PRESONUS BLUETUBE Operation & User’s Manual
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PRESONUS BLUETUBE, PreSonus Limited Warranty 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 either repair or replace, fr
PRESONUS BLUETUBE, 1 Overview 1.1 Introduction 4 1.2 Features 4 2 Controls & Connections 2.1 Front Panel Basic Layout 7 2.2 Preamplifier Section 9 2.3 Back Panel Basic Layout 11 3 Operation 3.1 Dynamic Microphones 14 3.2 Phantom Powered Microphones 14 3.3 Instrument Input 14 3.4 Some Thoughts on Vacuum Tubes 3.5 Mounting Instructions 4 Technical 4.1 Specifications 16
PRESONUS BLUETUBE, 1.1 INTRODUCTION Thank you for purchasing the PreSonus BlueTube Two Channel Microphone / Instrument Tube Preamplifier . This pre-amp was designed using state of the art components to deliver crystal clear audio for an infinite period of time. 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. PreSonus Audio Electronics is committed to constant product improvement and b
PRESONUS BLUETUBE, the 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. This assures optimum performance of your condenser microphone(s) and that the signal will be free of distortion due to insufficient power. • Phase Reverse. A phase reverse switch
Tube for signal input from mic XLR or instrument ¼ inch input. • Drive. The Blue Tube provides a 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. Greater levels of tube saturation give the signal greater warmth and a richer sound. This works eq
PRESONUS BLUETUBE, 2.1 FRONT PANEL BASIC LAYOUT 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. Identical preamplifier sections - Channel One (left to right) and Channel Two (right to left) – comprise the front panel . Both preamp channels contain: • Combination Microphone (XLR) and Instrument (1/4 inch) input • Phase Reverse Switch • Drive Control (0 to 30dB) • -20db Pad • Gain Contro
PRESONUS BLUETUBE, Phantom Power is available to each channel input of the Blue 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. PIN 1 GND PIN 2 +48v PIN 3 +48v XLR connector wiring for Phantom Power Phase Reverse Switch allows the user to invert the polarity of the XLR connector by switching pins two and three. The inversion of the pins of the XLR connector may be necessary to alter the audio phase of two like microphones to compensate for phase cancellation. It may be required
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 authen
PRESONUS BLUETUBE, 2.4 BACK PANEL BASIC LAYOUT PIN 1 GND PIN 2 High (+) PIN 3 Low (-) Cable Wiring Diagram for Input and Output XLR The Output XLR Connector is servo balanced and operates at +4dBu. TIP High (+) SLEEVE GND (-) Cable Wiring Diagram for Input and Output ¼” Phone Plug The Output ¼” Phone Connector is unbalanced and operates at -10 dBv.
PRESONUS BLUETUBE, 3.1 DYNAMIC MICROPHONES Dynamic microphones are characterized by lower output levels. Hence, more gain is needed to amplify a dynamic microphone to operating level. Occasionally it is necessary to add the –20dB pad to the microphone to avoid distortion (e.g. when recording percussion). Do not use phantom power when using dynamic microphones. 3.2 PHANTOM POWERED MICROPHONES Phantom powered microphones such as condenser and some ribbon microphones require external power to pre-amplify the microphone acoustic pickup. Th
PRESONUS BLUETUBE, 3.4 SOME THOUGHTS ON VACUUM TUBES The Blue Tube comes supplied with a 12AX7 vacuum tube that meets or exceeds the stated performance criteria for the unit. We expect some owners of the Blue Tube will try different tubes to investigate the various performance possibilities they might provide. Tube replacement can be easily accomplished by first unplugging the unit from the electrical outlet and removing the screws which attach the top to the chassis. The tube is mounted in a transverse fashion and care should be taken to properly align the pins on the
PRESONUS BLUETUBE, 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. The Mounting of the Blue Tube to the left of the Blue Max will minimize any field effect the magnetism that the Blue Max’s transformer may have. It should be noted that proximity to computer CPU’s, power supplies, or other electrical devices may introduce undesired audio artifacts into the output signal of the Blue Tube or any microphone preamplifier. Care should be taken with where a mic pre
PRESONUS BLUETUBE, Blue Tube Technical Specifications: Number of Channels Two Performance THD + Noise(Unweighted) 0.05%@0dBTubeDrive 10%@ 30dB Tube Drive Noise Floor -94dBu Signal to Noise >90dB Power Supply Rejection >98dB Amplifier Type Dual Servo Input Connectors Neutrik Combo Input Impedance, XLR 5k Ohms Input Impedance, High Z ¼” 1Meg Ohms Output Output Impedance, XLR Balanced 51 Ohms Output Impedance, ¼”TRS Unbalanced 51 Ohms Panel Controls Tube Drive 0dB to +30dB Gain 0dB to +40dB Phase Reversal - 20dB Pad + 48V Phantom Power
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