Pro-Ject Tube Box II

Pro-Ject Tube Box II
Pro-Ject Tube Box II
Dear music lover,
thank you for purchasing a PRO-JECT AUDIO Tube Box MK II 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.
Setting the cartridge mode
The Phono Box must be used in either MM (moving magnet) or MC (moving coil) mode according to the
construction principle of the pickup cartridge to be used. To find out which type your cartridge is please
consult the literature accompanying your cartridge. If in doubt please consult your dealer.
A switch at the back of the Tube Box sets the correct level of amplification for the cartridge.
Before setting MM / MC mode the unit must be disconnected from the power supply and amplifier.
Subsonic filter
A switch at the back of the Tube Box activates and deactivates the subsonic filter.
Connecting the record player
Connect the tonearm signal lead to the In of the Tube Box.
Take care to connect the left and right channels correctly. The right channel is usually marked red, the left
channel black or white. The earthing wire of the tonearm lead should be connected to the earth terminal.
Connection to the amplifier
Connect the Out of the Tube Box to a line input (such as AUX, CD, Tuner, Tape or Video) on your amplifier.
Take care to connect the left and right channels correctly. The right channel is usually marked red, the left
channel black or white.
Make all connections whilst the Tube Box is disconnected from the power supply.
Do not connect the Tube Box output to a phono input (sometimes labelled gram, disc or RIAA) on the
© Audio Trade GmbH · Pro-Ject Tube Box II · Revision 6.6.06/1.7.06
Mains power connection
The Tube Box is supplied with a power supply suitable for your country's mains supply. Check the label before
connecting to ensure compliance with the mains rating in your house. Connect the low voltage plug from the
power supply to the Power ~16V socket of the Tube Box before connecting the power supply to the mains.
The blue LED on the unit's front will light up once the Tube Box is properly connected to the power supply.
Technical specifications Pro-Ject Tube Box II
Type of tubes
Gain, MM / MC
Output voltage typically, MM / MC
Input impedance, MM / MC
Noise floor, MM / MC
RIAA-equalisation curve accuracy
Subsonic filter
Power consumption
Outboard power supply
Dimensions (W x H x D)
Weight without power supply
2 x ECC83 (12AX 7A)
< 0,05 / < 0,08%
40dB / 60dB
300mV at 1kHz for 3mV (MM Input) / 0,3mV (MC input)
47kohms/120pF / 100ohms/120pF
84dB / 67dB (94dB / 75dB - IEC -A)
Max. 0,5dB/20Hz - 20kHz
at 18Hz with 18dB/octave
16V/410mA AC
16V/1.000mA AC, suitable for your country's mains supply
103 x 76 x 141mm
Potential incorrect use and fault conditions
No signal on one or both channels:
No connection between player and phono amplifier ore 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:
MM / MC Mode incorrectly set - input overloading or insufficiently amplified.
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.
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.
PRO-JECT is a Registered Trademark of H. Lichtenegger. The information was correct at the time of going to
press. The manufacturer reserves the right to make
This guide was produced by: Audio Trade GmbH
changes to the technical specification without prior
Copyright © 2005. All rights reserved.
notice as deemed necessary to uphold the ongoing
process of technical development.
© Audio Trade GmbH · Pro-Ject Tube Box II · Revision 6.6.06/1.7.06
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