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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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TABLE OF CONTENTS 1 Overview..................................................................................1 1.1 Introduction ............................................................................... 1 1.2 Features .................................................................................... 2 2 Controls & Operation................................................................4 2.1 Front Panel.................................................................................
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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. Please contact us at 1-800-750-0323 with your questions or comments regard- ing this product. PreSonus Audio Electronics, Inc. is committed to constant pr
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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. Mic/Instrument/Line Input The DigiTUBE has a Neutrik™ combo (XLR & 1⁄4”) connector. The XLR input can be used for microphone signals and phantom power is available fo
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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. This feature works equally well on mics and instruments and is just what is needed to tame that ‘brittle’ sound encountered with different types of digital media. Internal Clock An internal cloc
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E R 2 CONTROLS & OPERATION 2.1 FRONT PANEL The front panel of the DigiTUBE contains: POWER OUTPUT LEVEL (dBu) -42 -36 -30 -24 -18 -12 -6 -3 0 3 6 9 12 15 18 24 TUBE PREAMP EQUALIZER 0 0 0 5 24 120 2k 5k PAD/ EQ LINE 48V 80Hz IN 0 10 3 48 30 1k 900 5k 3k 15k -12 +12 -12 +12 -12 +12 DRIVE GAIN (dB) LOW MID HIGH MIC/INSTRUMENT LINE LEVEL FREQ 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 e
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E R CONTROLS & OPERATION 2 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. Experiment! Gain This control is used to determine the a
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E R O M 2 CONTROLS & OPERATION Input Phantom power is available through the XLR input of the DigiTUBE. This 48V of phantom power is for condensor mics 1 2 and/or any other devices that may require it via XLR inputs. 3 PIN 1 = GND PIN 2 = + (+48V) PIN 3 = - (+48V) 2.1.2 EQUALIZER SECTION Low (30Hz - 1kHz) +/- 12dB Mid (900Hz - 5kHz) +/-12dB High (3kHz - 15kHz) +/-12dB 80Hz Switch EQ IN Switch Low 0 120 The LOW control is a dual concentric potentiometer with the outer ring allowing the selected
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E E R R O O M M CONTROLS & OPERATION 2 Mid 0 2k The dual concentric potentiometer labeled MID controls the frequencies from 900Hz to 5kHz. The outer ring provides boost or cut at the frequency selected by the inner knob by plus or minus twelve decibels with the 900 5k straight-up noon position equal to zero or no boost or -12 +12 cut. The inner control knob begins at 900Hz in the left or fully counter-clockwise position and continues to 5kHz in the right or fully clockwise position. This
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2 CONTROLS & OPERATION OUTPUT LEVEL (dBu) -42 -36 -30 -24 -18 -12 -6 -3 0 3 6 9 12 15 18 24 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. 8
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CONTROLS & OPERATION 2 2.2 BACK PANEL The back panel of the DigiTUBE contains: Ext. Clock Input Sleeve = GND Ring = Input POWER Tip = Output 18 VAC Clock Sync DIGITUBE Created, Designed and 48 ext. 44.1 int. Manufactured In The USA S/PDIF Insert Balanced Output 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 (Int
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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. 2.3.1 REPLACING THE VACUUM TUBE 1. Disconnect the DigiTUBE from it’s electrical outlet. 2. Remove the six screws that attach the top of the unit’s chassis. The vacuum tube is mounted in a horizo
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CONTROLS & OPERATION 2 11
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4 TECHNICAL SPECIFICATIONS Number of Channels ............................................................................ One Performance THD + Noise (Unweighted) ......................................................0.05% @ 0dB Tube Drive..............................................................................10% @ 30dB Noise Floor .....................................................................................-94dBu Signal to Noise....................................................
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TECHNICAL SPECIFICATIONS 4 Power Supply Type .....................................................................................Linear Supply Input ................................................................................18 VAC/1000mA Power ..........................................................................................15 Watts Physical Weight .............................................................................................. 8lbs. Size.............................
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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. During the warranty period PreSonus shall, at its sole and absolute option, to
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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. PreSonus does not, however, wa
