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Presonus Audio electronic Single-Channel Tube manual

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Table of contents for the manual

  • Page 1

    Copyright © 2001, PreSonus Audio Electronics, Inc. ALL RIGHTS RESERVED DigiTUBE Single-Channel T ube Mic-Preamplier with S/PDIF Output USER ’S MANUAL 1.1[...]

  • Page 2

    1 Overview .................................................................................. 1 1.1 Introduction ............................................................................... 1 1.2 F eatures .................................................................................... 2 2 Controls & Operation ...........................[...]

  • Page 3

    1 OVERVIEW 1 1.1 INTRODUCTION Thank you for purchasing the PreSonus DigiTUBE Single-Channel T ube Mic- Preamplier with S/PDIF Output. This preamp was designed using state of the art components to deliver crystal clear audio for an indenate period of time. W e believe the DigiTUBE to be an ex ceptional sounding unit and an exceptional value. P[...]

  • Page 4

    1 OVERVIEW 2 1.2 FEATURES The following is a summary of your DigiTUBE’ s features: Dual Servo Gain Stage Y our 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 unw anted background noise. Mic/Instrume[...]

  • Page 5

    3 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 y ou control how much saturation of the signal occurs. Greater lev els of tube saturation give the signal greater warmth and a richer sound. This feature works equally well on mics and i[...]

  • Page 6

    4 2 CONTROLS & OPERATION 2.1 FRONT PANEL The front panel of the DigiTUBE contains: GAIN (dB) LOW MID HIGH EQ IN MIC/INSTRUMENT LINE POWER -42 -36 -30 -24 -18 -12 -6 -3 0 3 6 9 12 15 18 24 OUTPUT LEVEL (dBu) 2k 900 5k 120 30 1k 0 -12 +12 5k 3k 15k 0 -12 +12 DRIVE TUBE PREAMP EQUALIZER 24 3 48 5 0 10 80Hz 48V PAD/ LINE -12 +12 0 FREQ LEVEL The fr[...]

  • Page 7

    Gain This control is used to determine the amount that a signal being processed by the pre-amplier is increased in level at output. Dynamic mics and instruments without pre-amps may require more gain than con- denser mics and instruments that have a built -in pre-amp (care should be taken with instruments ha ving their own built-in pre-amp not t[...]

  • Page 8

    6 2 CONTROLS & OPERATION Low The LOW control is a dual concentric potentiometer with the outer ring allowing the selected frequency to be boost or cut by as much as twelve decibels. The straight up , twelve o’clock, position is labeled zero (0). When the outer control knob is in this position, no effect is exerted on the signal, regardless of[...]

  • Page 9

    CONTROLS & OPERATION 2 7 Mid 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 straight -up noon position equal to zero or no boost or cut. The inner control knob begins at 900Hz in [...]

  • Page 10

    8 2 CONTROLS & OPERATION -42 -36 -30 -24 -18 -12 -6 -3 0 3 6 9 12 15 18 24 OUTPUT LEVEL (dBu) 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.[...]

  • Page 11

    CONTROLS & OPERATION 2 9 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) 2.2.2 ANALOG SECTION TRS Insert The ” TRS Insert connector operates at line lev el. DIGITUBE C[...]

  • Page 12

    2 CONTROLS & OPERATION 10 2.3 VACUUM TUBES The DigiTUBE comes supplied with a 12AX7 vacuum tube that pro vides excel- lent performance characteristics. W e encourage owners of the DigiTUBE to try different brands of 12AX7 v acuum tubes to investigate the various performance possibilities they might provide. 2.3.1 REPLACING THE VACUUM TUBE 1. Di[...]

  • Page 13

    CONTROLS & OPERATION 2 11[...]

  • Page 14

    12 4 TECHNICAL SPECIFICATIONS Number of Channels ............................................................................ One Performance THD + Noise (Unweighted) ......................................................0.05% @ 0dB T ube Drive ..............................................................................10% @ 30dB Noise Floor ....[...]

  • Page 15

    13 TECHNICAL SPECIFICATIONS 4 Power Supply T ype ..................................................................................... Linear Supply Input ................................................................................ 18 VAC/1000mA Power ..........................................................................................15 W[...]

  • Page 16

    14 5 PRESONUS LIMITED WARRANTY IN THE UNITED STATES PreSonus Audio Electronics Inc. warr ants 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 b y the original retail purchaser . T o be protected by this warranty , the purchaser must [...]

  • Page 17

    15 PRESONUS LIMITED WARRANTY 5 OUTSIDE OF THE UNITED STATES PreSonus Audio Electronics products are warr anted 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 specic period of this limited warr anty shall be that whic[...]