Pro-Ject Audio Systems Tube Box DS User manual
INSTRUCTIONS FOR USE
Pro-Ject Tube Box DS
© Audio Trade GmbH · Pro-Ject Tube Box DS · Revision 2013.3.1
2
Dear music lover,
thank you for purchasing a PRO-JECT AUDIO phono amplifier.
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
!
AC outlet voltages vary from country to country. Before connecting to the mains, make sure that the
voltage in your area meets the voltage requirements printed on the power supply.
The power supply is used to 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 device or 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.
Subsonic Filter
Subsonic
OFF
Subsonic
ON
Subsonic
ON OFF
Settings
Use the dip switches at the back of the unit and the rotary control at the front to set input gain, input
capacitance and input impedance. Please set both channels equally.
!
To alter settings the unit must be disconnected from the power supply and the amplifier.
Examples of typical settings
Ortofon 2M Red (MM)
input gain 40dB, input capacitance 147pF, input impedance 47kohms
40
50
220
100
dB
dB
pF
F/V
pF
Ortofon X5-MC (High-Output MC)
input gain 50dB, input capacitance 367pF, input impedance 47kohms
40
50
220
100
dB
dB
pF
F/V
pF
Ortofon Rondo Red (Low-Output MC)
input gain 60dB, input capacitance *, input impedance 10ohms.
* Input capacitance is irrelevant for low-output MC cartridges
40
50
220
100
dB
dB
pF
F/V
pF
20
50
100
200
300 400 500
600
700
800
900
1000
10
© Audio Trade GmbH · Pro-Ject Tube Box DS · Revision 2013.3.1
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Input gain
40
50
220
100
dB
dB
pF
F/V
pF
50dB 40dB
60dB
40 dB
50 dB
40
50
dB
dB
Input impedance, variable – low-output MC cartridges
* Input capacitance is irrelevant for low-output MC cartridges
Jumper on F/ V must be inserted – see drawing below
20
50
100
200
300 400 500
600
700
800
900
1000
10
40
50
220
100
dB
dB
pF
F/V
pF
F/V
Input capacitance, variable – high-output MC and MM cartridges
No jumper on F/ V – see drawing below
40
50
220
100
dB
dB
pF
F/V
pF
147pF/* 47pF/*47kohms
267pF/*
367pF/*
100 pF
220pF
220
100
pF
pF
40
50
220
100
dB
dB
pF
F/V
pF
F/V
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 (low-output MC
cartridges) 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.
© Audio Trade GmbH · Pro-Ject Tube Box DS · Revision 2013.3.1
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Connectors
18V
In
Out
Right Left
Out
In
Subsonic
OFF
ON
220 pF
100 pF
40 dB
50 dB
F/V
220 pF
100 pF
40 dB
50 dB
F/V
No jumper = 60dB
!
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 gram, disc or RIAA)
on the amplifier.
Never use any other power supply than the one supplied with the unit.
Connecting the record player
Connect the tonearm signal lead to the In of the phono amplifier. The earthing wire may be connected to the
screw terminal if you encounter hum problems when using the record player.
Connection to the amplifier
Connect the Out of the phono amplifier to a line input (such as AUX, CD, Tuner, Tape or Video) on your
amplifier.
Mains power connection
Connect the low voltage plug from the power supply to the Power 18V "socket of the phono amplifier before
connecting the power supply to the mains.
To switch on from standby or to standby
The switch on the left hand side of the front panel turns the unit on or back into standby. The blue LED above
the stand-by switch shows that the unit is switched on.
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.
© Audio Trade GmbH · Pro-Ject Tube Box DS · Revision 2013.3.1
5
Technical specifications Pro-Ject Tube Box DS
ATypical for low output MC cartridges, Btypical for MM or high output MC cartridges
* Input capacitance is irrelevant for low-output MC cartridges
Tubes: 2 x ECC83 (12AX 7A)
Input impedance, variable: stepless 10ohms - 1.000ohms A
Input capacitance/impedance: 47pF, 147pF, 267pF and 367pF */47kohms B
Input gain: 40dB and 50dB B / 60dB A
Noise floor: 93dB (A weighted)
THD: <0.1%
De-emphasis curves accuracy: 20Hz - 20kHz / max. 0,5dB
Subsonic filter: at 20Hz with 18dB/octave
Input: 1 pair RCA/phono sockets
Line-level output: 1 pair RCA/phono sockets
Outboard power supply: 18V/1.000mA DC, suitable for your country's mains supply
Power consumption: 490mA DC, <1W in standby
Dimensions W x H x D (D with sockets): 103 x 72 x 144 (156)mm
Weight: 1.100g without power supply
Service
Should you encounter a problem which you are not able to alleviate or identify despite the above information,
please contact your dealer for further advice. Only when the problem cannot be resolved there should the
unit be sent to the responsible distributor in your country.
Warranty
The manufacturer accepts no responsibility for damage caused by not adhering to these instructions
for use. Modification or change to any part of the product by unauthorized persons release the
manufacturer from any liability over and above the lawful rights of the customer.
Copyright
PRO-JECT is a Registered Trademark of H. Lichtenegger.
This guide was produced by: Audio Trade GmbH
Copyright ©2012. All rights reserved.
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.
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