Pro-Ject Audio Systems Tube Box II User manual

INSTRUCTIONS FOR USE

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

amplifier.

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

Tubes: 2 x ECC83 (12AX 7A)

Input impedance, MM / MC: 47kohms/120pF / 100ohms/120pF

Gain, MM / MC: 40dB / 60dB

Output voltage typically, MM / MC: 300mV at 1kHz for 3mV (MM Input) / 0,3mV (MC input)

Noise floor, MM / MC: 84dB (94dB - A weighted) / 67dB (75dB - A weighted)

THD, MM / MC: 0,05% / 0,08%

RIAA-equalisation curve accuracy: 20Hz - 20kHz / max. 0,5dB

Subsonic filter: at 18Hz with 18dB/octave

Power consumption: 16V/410mA AC

Power supply type: Mains-fed outboard power supply; suitable for your country's mains supply

Output voltage: 16V/1.000mA AC

Dimension W x H x D: 103 x 76 x 141mm

Weight: 810g without power supply

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.

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.

PRO-JECT is a Registered Trademark of H. Lichtenegger.

This guide was produced by: Audio Trade GmbH

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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