User manual BLUE MICROPHONES ROBBIE

[. . . ] OPERATOR'S MANUAL CL A S S - A D I S C R E T E M I C P R E Robbie is a Class-A discrete tube microphone and instrument preamplifier. With no ICs and only the highest-quality discrete components from input to output, Robbie is one of the quietest (-131 dB EIN @ 50) and most detailed (THD 0. 006%) tube preamps available today. It features audiophile-grade ultra low noise metal film resistors and polystyrene capacitors, and provides the user with the best of both worlds: An electronically-balanced, fully discrete input stage, tube gain stage (ECC88 twin triode), and an electronically-balanced solid-state output stage. [. . . ] Adjust Robbie's gain control until the desired level appears on the input level meter of your recording device. Hi-Z Instrument Input. This is a 1/4 high-impedance instrument level input. It is intended for direct injection (DI) of guitars, bass guitars, synths, drum machines and other equipment with an instrument level output. Any signal fed to the INSTRUMENT input will appear at the LINE output when the MIC/INST selector switch is depressed. Rear Panel The rear panel contains Robbie's power switch, power cable input, MIC input, LINE output, polarity switch, -20dB pad, MIC/LINE selector switch and phantom power switch. Power Switch Powers Robbie On or Off. Mic In The balanced XLR female jack is for connection of your microphone with a XLR microphone cable such as the Blue Kiwi, Cranberry or Blueberry. Any signal fed to the MIC input will appear at the LINE output when the MIC/INST selector switch is in its normal (out) position. OPERATIONS Line Out The balanced XLR male jack is for connection to your +4dBm balanced line-level input device with a XLR microphone cable such as the Blue Kiwi, Cranberry or Blueberry. Robbie's line output is wired pin 2 hot. Polarity (Ø) The SPST switch labeled Ø/REV reverses the signal polarity at a point immediately before the active input stage. When in its normal (out) position, the input signal passes unaffected. When depressed (in), the polarity is reversed. Pad The SPST switch labeled 0 dB/-20dB activates Robbie's pre-attenuation circuit. When in it's normal (out) position, input signal passes unaffected. When depressed (in) the input signal is attenuated by ­20dB to accommodate high-spl sources. Mic/Inst The SPST switch labeled MIC/INST determines which of Robbie's two inputs feeds the LINE output. When in its normal position (out), the input signal to the rear-panel XLR MIC input will appear at the LINE output. When depressed, (in), the input signal to the 1/4 Hi-Z front-panel input appears at the LINE output. +48V The SPST switch labeled +48V activates Robbie's phantom power circuit. Most condenser microphones require phantom power as well as some active dynamic and ribbon microphones. Check your microphone's specifications to determine whether it needs power. Though most modern microphones of various designs are fairly robust, application of phantom power to a device not designed for it could result in permanent damage. Particular care should be exercised when connecting ribbon microphones. Make sure phantom power is switched off before connecting or removing any microphone to avoid transients that could damage other components in your audio signal path. SAFETY PRECAUTIONS Ventilation Insure adequate ventilation when installing Robbie in a rack or other location. [. . . ] Blue, LLC, shall not be liable for errors contained herein or direct, indirect, special, incidental or consequential damages in conjunction with furnishing, performance or use of this material. This manual and any associated artwork, designs and design concepts are subject to copyright protection and remain the sole property of Blue, LLC. No part of this manual may be reproduced in any form without prior written permission of Blue, LLC. 5706 Corsa Avenue, Suite 102 · Westlake Village, CA 91362-4057 · www. bluemic. com [. . . ]