User's Manual
MINI-TUBE
MONO TUBE PREAMP
www.altoproaudio.com
Version 1.0 August 2004
LTO
R
English
Page 1: ...User s Manual MINI TUBE MONO TUBE PREAMP www altoproaudio com Version 1 0 August 2004 LTO R English ...
Page 2: ...ce from a registered electrician Within the product are areas where high voltages may present To reduce the risk of electric shock do not remove any covers unless the AC mains power cord is removed Covers should be removed by qualified service personnel only No user serviceable parts inside Describes precautions that should be observed to prevent the possibility of death or injury to the user Desc...
Page 3: ...d for your safety Do not remove Ground connections If the plug does not fit your AC outlet seek advice from a qualified electrician Protect the power cord and plug from any physical stress to avoid risk of electric shock Do not place heavy objects on the power cord This could cause electric shock or fire Cleaning When required either blow off dust from the product or use a dry cloth Do not use any...
Page 4: ...ity of our job we would like to share with you our work and our dreams pay attention to your suggestions and your comments Following this idea we create our products and we will create the new ones From our side we guar antee you and we will supply you also in future the best quality and the best fruits of our continuous researches and the best prices Our Mini Tube Mono Preamplifier is the result ...
Page 5: ... b Analogue Inputs Outputs 4 INSTALLATION CONNECTION 8 5 APPLICATIONS 9 5 1 The Mini Tube as icrophone reamplifier A M P 5 2 The Mini Tube as Direct Injection ox DI Box A B 5 3 The as evel ranslator A L T Mini Tube 6 TECHNICAL SPECIFICATIONS 11 6 1 Block Diagram 6 2 Specifications 7 WARRANTY 13 4 1 Mains Connection 4 2 Audio Connection a Wiring Configuration b In Line Connection 4 3 Rack Mounting ...
Page 6: ...ifier which is based on many years of experience and findings in amplifier technology and is used through the world in renowned studios sound reinforcement systems as well as in broadcast and television studios The LTO Mini Tube meets highest and no compromise requirements in terms of operation sound specifications and workmanship The LTO Mini Tube is a half rack space unit the heart of the MINI T...
Page 7: ...ou activate this switch to supply the 48V phantom power Read the operating instructions accompanying the microphone Some condenser mics might need another type of power supply old dynamic microphones could be damaged by the 48V voltage and unbalanced microphones should never be operated in combination with a 48V power supply This Phase Reverse Switch reverses the audio signal s phase by 180 Normal...
Page 8: ...t have a built in preamp If you should require more signal out of the preamp for a hotter recording level cranking up the gain should provide all the signal that you ll need The effect achieved by this control can be subtle to extreme depending on the settings being used A warming up of the sound can be noticed at lower settings This desirable effect is especially good for microphones and on an el...
Page 9: ...Either the 1 4 TRS Tip Ring Sleeve phone jack or the XLR servo connector can be wired in balanced and unbalanced modes which will be determined by the actual application status Please wire your systems as the following examples For 1 4 Phone jack For XLR connector XLR Type alanced B XLR Type Unbalanced Pin3 Pin2 Pin1 Linked to Pin1 manually Pin1 Pin2 Pin3 TRS Type Balanced Tip Ring Sleeve TRS Type...
Page 10: ...onforms to single space mounting and up to two Mini Tube Preamplifier may be mounted side by side in a standard universal EIA 19 equipment rack It is the basic application for Mini Tube Before you can use the LTO as a Mono Microphone Preamplifier Mini Tube we recommend that you study the various functions of the unit first The high gain factors 30dB provided by the microphone preamplifier can prod...
Page 11: ...operated with a nominal level of 10dBV while the level used in studios and other professional application is 0dBu or 4dBu So when you connect devices of both types to each other you should consider some kind of level translators of course The LTO Mono Microphone Preamplifier is pretty suited for this application Mini Tube The Input Gain control allows you to raise or lower your input signal level ...
Page 12: ...11 1 2 3 4 A B C D 4 3 2 1 D C B A Block Diagram 6 TECHNICAL SPECIFICATIONS 6 1 Block Diagram 2 4 2 ...
Page 13: ... Output Impedance Hight Phase Reversal 20dB Pad Tube Drive Gain VU Meter Clip Led 48V Phantom Power Metering 0 05 GAIN 0dBu A Weighting 22dBu 108dBu 88dBu 2dBu XLR and 1 4 1Meg Ohms 1 3K Ohms 51 Ohms 51 Ohms 0dB 20dB 20dBu 5dBu 20dBu Panel Controls 20Hz 50KHz 2dB one 0dB 40dB Power Supply Input 18VAC 1000mA Power 12WATT Physical Weight 0 7Kg Size 1U Rack Dimension W D H 210mm 93mm 44mm XLR Balance...
Page 14: ...Terms and conditions a warrants that this product will be free from any defects in materials and or LTO workmanship for a period of 1 year from the purchase date if you have completed the Warranty Registration Card in time c During the warranty service may repair or replace this product at its own LTO option at no charge to you for parts or for labor in accordance with the right side of this limit...
Page 15: ...llow the exclusion or limitation of incidental or consequential damages so the above exclusion or limitation may not apply to you f This warranty gives you the specific rights and these rights are compatible with the state laws you may also have other statutory rights that may vary from state to state ...
Page 16: ...w altoproaudio com Tel 886 4 22313737 email alto altoproaudio com Fax 886 4 22346757 c All rights reserved to ALTO All features and content might be changed without prior notice Any photocopy translation or reproduction of part of this manual without written permission is forbidden Copyright 2004 Sekaku Electron ...
