Input Impedance, Variable – Low-Output Mc Cartridges; Input Impedance, 47K - High-Output Mc And Mm Cartridges; Input Capacitance, Variable – High-Output Mc And Mm Cartridges; Examples Of Typical Settings - Pro-Ject Audio Systems Tube Box DS2 Instructions For Use

Input impedance, variable – low-output MC cartridges
* Input capacitance is irrelevant for low-output MC cartridges
The button Loading ohm must be set to Variable. Use the rotary controller to set input impedance to desired
value (10Ω-1000Ω)

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

The button Loading ohm must be set to 47k.
Input capacitance, variable – high-output MC and MM cartridges
The button Loading pF sets the capacitance to 100pF, 220pF or 320pF
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.

Examples of typical settings

Ortofon 2M Red (MM)
Ortofon X5-MC (High-Output MC)
Ortofon Rondo Red (Low-Output MC)

Technical specifications Pro-Ject Tube Box DS2

Tubes:
Input impedance :
Input capacitance :
Gain:
Output voltage typically:
Noise floor:
THD:
RIAA-equalisation curve accuracy:
Input:
Line-level output:
Outboard power supply:
Power consumption:
Dimension W x D x H (D with sockets)
Trigger output/input:
Weight (without power supply):
4
© Pro-Ject Audio Systems · Pro-Ject Tube Box DS2 · Revision 2016.9.21
2 x ECC83 (12AX 7A)
variable 10-1000 ohms/ 47.000 ohms (47kΩ)
100pF, 220pF, 320pF
40, 45, 50, 60 and 65 dB (switchable)
500 mV/1kHz at 5mV/1kHz (at 40dB)
88 dB (A weighted, at 40dB gain)
<0,04 %
20 Hz – 20 kHz / +0,2dB / -0,2dB
2 pairs RCA/phono sockets
2 pairs RCA/phono sockets
18 V/1000 mA DC
490mA DC, <0,5W in standby
206mm x 227 (239)mm x 91mm aluminium
240mm x 227 (239)mm x 93mm wood
12V (2,5mm jack)
1650g aluminium
1930g wood
 input gain 40dB,
 input capacitance 100pF,
 input impedance 47kohms
 input gain 50dB,
 input capacitance 320pF,
 input impedance 47kohms
 input gain 60dB,
 input capacitance is irrelevant,
 input impedance 10ohms.