Pro-Ject Audio Systems Box Design Tube Box DS2 User manual

BY PRO-JECT AUDIO SYSTEMS
INSTRUCTIONS FOR USE
Pro-Ject Tube Box DS2

Dear music lover,
Thank you for purchasing this tube phono preamplifier from Pro-Ject Audio Systems.
In
order to achieve maximum performance and reliability you should study these instructions for use carefull y.
W Warning of a hazard for the user, the unit orpossible 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 volta ge requirements printed on the powersupply.
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 device or
the power supply. Never place any naked flame sources, such as lighled candles on or nearthe device.
The product shall not
be used in damp or wet locations, next to a bathtub, sink, swimming pool or any
othersimilar conditions.
Connectors
•
12V
ft f99" lt'911(l>'
tno'"t Output
• •
lFFl
Power
18V.::
0-<..o-0
•
(( .&
. .,.,. _
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 RIM)
on the amplifier.
Never use
any otherpowersupply than the one supplied with the unit
Connecting one or two record players
INl and IN2 allow the connection of two turntables or one turntable with 2 tonearms. By switchi ng between
INl and IN2 the individual settings are retrieved. Connect left and right channels of the tonearm signal lead to
the sockets marked INl or IN2 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 output sockets marked OUTl or OUT2 of the phono amplif i er to one or two line inputs (such as
AUX, CD, Tuner , Tape or Vldeo ) on your amplifier.
2 © Pro -Ject Audio Sys•ems · Pro-Ject Tube Box DS2 · Rev is1on 20 17.2.9

Mains power connection
Connect the low voltage plug from the power supply to the Power 1fN DC socket of the phone amplifier
before connecting the
power supply to the mains.
Remote power on -triggers
The phone amplifier can be switched on & off via a spec1al connection from other Pro-Ject products
equipped with trigger connections via the 2,5mm socket marked Trigger Input .
The remote power-on signal can be relayed to further units via the Trigger Output socket. Cables are offered
as accessory on request (polarity-~ +).
Controls
3!\.j
~X
Of:>(]
20C
\ I I
....
IQ
.......
To switch on from standby or to standby
500
/
/ 71)('
-lfl}
'""
••
.,._., ...
•.,
~·l(J ~
~~4!• .
u:~ ·· "~ ,..
. '"; .
The switch on the left hand side of the front panel tums the unit on or back into standby. The blue LED above
the stand-by switch shows that the unit
is switched on. Tube Box DS2 can be used immediately.
Settings
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 and Output
Tube Box DS2 has two separate inputs INl, IN2 and outputs OUTl, OU12. The button Input selects
between inputs and the button Output switches between outputs.
Subsonic
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.
Adapt to connected phono cartridge
The rotary control and the 3 control buttons on the right side of the front panel are used to set gain, input
impedance, input capacitance. You will find all details about construction principle and technical data in the
manual of the phone cartridge. The gain to be selected depends on the output voltage of the pickup and
also on the characteristics of downstream devices. If in doubt, consult your dealer for adv ice
© Pro-Ject
Avdio Systems Pro-Ject Tube Box DS2 Rev1sion 2017 2. 9 3

Gain dB
Gain for the outputs can be set between 40dB, 45dB, 50dB, 60d8 and 65dB in steps of 5dB or 1 OdB. Any
change will
be automatically stored for the chosen input, when input is changed or the unit is switched into
standby mode.
Input impedance, variable -low-output MC cartridges
The button Loading C must be set to Variable. Use the rotary controller to set input impedance to desired
value
(1 00-1 0000)
* Input capacitance is irrelevant for low-output MC cartridges
Input impedance, 47k- high-output MC and MM cartridges
The button Loading C must be set to 47k.
Input capacitance, variable- high-output MC and MM cartridges
The rotary control must be set to 10 0. Press Loading 0 until the LED marked by 47k lights up. The device
has a basic capacity
of 47pF, and the Load pf button can be used to increase the terminating capacity by
1 OOpF, 220pF or 320pF depending on the LED display, making the values 47pF, 147pF, 267pF or 367pf
available
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 (/ow-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.
Examples of typical settings
Ortofon 2M Red
Rotary control
lOG
(MM) Loading n 47k0hm
Gain
40dB
Loading pf lOOpF
(plus basic capacitance 47pF adds up to total of 147pf)
Ortofon MC3 Turbo
Rotary control lOG
(High-Output MC) Loading n 47k0hm
Gain
45d8
Loading pf 320pF
(plus basic capacitance 47pF adds up to total of 367pF)
Ortofon MC
Rotary control 200
Cadenza Blade
Loading n
variable
(Low-Output MC)
Gain
60d8
4
Loading pf
capacitance for Low-Output MCs is not relevant
The values given by the manufacturer for capacitance settings for MM, Ml and high-output MC-
pickups
are guideline values. Since the right setting is a/so dependent on the capacitance of the
tonearm cable
used and the inner wiring of the tonearm, experimentation with settings can be
carried out. The recommended terminating resistance for Low-Output MC cartridges is also a
guideline. The gain should
be set to the highest value, which makes distortion-free playback still
possible. You cannot destroy anything
when experimenting with the different settings. Kflalyou Iiles
bssl i6 tight/
©Pro-Ject Audio Systems· Pro-Ject Tube Box DS2 ·Revision 2017.2.9

