Pro-ject Audio Tube Box DS2 User Instruction

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Pro-Ject Tube Box DS2

INSTRUCTIONS FOR USE

Dear music lover,

AC outlet voltages vary from country to country. Before connecting to the mains, make sure that the

e or

gram, disc

RIAA

Never use any other power supply than the one supplied with the unit.

IN1

IN2

OUT1

OUT2

AUX, CD, Tuner, Tape

Video

Thank you for purchasing a tube phono preamplifier from Pro-Ject Audio Systems.

In order to achieve maximum performance and reliability you should study these instructions for use carefully.

Warning of a hazard for the user, the unit or possible misuse

Important notice

Safety instructions

voltage in your area meets the voltage requirements printed on the power supply. The power supply is used to connect/disconnect the unit from the mains. Make sure that the power

supply is easily accessible at all times. Never handle the device, the power supply while your hands are wet or damp. Avoid letting liquids enter the device or the power supply. Never place any item containing liquid, such as a flower vase on or near the device. Never spill any liquid on the devic the power supply. Never place any naked flame sources, such as lighted candles on or near the device. The product shall not be used in damp or wet locations, next to a bathtub, sink, swimming pool or any other similar conditions.

Connectors

Make all connections whilst the phono amplifier is disconnected from the power supply. Do not connect the phono amplifiers output to a phono input (sometimes labelled

on the amplifier.

Connecting of record players

Connect left and right channels of the tonearm signal lead to the sockets marked amplifier. It is possible to connect 2 record players at once or connect 2 tonearms from a turntable equipped by 2 tonearms. The earthing wire(s) may be connected to the screw terminal if you encounter hum problems when using the record player.

Connection to the amplifier

Connect the output sockets marked

) on your amplifier.

of the phono amplifier to one or two line inputs (such as

of the phono

)

Mains power connection and methods to switch the unit on and off

Power 18V

before

Trigger Input.

Trigger Output

he power

Use the buttons and the rotary control at the front to control the unit. Any change of settings will be automatically stored for the chosen input, when input is changed or the unit is switched into standby mode.

Input

Output

Connect the low voltage plug from the power supply to the connecting the power supply to the mains. The unit can be switched on and off by using 2 different methods which are equal in priorities.

socket of the preamplifier

1. Using front pushbutton to switch on or into standby

The pushbutton on the front panel of the unit alternately turns the power on or returns it to standby mode. The blue LED on the front panel shows that the unit is powered on. If a trigger signal is present the unit can’t be switched off by the pushbutton.

2. Remote power on - triggers

The unit can be switched on via other Box Design components when a 12V trigger voltage is present at the

2.5mm socket marked available as accessories. The remote power-on signal can be relayed to further units via the socket. When the 12V trigger signal is switched off, the unit will also switch off.

Trigger cables may only be plugged into the sockets when the unit is disconnected from t supply and from the mains. Failure to do so may result in damage of the unit.

Special power-on cables (polarity ) in diverse lengths are

Controls

Settings

Input and Output

Tube Box DS2 has two separate inputs and outputs. The button

switches between outputs.

selects between inputs and the button

Subsonic

Loading ohm

Variable

Turn on and off subsonic filter. Any change will be automatically stored for the chosen input, when input is changed or the unit is switched into standby mode.

Gain dB

Gain for the outputs can be set from 40dB to 65dB in steps of 5dB or 10dB. Any change will be automatically stored for the chosen input, when input is changed or the unit is switched into standby mode.

Input impedance, 47k - high-output MC and MM cartridges

The button

must be set to 47k.

Input impedance, variable – low-output MC cartridges

The button input impedance to desired value (10Ω-1000Ω)

must be set to

for using rotary controller. Use the rotary controller to set

Input capacitance, variable – high-output MC and MM cartridges

pF 100, 220

320

output MC

Ortofon 2M Red

Ortofon X5-MC

Ortofon Rondo Red

- all LEDs off = 47pF.

LEDs The unit stores all the settings.

The button Loading pF sets the capacitance to 47pF, 147pF, 267pF or 367pF

* Input capacitance is irrelevant for low-output MC cartridges

To find out which type your cartridge is, please consult the literature accompanying your cartridge. The literature for cartridges should also specify the correct input impedance (lowcartridges) and the correct input capacitance (high-output MC and MM cartridges), into which the cartridge is designed to work. If in doubt please consult your dealer.

and

Examples of typical settings

(MM)

- readout always + 47pF

 input gain 40dB,  input capacitance 100pF,  input impedance 47kohms

(High-Output MC)

(Low-Output MC)

 input gain 50dB,  input capacitance 320pF,  input impedance 47kohms

 input gain 60dB,  input capacitance is irrelevant,  input impedance 10ohms.

Technical specifications Pro-Ject Tube Box DS2

The manufacturer accepts no responsibility for damage caused by not adhering to these instructions

manufacturer from any liability over and above the lawful rights of the customer.

Pro-Ject Audio Systems is a registered Trademark of

Tubes: 2 x ECC83 (12AX 7A) Input impedance : variable 10-1000 ohms/ 47.000 ohms (47kΩ) Input capacitance : 47pF, 147pF, 267pF, 367pF Gain: 40, 45, 50, 60 and 65 dB (switchable) Output voltage typically: 500 mV/1kHz at 5mV/1kHz (at 40dB) Noise floor: 88 dB (A weighted, at 40dB gain) THD: <0,04 % RIAA-equalisation curve accuracy: 20 Hz – 20 kHz / +0,2dB / -0,2dB Input: 2 pairs RCA/phono sockets Line-level output: 2 pairs RCA/phono sockets Outboard power supply: 18 V/1000 mA DC Power consumption: 490mA DC, <0,5W in standby Dimension W x D x H (D with sockets) 206mm x 227 (239)mm x 91mm aluminium 240mm x 227 (239)mm x 93mm wood Trigger output/input: 12V (2,5mm jack) Weight (without power supply): 1650g aluminium 1930g wood

Potential incorrect use and fault conditions

No signal on one or both channels: No connection between player and phono amplifier or amplifier. This could be due to a faulty plug, broken wire or solder joint or simply loose plug/socket connection.

Strong hum: No earth connection from cartridge or arm, or arm cable to phono amplifier, or earth loop.

Output too quiet or too loud, or distorted: Input gain incorrectly set - input overloading or insufficiently amplified.

Service

Should you encounter a problem which you are not able to alleviate or identify, please contact your dealer for further advice. Only if the problem cannot be resolved there, the unit should be sent to the responsible distributor in your country.

Warranty

for use. Modification or changes to any part of the product by unauthorized persons release the

Copyright, trademarks

H. Lichtenegger.

This guide was produced by: Pro-Ject Audio Systems Copyright

The information was correct at the time of going to press. The manufacturer reserves the right to make changes to the technical specification without prior notice as deemed necessary to uphold the ongoing process of technical development.