOS ou modernes appairés en stock, j'ai testé dans l'ordre, les JJ, sovtek 12ax7lps, tung sol ecc83, philips JAN nos 5751, RCA black plates 1958, RCA gray plates 1962, tung Sol ECC803S Gold pins, toutes sonnaient un peu différemment, les NOS RCA superbes, mais les plus simples à se procurer et les gagnantes sur les tubes modernes sont les Tung Sol Gold pins ECC803S, superbes en touts points, gain élevé, basses profondes équilibre et dynamique, détails clarté chaleur, aigus présents mais pas agressifs etc, je ne recommande pas les tun Sol ecc83s qui sont un poil plus nettes que les JJ, mais au final assez plates, et elles n'arrivent pas à la cheville des ECC803S Gold pins, attention ce sont deux tubes différents, choisissez les broches or. Pour aller plus loin j'ai remplacé l'alimentation d'origine bien médiocre par une alimentation lineaire chinoise de bonne qualité à 110euros (sur une plate-forme chinoise) et un bon cable secteur audioquest NRG-Z3, le Real Cable Kapton est moins cher et donne aussi un très bon résultat mais un peu moins chaleureux. Gain en spacialisation, profondeur, basses details douceur etc, ça dégraisse le son dans le bas médium qui devient plus net. OK, ça double le prix du tube S2, mais le résultat est là, même si a la base c'est tout a fait correct. Au prix du tube S2 on ne peut pas avoir des tubes plus chers et une super alim, même si c'est bien dommage pour l'alimentation, la seule option selon pro-ject d'améliorer l'écoute est d'acheter en option son alimentation sur batterie qui coûte aussi assez chère. Ajoutez à tout ça au moins 20 ou 30 heures de rodage et le régal sera tout proche ! Bonne écoute 😉
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