Technical specifications Pro-Jed Tube
Box
DS2
Tubes:
2 x ECC83
(12AX
7
A)
Input impedance: variable 10-1000 ohms/ 47.000
ohms
(47k0)
Input capacitance: 47pF, 147pF, 267pF, 367pF
Gain: 40, 45, 50,
60
and 65
dB
(switchable)
Output voltage typically: 500
mV/1
kHz
at 5mV/1
kHz
(at
40dB)
Noise floor: 88
dB
(A
weighted, at 40dB gain)
THD
:
<0,04%
RIM-equalisation
curve
accuracy: 20
Hz-
20
kHz
I +0,2dB I -0,2dB
Input: 2 pairs RCNphono
sockets
Line-level
output: 2
pairs
RCNphono
sockets
Outboard power supply: 18
V/1
000
mA
DC
Power
consumption:
Dimension W x D x H
(D
with
sockets)
Trigger output/input:
Weight (without power supply):
490mA DC,
<0,5W
in standby
206mm x 227 (239)mm x
91
mm
aluminium
240mm x 227 (239)mm x 93mm wood
l2V
(2,5mm
jack)
1500g aluminium
1960g wood
© Pro-Ject Audio
Sys
tems ·
Pro
-Ject Tube Box DS2 ·Revision
2017.2.9
5

Potential incorrect use
and
fault conditions
No
signal on one
or
both channels:
No
connection between player and
phone
amplifier
or
amplifier
oThis 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
phone 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
The manufacturer accepts
no
responsibility
for
damage
caused
by
not
adhering to these instructions
for
use. Modification or changes to
any
port
of
the product
by
unauthorized persons release the
manufacturer
from
any
liability over
and
above
the lawful rights
of
the customer.
Copyright, trademarks
Pro-Ject Audio
Systems
is
a registered Trademark
of
H.
Lichtenegger.
This guide was produced by: Pro-Ject
Audio
Systems
Copyright()
2017.
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.
6 ©Pro-Ject Audio
Systems·
Pro-Ject
Tube
Box
DS2
·Revision 2017.2.9

Update: DZ / FG Datum 15.09.2016
Tube Box DS2
Tube phono-preamplifier
x Suitable for MM and MC cartridges
x Precise RIAA equalisation
x Ultra low noise circuitry
x Selection between 2 phono inputs & 2 line outputs
x Dual mono circuitry for optimized channel separation
x Selectable input impedance (for MC: fix or variable)
x Selectable input capacitance (for MM)
x Selectable subsonic filter
x Gold-plated RCA in & outputs
x Sandwich alu/metal casing protects from vibrations and elec-
tromagnetic interference
x Finishes: silver or black, with/without wooden side panels
(rosenut, walnut, eucalyptus)
PRO-JECT AUDIO SYSTEMS
a division of AUDIO TUNING GmbH
1050 Wien, Margaretenstraße 98,
Premium phono preamplifier with tube output and highend sound!
This precision tube phono preamplifier benefits from outstanding circuit technology from Dr. Sykora and uses ultimate components.
Compatible with both MM and MC cartridges. It offers connection for two turntables plus two selectable line outputs and a continuous-
ly variable selection of input impedance for low output MC cartridges while playing a record! Other features include input capacitance
for MM cartridges and switchable subsonic, that prevents your amplifier and speakers of ultra low rumble below 20Hz. All compo-
nents including tube output and polypropylene capacitors are audiophile-grade and guarantee a breathtaking sound experience.
A perfect upgrade for ambitious vinyl lovers!
Product information
09. 2016
Tube Box DS2
SRP
€ 599,00
Tube Box DS2
Wooden side panels
SRP
€ 699,00
Technical data
Tube assembly 2x ECC83 (12AX7)
Input impedance variable 10-1000 Ohms, fix 47 kOhms
Capacitance 100 / 220 / 320 pF
Gain MM / MC 40 / 45 / 50 / 60 / 65 dB
Output voltage typically 500 mV/1kHz at 5mV/1kHz (at 40dB)
Signal-to-noise ratio 88dBA
THD < 0,04%
RIAA curve accuracy +/- 0,2dB/20Hz - 20kHz
Subsonic filter 20Hz @ 18dB/octave
Input / Output 2x RCA
Power supply 18V/1000mA DC
Power consumption max 490mA DC / < 0,5 watt standby
Dimensions WHD 206 x 91 x 227 mm (aluminium)
240 x 93 x 227 mm (wood)
Weight (without power supply) 1650g (aluminium)
1930g (wood)