Pro-Ject Tube Box DS3 B Phono-Preamplifier

  • Now £799.00
  • (FREE UK Delivery)
  |   Usually dispatched within 24 hours

The Tube Boxes have been an integral part of the Pro-ject product portfolio for many years. The Tube Box DS3 B adds balanced inputs and outputs to the beloved tube amplification.

Key Specifications:

  • Balanced XLR in- & outputs
  • More precise cartridge loading options
  • Precise RIAA equalisation
  • Ultra low noise circuitry
  • MM & MC capable
  • Balanced & single-ended in- & outputs
  • Dual mono design
  • Continuously variable input impedance loading
  • Superior low noise / low distortion
  • Subsonic filter
  • Aluminium casing protects against interference
  • Available in silver or black
  • Magnetic wooden side panels available separately

Connect your turntable either with the 5-pin mini XLR cable or standard XLR cables & profit from the balanced signal transmission. Symmetrical, also called balanced, transmissions consist of a hot and a cold (also called + and -) signal. Both signal chains effectively carry the same musical information. The Tube Box DS3 B can extract the final musical information out of the +/- signals and remove all noise that was potentially added along the transmission. All components including tube output and polypropylene capacitors are audiophile-grade and guarantee a breathtaking sound experience.

Cartridge loading options

You can connect two turntables at the same time & easily set everything on the front plate. Each inputs settings are stored in the memory. Large ranges from 40dB up to 65dB are possible. You can perfectly match it with a wide variety of cartridges and integrate it into the rest of your Hifi system, matching the volume levels accurately to other sources like CD players or streaming devices. Load impedance can be set continuously via a potentiometer, a system invented by Pro-Ject Audio Systems. It allows you to seamlessly adjust the impedance during playback and immediately assess the impact of different loading options. This is necessary to find just the right load impedance for your cartridge. No other manufacturers implement this feature in this extreme way.

External power supply

The Tube Box DS3 B is powered from an external adapter. It is important to keep all the parts which can radiate electromagnetic fields out of the amplifier range. This is the reason why we use an outboard power supply. Due to legal requirements, this power supply must be a switch mode type with guaranteed stand-by mode power consumption 0,1W.

An outboard power supply with linear construction is even better, because it can offer much cleaner power. When you want to manufacture such clean and really high-end power supplies, you have to use a transformer with a very low core saturation and preferably with shielding between primary and secondary windings.

Linear power supply upgrade

Low core saturation decreases radiation of the outer electromagnetic field which can be inducted into sensitive circuitry. Shielding between windings work as a very efficient filter which effectively suppresses interference from mains. When it is combined with a DC-blocker which avoids the saturation of a core by DC current, the resulting filtration is even better. The mechanical vibration of the transformer is also reduced. It is critical that the transformer in use is also vacuum-impregnated. Obviously, such a transformer becomes larger than one would expect. Also, much more expensive. That is why such a power supply requires a cabinet the size of the Tube Box DS3 B itself.

The location of the power supply shouldn’t be close to Tube Box DS3 B. Additionally, it also shouldn’t be exposed to big transformers in power amplifiers or other appliances which can cause electromagnetic interference either. Strong electromagnetic fields from big transformers in very close proximity can even penetrate the heavy metal/aluminium chassis of the Tube Box DS3 B. Even a chassis like this has its limits! The best arrangement is to keep it as far away as possible from those harmful electromagnetic fields. The Pro-ject Power Box DS2 Sources is another step up for your Tube Box DS3 B‘s performance.

Phono Preamplifier Specifications:
Tube Assembly 2x ECC83 (12AX7)
Audio Inputs 1x 5-pin mini XLR / 1x pair XLR / 1x pair RCA phono
Audio Outputs 1x pair RCA, 1x pair XLR
THD + N < 0.04%
Signal-to-Noise Ratio 88dBA
Gain +6dB using XLR Out: 40 / 45 / 50 / 55 / 60 / 65 dB
RIAA Accuracy +/- 0.2dB/20Hz - 20kHz
MM Input impedance stepless 10-1000 Ohms, fix 47 kOhms
MC Input impedance stepless 10-1000 Ohms, fix 47 kOhms
Operating Voltage 500 mV/1kHz at 5mV/1kHz (at 40dB)
Mains Supply 18V/1000mA DC
Power consumption max 490mA DC / < 0,5 watt standby
Dimensions (HxWxD) 91 x 206 x 227mm
Weight 1.5kg

We endeavour to despatch same day for orders placed up to 3pm on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is received. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail 24 or special delivery. Larger items are delivered using a courier service such as DPD or UPS. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties can apply for shipments to any countries outside of the UK depending on where the product you have bought is made. Customers are responsible for all taxes and duties incurred when the items enter their country.

COLLECT IN STORE OR HOME INSTALL:At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock.