PRESONUS BLUETUBE User Manual
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PRESONUS BLUETUBE User Manual

Two channel microphone / instrument tube preamplifier
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BlueTube
Two Channel Microphone / Instrument
Tube Preamplifier
User's Manual

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Summary of Contents for PRESONUS BLUETUBE

  • Page 1 BlueTube Two Channel Microphone / Instrument Tube Preamplifier User’s Manual...
  • Page 2 M I C R O P H O N E / I N S T R U M E N T T U B E P R E - A M P L I F I E R USERS MANUAL Version 1.0 2000, PreSonus Audio Electronics, Incorporated. All rights reserved.
  • Page 3 During the warranty period PreSonus shall, at its sole and absolute option, to either repair or replace, free of charge, any product that proves to be defective on inspection by PreSonus or its authorized service representative. To obtain warranty service, the purchaser must first call or write PreSonus at the address and telephone number printed below to obtain a Return Authorization Number and instructions of where to return the unit for service.

  • Page 4: Table Of Contents

    Overview Introduction Features Controls & Connections Front Panel Basic Layout Preamplifier Section Back Panel Basic Layout Operation Dynamic Microphones Phantom Powered Microphones Instrument Input Some Thoughts on Vacuum Tubes Mounting Instructions Technical Specifications...

  • Page 5: Introduction

    We believe the BlueTube to be an exceptional sounding unit and an exceptional value. Please contact us at 1-800-750-0323 with your questions or comments regarding this product.
  • Page 6 Blue Tube the ability to boost the desirable signal without increasing unwanted background noise. Phantom Power. Each channel of the BlueTube has 48V Phantom power available. When the Phantom power switch is engaged, power is supplied at a constant rate to both channels whether one or both channels are used.
  • Page 7 Tube for signal input from mic XLR or instrument ¼ inch input. Drive. Blue Tube provides Drive potentiometer on each channel for controlling the amount of signal routed to the 12AX7 vacuum tube. This feature lets you control how much saturation of the signal occurs.

  • Page 8: Front Panel Basic Layout

    2 . 1 F R O N T P A N E L B A S I C L A Y O U T Notice that the front panel of the Blue Tube is divided evenly at the +48V switch in the center of the unit. The input and controls are a mirror image of each other from left to center and from right to center.
  • Page 9 is available to each channel input of the Blue Phantom Power Tube. The 48 volts is supplied by way of the XLR connector for condenser mics and any other devices requiring continuous power through the XLR input. This power is supplied at a constant level allowing use of both inputs simultaneously.
  • Page 10 settings. This desirable effect is especially good for microphones and on an electric bass and the resulting sound is infinitely richer and sweeter. An overdriven signal can be achieved by significantly raising the level of the Drive control. This overdriven tube effect is extremely useful in providing cool guitar sounds and way cool for use with harmonicas for that authentic “Blues harp”...

  • Page 11: Back Panel Basic Layout

    2 . 4 B A C K P A N E L B A S I C L A Y O U T PIN 1 GND PIN 2 High PIN 3 Low Cable Wiring Diagram for Input and Output XLR Output XLR Connector is servo balanced and operates at +4dBu.

  • Page 12: Dynamic Microphones

    3 . 1 D Y N A M I C M I C R O P H O N E S Dynamic microphones are characterized by lower output levels. Hence, more gain is needed to amplify a dynamic microphone to operating level.

  • Page 13: Some Thoughts On Vacuum Tubes

    “microphonic”. Periodic replacement of vacuum tubes is recommended . The time between the suggested replacement varies greatly with use. If you notice a deterioration in sound quality then it’s time to change the tube. Mounting Instructions for the PreSonus Custom...
  • Page 14 Rack Rack Mount Adapter When mounting the Blue Tube In a PreSonus rack adapter with a Blue Max, the Blue tube must be mounted on the left side of the rack adapter to avoid hum being introduced into the unit by proximity to the power transformer in the Blue Max.

  • Page 15: Specifications

    8” X 5” X 1.75” Mounting Universal Rack Tray Insert Chassis Steel Front Panel Brushed Aluminum As a commitment to constant improvement, PreSonus, Inc. reserves the right to change any specification stated herein at any time in the future without notification.

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