Tube Box S

£309.00
  • Improved version of the Phono Box S
  • Valve output adds more analogue warmth
  • Widely compatible with MM and MC cartridges

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S-Line

The Tube Box S from Pro-Ject Audio Systems offers un-rivalled performance, exceptional sonic ability and unique flexibility for a very competitive price. 

The dual-mono configuration, audiophile amplifier modules and polypropylene capacitors allow for a dynamic soundstage with ample detail; yet the addition of two ECC83 valves (one per-channel) adds new life and realism to the musical performance. The sturdy casework and external power supply further help to reduce the effects of outside interference, like other models in the S Line, but the Tube Box S also externalises its valves for optimal heat dissipation.

Where the Tube Box S takes another step up in ability is in its various setting adjustments. Using the dip-switches underneath the chassis (there are two sets - one for each channel), it's possible to more accurately match the turntable cartridge's technical characteristics. The dip switches allow for various Gain, Impedance and Capacitance settings. The built-in Sub-Sonic Filter further helps tailor the sound, rolling off any problematic rumble that may appear underneath 20Hz. 

The sonic quality of the Tube Box S is extremely impressive and offers a notable improvement over any other S Line phono stage, making it an audiophile upgrade for almost any mid-priced analogue hi-fi system.

Key Features:

  • Phono stage with extensive MM & MC compatibility
  • Precise RIAA equalisation 
  • Dual-mono configuration with triode output stage
  • Audiophile-grade polypropylene WIMA capacitors
  • Switchable Impedance settings  
  • Switchable Capacitance  
  • Adjustable Gain
  • Sub-Sonic Filter built-in
  • Metal casing protects against vibration and interference 

Technical Data

Valve Complement: 2x ECC83 (12AX 7A)
Input Impedance Settings: MM: 47kΩ
MC: 10Ω, 100Ω, 1KΩ or 2KΩ
Capacitance Settings: 50pF, 150pF, 270pF or 370pF
Gain Settings: 41dB, 51dB or 61dB
Noise Floor: 94dB (A Weighted) (41dB Gain)
75dB (A Weighted) (51dB & 61dB Gain)
THD: MM: <0.01%
MC: <0.05%
RIAA Accuracy: 20Hz - 20kHz / max. 0.4dB
Subsonic Filter: -12dB @ 20Hz
Input: 1x Pair RCA / Phono Sockets
Line-Level Output: 1x Pair RCA / Phono Sockets
Power Consumption: 470mA DC
Outboard PSU: 18V / 1,000mA DC (UK Plug)
Dimensions: 103 x 74 x 125mm
103 x 74 x 137mm (Incl. Sockets)
Weight: 810g

FAQ

What is a Phono Stage?

A phono stage takes the low-level electrical signal, generated by the pick-up cartridge on your turntable, and amplifies it to LINE level. When it's at LINE level, you can connect the outputs of your phono stage to any LINE or AUX input on your amplifier. If you do not have a phono stage, when you connect the turntable to your amplifier the signal will be very quiet, and if you turn it up to normal listening level it will sound distorted and noisy. 

You do not need an external phono stage if...

  • There is a phono stage already built-in to your turntable (for instance with our Phono USB or RecordMaster turntables from Pro-Ject)
  • Your amplifier has a Phono input.

In both of these cases, the built-in phono stage needs to support your pick-up cartridge (see below).


Do I need a specific type of Phono Stage?

Yes. You need to buy a phono stage that suits your particular type of cartridge. If you have a Moving Magnet (MM) cartridge, you need an MM-compatible phono stage. If you have a Moving Coil (MC) cartridge, you need an MC-compatible phono stage. This is due to the different output levels of MM and MC cartridges (as MC cartridges are so quiet, they require more Gain).


What do all of the Setting adjustments mean?

Cartridges are complex micro-mechanical devices, and the way a phono stage treats the electrical signal they generate can dramatically impact the end sound quality. When setting adjustments are available, the one adjustment you always need to check, regardless of the cartridge, is Gain. The level of Gain directly affects all cartridges, as the ultimate task of a phono stage is to amplify the electrical signal.

After Gain, the type of Settings you need to adjust are dependent on the cartridge used...

  • For Moving Magnet (MM) cartridges, you need to adjust the capacitance (measured in pF).
  • For Moving Coil (MC) cartridges, you need to adjust the Impedance (measured in Ω).

Some phono stages have other Settings available, which are not cartridge dependent. For example...

  • Curve Selection (most phono stages are designed with RIAA equalisation in mind, but there are other options available - such as DECCA)
  • Sub-Sonic Filter (to attenuate the low-end out of a system where boom is a problem)

For more help and advice visit our Tech Support section

Note: We’re constantly updating our website to ensure all our listings are as accurate as possible. However, the images and text on this page can be subject to change without notice, and errors and omissions are expected.

If you have any questions, please contact us.
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