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Summary of Contents for PRESONUS DigiTube Single-Channel Tube
- Page 1 DigiTUBE Single-Channel Tube Mic-Preamplifier with S/PDIF Output USER’S MANUAL 1.1 Copyright © 2001, PreSonus Audio Electronics, Inc. ALL RIGHTS RESERVED...
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Page 2: Table Of Contents
Overview... 1 Introduction ... 1 Features ... 2 Controls & Operation... 4 Front Panel... 4 2.1.1 Tube Preamp Section ... 4 2.1.2 Equalizer Section ... 6 Back Panel ... 9 2.2.1 Digital Section ... 9 2.2.2 Analog Section... 9 Vacuum Tubes ... 12 2.3.1 Replacing the Vacuum Tube ... -
Page 3: Overview 1
OVERVIEW 1 1.1 INTRODUCTION Thank you for purchasing the PreSonus DigiTUBE Single-Channel Tube Mic- Preamplifier with S/PDIF Output. This preamp was designed using state of the art components to deliver crystal clear audio for an indefinate period of time. We believe the DigiTUBE to be an exceptional sounding unit and an exceptional value. -
Page 4: Features
1 OVERVIEW 1.2 FEATURES The following is a summary of your DigiTUBE’s features: Dual Servo Gain Stage Your DigiTUBE contains a dual servo gain stage (no capacitors). This design provides ultra low noise performance and wide dynamic control. The DigiTUBE can boost the desirable signal without increasing unwanted background noise. - Page 5 OVERVIEW 1 Drive The DigiTUBE is provided with a DRIVE potentiometer for controlling the amount of signal routed through the 12AX7 vacuum tube. This feature lets you control how much saturation of the signal occurs. Greater levels of tube saturation give the signal greater warmth and a richer sound.
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Page 6: Controls & Operation
2 CONTROLS & OPERATION 2.1 FRONT PANEL The front panel of the DigiTUBE contains: TUBE PREAMP MIC/INSTRUMENT LINE The front panel of the DigiTUBE is divided into two sections: the tube preamp controls are located on the left hand side of the unit’s front panel and the equalizer section is on the right. - Page 7 the resulting sound possessing a ‘richer’ and ‘sweeter’ tone. If an overdriven signal is desired, this can be achieved by significantly raising the level of the DRIVE control. Overdriving the tube is especially useful for direct electric guitar sounds. Setting the DRIVE control is a matter of taste; the amount of saturation needed to achieve a desired result depends upon the resulting sound you want to hear.
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Page 8: Equalizer Section
2 CONTROLS & OPERATION Input Phantom power is available through the XLR input of the DigiTUBE. This 48V of phantom power is for condensor mics and/or any other devices that may require it via XLR inputs. PIN 1 = GND PIN 2 = + (+48V) PIN 3 = - (+48V) 2.1.2 EQUALIZER SECTION... - Page 9 or fully counter-clockwise position and continues to 5kHz in the right or fully clockwise position. This control behaves in the same manner as the LOW control with the frequency widths delineated by the knob’s markings becoming wider as the knob travels to the right or the clockwise direction. 80Hz Switch The DigiTUBE equalizer section contains a switch labeled 80Hz.
- Page 10 2 CONTROLS & OPERATION OUTPUT LEVEL (dBu) -42 -36 -30 -24 -18 -12 Metering The DigiTUBE has a 16 step LED meter to observe output level. The meter begins at -42dbu and goes to +24dbu (clip). A red LED is also provided on the front panel to indicate when the unit has power and is ready for operation.
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Page 11: Back Panel
2.2 BACK PANEL The back panel of the DigiTUBE contains: POWER 18 VAC by PreSonus Audio Electronics, Inc. The back panel of the DigiTUBE is divided into a digital and an analog section. 2.2.1 DIGITAL SECTION S/PDIF Digital Output (RCA) External Clock Input (BNC) Clock switch (44.1k and 48k) Sync switch (Internal and External) -
Page 12: Vacuum Tubes
2 CONTROLS & OPERATION 2.3 VACUUM TUBES The DigiTUBE comes supplied with a 12AX7 vacuum tube that provides excel- lent performance characteristics. We encourage owners of the DigiTUBE to try different brands of 12AX7 vacuum tubes to investigate the various performance possibilities they might provide. - Page 13 CONTROLS & OPERATION 2...
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Page 14: Technical Specifications
4 TECHNICAL SPECIFICATIONS Number of Channels ... One Performance THD + Noise (Unweighted) ...0.05% @ 0dB Tube Drive...10% @ 30dB Noise Floor ...-94dBu Signal to Noise... >90dB Power Supply Rejection ... >98dB Amplifier Type ...Dual Servo Input Connectors ... Neutrik™ Combo Input Impedance, XLR ... - Page 15 TECHNICAL SPECIFICATIONS 4 Power Supply Type ... Linear Supply Input ... 18 VAC/1000mA Power ...15 Watts Physical Weight ... 8lbs. Size ... Ω U Rack Dimensions...8” X 5” X 1.75” Mounting...Universal Rack Tray Insert Chassis ... Steel Front Panel ...Brushed Aluminum As a commitment to constant improvement, PreSonus reserves the right to change any specification stated herein at any time in the future without prior notification.
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Page 16: Presonus Limited Warranties
5 PRESONUS LIMITED WARRANTY IN THE UNITED STATES PreSonus Audio Electronics Inc. warrants this product to be free of defects in material and workmanship for a period of one year from the date of original retail purchase. This warranty is enforceable only by the original retail purchaser. To be protected by this warranty, the purchaser must complete and return the enclosed warranty card within 14 days of purchase. - Page 17 PRESONUS LIMITED WARRANTY 5 OUTSIDE OF THE UNITED STATES PreSonus Audio Electronics products are warranted only in the country where originally purchased, through the authorized PreSonus distributor in the country of original purchase, against defects in material and workmanship. The specific period of this limited warranty shall be that which is described to the original retail purchaser by the authorized PreSonus dealer or distributor at the time of purchase.
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