Pro-Ject Tube Box S2 phono preamplifier

MM and MC phono preamplifier

ECC83 tube phono stage

Adjustable gain

Adjustable charge and capacity

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Manufacturer : PRO-JECT

359,00 €

In stock
Shipped within 3 to 5 working days Available within 1 or 2 weeks

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After the unquestionable success of the small Pro-Ject Tube Box S phono preamplifier, the Austrian manufacturer offers a newer version of its best seller.  


At first sight, the Pro-Ject Tube Box S2 phono preamplifier is not very different from its predecessor.

However, one that has an eye for detail can immediately remark that the chassis has been changed. Indeed, the previous version had a brushed aluminium front panel (black or natural) mounted on a gray steel chassis.

Instead, the Pro-Ject Tube Box S2 phono preamplifier has an anodized chassis made out of an aluminium sandwich.  

Pro-Ject Tube Box S2 phono preamplifier

Therefore, it appears as a higher end aspect, which provides a better immunity against radio waves and electromagnetic perturbations.

PRO-JECT TUBE BOX S2 : Front panel and settings

The front panel has a power up button, as well as a button which enables to launch the subsonic filter (20hz with 12 dB/octave).

Compared to the old Tube Box S, there are 2 switches on the front panel which make it possible to select the 6 gain values (40, 43, 50, 53, 60, 63dB).

Pro-Ject Tube Box S2 phono preamplifier

A part of the gain is obtained by ECC83/12AX7 tubes (one per channel). These tubes are replaceable by multiple models of different manufacturers to modify the sound of the preamplifier according to the tastes of each individual.

Its adjustable gains, load resistance, and load capacitance values make it possible to combine this Pro-Ject Tube Box S2 with multiple high end MM and MC cartridges. Indeed, the Pro-Ject Tube Box S2 phono preamplifier is totally compatible with all MM cartridges and the majority of moving coil cartridges.

Pro-Ject Tube Box S2 phono preamplifier

On the back of the Pro-Ject Tube Box S2 phono preamplifier there are RCA inputs and outputs as well as a knob for the connexion of the mass.

PRO-JECT TUBE BOX S2 : electronic

The internal architecture is totally double mono, which makes it possible to obtain a more precise stereo reproduction and soundstage. The RIAA correction is made around a double circuit. One part is active and the other is totally passive.

The Pro-Ject Tube Box S2 phono stage is the first to be totally designed out of discrete components. Pro-Ject has not used any integrated circuits (Ops amplifiers).  

“Fet” transistors dedicated to the input circuit have been chosen for their weak noise and absence of distortion.

All the condensers are out of Styroflex technology.

No chemical capacitance was used on the audio signal path.

PRO-JECT TUBE BOX S2 : power supply

The Pro-Ject Tube Box S2 phono preamplifier is powered by an external power supply which supplies a direct current of 18 V. There is no need of a rectifying circuit or filter circuit. However, several voltages are internally treated which are regulated for the different parts of the circuit.

Pro-Ject Tube Box S2 phono preamplifier

PRO-JECT TUBE BOX S2 : Testing and listening

The opening bars of this Pro-Ject Tube Box S2 phono preamplifier are relatively significant.

Like its predecessor, there is a good timber quality and definition. But the global transparency as well as the precision of the soundstage have been largely improved.

The Pro-Ject Tube Box S2 phono preamplifier demonstrates authority with a lot of nuances and finesse when it is necessary.

There is no frustration nor any aggressiveness without any limits in the high spectrum.
In terms of timber and harmony, the tubes perfectly play their parts without adding any coloration as this is often the case on this type of device.


The installation and setting of this phono stage is simple as long as you know the characteristics of the phono cartridge.

We highly recommend to wait at least 10 minutes after the power up of the device to appreciate` its qualities.

Careful not to increase the gain too much to try to obtain the same level as a digital source as the results will be an aggressive sound and maybe even a few distortions.

The Pro-Ject Tube Box S2 phono preamplifier is currently the best seller. It is a quality product and provides the same results as devices that are worth twice as much.

This product is our top pick!


Compatibility: MM and MC

Tubes: 2 x ECC83

Load capacitance: 50, 150, 270, 370, 490, 590 pF

Load resistance: 10 ohms, 100 ohms, 1 kohm, 47 kohms

Gains: MM MC: 40, 43, 50, 53, 60, 63 dB

Signal-to-noise ratio: 80 dB

Distortion: < 0,02 % (at 40 dB), < 0,05 % (63 dB)

RIAA  equalization : 20Hz - 20kHz / max. 0,4 dB

Subsonic filter: at 20 Hz with 12 dB/octave

Input: 1 per RCA set

Output: 1 per RCA set

Power supply: separated 18v DC / 500mA

Consumption: 470 mA, < 1w in standby

Dimensions: 105 x 73 x 131

Weight: 410g without power supply

Customer reviews
(5 reviews)

Customer reviews


Tout simplement extra

Acheté en remplacement du modèle d'entrée de gamme Pro-Ject MM DC, le Tube Box S2 joue clairement dans une toute autre division. Petite frayeur au démarrage de la bête (son très étouffé sur le canal de droite), et après avoir doublement vérifié tous mes cables j'ai remarqué que le tube de droite était mal enfoncé dans son connecteur. J'ai donc du démonter les anneaux de protection pour pouvoir l'enficher correctement. Et depuis c'est le top. Son puissant et chaleureux. Je suis très satisfait. Merci à l'équipe pour les conseils et le pré-réglage ;-)



Par sa taille contenue il se loge partout, je l'ai associé avec une cellule GRADO PLATINIUM 1(Moving Iron) sur une platine AUDIO ARISTON RD 40 (platine suspendue ( ressorts ) des années 80 qui n'a pas à rougir face aux belles platines de ce site) Eh bien c'est beau!! la dynamique est remontée sans provoquer de distorsions , les registres sont bien séparés se superposent sans se bousculer , la stéréo est maintenant évidente…. les basses les médiums comme les aigus sont superbes de précision , mais ce qui est le plus évident , c'est la disparition des bruits de surface . En un mot , je ne regrette pas mon achat!! et bravo aussi pour le sérieux du personnel de ce site.



par sa taille contenue il peut se loger partout, je l'ai associé


Superbe écoute

La sortie phono de mon ampli ayant lâché, j ai profité de « l occasion » pour upgrader mon système : j ai une platine clearaudio performance DC qui marche merveilleusement (achetée chez ma platine .com) . J ai opté pour ce petit ampli phono et je ne suis pas déçu : l écoute est transformée : tout sonne mieux qu avant : et la séparation des canaux est extraordinaire : bref un grand merci à Franck pour ses conseils et à toute son équipe pour leur efficacité et leur attention : Yvon R

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Pro-Ject Tube Box S2 phono preamplifier

Pro-Ject Tube Box S2 phono preamplifier

MM and MC phono preamplifier

ECC83 tube phono stage

Adjustable gain

Adjustable charge and capacity

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