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Nilfisk-ALTO STEREO TUBE PREAMP manual

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Table of contents for the manual

  • Page 1

    MICtube STEREO TUBE PREAMP User's Manual www .altoproaudio.com V ersion 2.3 September 2005 English[...]

  • Page 2

    1 SAFETY RELA TED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death. W ARNING Describes precautions that should be observed to preven[...]

  • Page 3

    2 Do not install this product near any direct heat source. Do not block areas of ventilation. Failure to do so could result in fire. Keep product away from naked flames. IMPORT ANT SAFETY INSTRUCTIONS Read these instructions Follow all instructions Keep these instructions. Do not discard. Heed all warnings. Only use attachments/accessories specifie[...]

  • Page 4

    Preface 3 Dear Customer , . Thank you very much. L TO AUDIO TEAM Thanks for choosing L TO Stereo T ube Preamplifier and thanks for choosing one of the results of L TO AUDIO TEAM job and researches. For our L TO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say ...our obsession! We have been designing professi[...]

  • Page 5

    4 T ABLE OF CONTENT 1. INTRODUCTION ............................................................................................5 2. FEA TURE LIST ..............................................................................................5 3. CONTROL ELEMENTS .................................................................................5 3.1 [...]

  • Page 6

    1. INTRODUCTION 5 Half rack space Robust and Compact design Dual Servo Microphone Preamplifier 20dB pad +48V phantom power Phase Reverse 8-Digit Output Level meter 12AX7W A Low Noise Tubes Output section includes XLR and 1/4" connectors for driving two separate signal paths 1/4", high Z input on the front panel for instrument preamplifica[...]

  • Page 7

    6 a. Guidepost of the front panel (1) Power LED (2) CHANNEL 1 Output Level Display LED (3) CHANNEL 2 Output Level Display LED (4) Phantom Power Switch (5)(6) Phase Reverse Switch (7)(8) 20dB P AD (9)(10) Combination Microphone (XLR) and Instrument (1/4 inch) input (1 1)(13) Input Gain Control (0 to 30 dB) (12)(14) Drive Control (0 to 40 dB) b. Supp[...]

  • Page 8

    3.2 The Rear Panel 7 - Drive (12 for CHANNEL 1 and 14for CHANNEL 2): a. Power Supply Connection Please use the 18V AC AC/AC Adaptor provided by L TO to connect your MICtube. Detail your can follow the illustration. 18V AC b. Analogue Inputs / Outputs The Output XLR Connector is servo balanced and operates at +4dBu. The Output 1/4" Phone jack i[...]

  • Page 9

    4. INST ALLA TION & CONNECTION: 4.1 Mains Connection - Please ensure that the L TO MICtube Stereo Microphone Preamplifier is connected to the correct supply voltage before operating this unit. - Only use the 18V AC AC/AC Adaptor provided by L TO. 4.2 Audio onnection C a. Wiring Configuration b. In Line Connection 8 The presents with balanced XL[...]

  • Page 10

    9 4.3 Rack Mounting 5. APPLICA TIONS 5.1 The MICtube as icrophone reamplifier AM P Unbalanced Balanced Tip Ring Sleeve Tip Ring Sleeve Tip Sleeve Tip Sleeve Tip Sleeve Cent e r Cent e r Centre Screen Screen Screen 1 2 3 Tip Ring Sleeve 1 2 3 1 2 3 TIP SLEEVE TIP SLEEVE TIP RING SLEEVE TIP RING SLEEVE 1 2 3[...]

  • Page 11

    10 5.2 The MICtube as Direct-Injection ox (DI Box) AB When audio signals produced by instruments such as guitars, keyboards, etc. are transported over long unbalanced lines, the transmission quality may be affected by Hum or other interference signals included in the cable. So called DI Box are used to solve this issue: the DI Box converts the unba[...]

  • Page 12

    11 1 2 3 4 A B C D 4 3 2 1 D C B A 1 2 3 4 5 6 X1 X2 X3 2 1 3 4 2 1 3 22 11 33 B Block Diagram U1(INA163) TUBE-12AX7 2 1 3 2 3 22 33 2 1 3 1 2 3 4 5 6 X1 X2 X3 POWER SUPPL Y AC18V +12VDC +15VDC -15VDC +48VDC PHANTOM CH1 MICROPHONE INPUT CH2 OUTPUT 2 1 3 4 PHASE PHASE + P AD(20dB) CH1 MICROPHONE INPUT U2(INA163) + P AD(20dB) VOL TAGE REGULA TORUPPL [...]

  • Page 13

    12 6.2 Specifications XLR Impedance 1/4" High Z Connectors Phase Reverse 20dB Pad +48V Phantom Power XLR Balanced 1/4" Unbalanced T ube Drive Gain Power Supply Rejection Amplifier T ype THD + Noise Signal T o Noise 8-Digit LED Chassis Panel Weight Dimensions Power T ransformer Performance Meter Physical Power Supply T ype Input 5K Ohm 1M [...]

  • Page 14

    13 7. W ARRANTY 1. W ARRANTY REGISTRA TION CARD T o obtain Warranty Service, the buyer should first fill out and return the enclosed W arranty Registration Card within 10 days of the Purchase Date. All the information presented in this W arranty Registration Card gives the manufacturer a better understanding of the sales status, so as to purport a [...]

  • Page 15

    14 3.5 In no event shall be liable for any incidental or consequential damages. Some LT O states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitation may not apply to you. 3.6 This warranty gives you the specific rights, and these rights are compatible with the state laws, you may als[...]

  • Page 16

    NF00870-2.3 No. 1, Lane 17, Sec. 2, Han Shi West Road, T aichung 40151 T aiwan http://www .altoproaudio.com T el: 886-4-22313737 email: alto@altoproaudio.com Fax: 886-4-22346757 c All rights reserved to AL TO. All features and content might be changed without prior notice. Any photocopy , translation, or reproduction of part of this manual without [...]