User manual ART TUBEMPPS

[. . . ] Project Series TUBE MP User's Manual 2 IMPORTANT SAFETY INSTRUCTION ­ READ FIRST This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure-voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read the manual. Read instructions: Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. Follow the operating instructions printed in this user manual. [. . . ] Both output jacks can be used at the same time, which is handy when you want to run to a mixer and your instrument amp in a live situation, or when connecting to a computer or recording system and locally monitoring your source. Though the two output signals are isolated they do share a common ground so care should be used to make sure that you don't create a ground loop in your system. The power connector on the rear should only be hooked up to the power supply that comes with the unit. 10 Volts AC @ 700 milliamps is required. Make sure that you specify AC and not DC. Internal circuitry converts this power to the higher voltages needed for the tube and phantom power sections. 5 CONTROLS and OPERATION: The Gain Control directly adjusts the input amplifiers giving you control over the dynamic range of your source. You get a 45dB range of control when using the XLR input and a 25dB range when using the ¼" input. Set the control counterclockwise to minimum gain when connecting the inputs. The Gain Switch gives you an additional 20dB of gain between the input stage and the tube to bring up very low-level signals and allow you to drive the tube harder. The Impedance Switch works with the balanced XLR input only. Input impedance is 4. 7k Ohms in the high position. This position should be used for most microphones and line level signals to minimize any loading effects on the source. The low position sets the input impedance to 600 Ohms. This position terminates the signal with known low impedance that can flatten and clean up the frequency response of some vintage equipment including ribbon microphones, and various transformer coupled outputs. By doing this at the input you reduce the need for added equalization and the response to percussive audio dynamics is tightened in many cases. The Filter Switch rolls off the response to signals lower than 40Hz. This helps to cut out low frequency rumble, wind noise, and all types of low frequency energy before it is amplified. When recording, this allows you to get more gain before clipping the preamp, recorder, or computer and in a live situation you get more gain before clipping your amp. The Phantom Power Switch applies +48 Volt phantom power to the XLR input jack for powering your microphone, if needed. It is slow at turning on and off and is current limited to protect sensitive microphones and reduce pops. Ideally, when connecting a microphone that requires phantom power, you should first turn down gain, next connect the microphone, next switch on the phantom power, and finally bring gain back up to the desired level. This minimizes pops in your system and stress on the microphone. [. . . ] Applied Research and Technology will, without charge, repair or replace, at its option, defective product or component parts upon prepaid delivery to the factory service department or authorized service center, accompanied by proof of purchase date in the form of a valid sales receipt. Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs. This warranty is void if the serial number is altered, defaced, or removed. A R T reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured. [. . . ]