NF00870 (amictube ALTO.^..)?..
Contents
1. ee 5 3 CONTROL ELEMENTS 5 3 1 The Front Panel a Guidepost of The Front Panel b Supplementary Descriptions 3 2 The Rear Panel a Power Supply Connection b Analogue Inputs Outputs 4 INSTALLATION amp 8 4 1 Mains Connection 4 2 Audio Connection a Wiring Configuration b In Line Connection 4 3 Rack Mounting 5 8 01 9 5 1 The as A Microphone Preamplifier 5 2 The MiCtube as A Direct Injection Box DI Box 5 3 The MICtube as A Level Translator 6 TECHNICAL SPECIFICATIONS 11 6 1 Block Diagram 6 2 Specifications TENNIS RN gc 19 1 INTRODUCTION Thank you very much for expressing your confidence in ALTO products by purchasing our MICtube Stereo Tube Preamplifier With the MICtube you have acquired extremely musical and flexible Stereo Microphone Preamplifier 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 televi sion studios The ALTO a MICtube meets highes2. e Instead of operating in accordance with the user s manual thoroughly any abuse or misuse of this product e Normal tear and wear e The product has been altered or modified in any way e Damage which may have been caused either directly or indirectly by another product force etc Abnormal service or repairing by anyone other than the qualified personnel or technician And in such cases all the expenses will be charged to the buyer 3 5 In event shall ALTO be liable for any incidental consequential damages Some 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 also have other statutory rights that may vary from state to state SEIKAKU TECHNICAL GROUP LIMITED No 1 Lane 17 Sec 2 Han Shi W Road Taichung 401 Taiwan http www altomobile com Tel 886 4 22313737 email info altomobile com Fax 886 4 22346757 All rights reserved to ALTO Mobile Due to continued development in response to customer feedback product features specifications and or internal external design may be changed without prior notice No photocopying translation or reproduction of any part of this user manual is allowed without prior written permission Copyright 6 2004 Seikaku Technical Group Limited NF00870 1 0
3. MiCtube Fw m Rua kam a eas User s Manual STEREO TUBE PREAMP www altoproaudio com Version 2 0 Dec 2002 English SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol wherever used alerts JN 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 Nns symbol wherever used alerts you to important operating and ma intenance instructions Please read QD Protective Ground Terminal mains Alternating Current h Hazardous Live Terminal ON Denotes the product is turned on OFF Denotes the product is turned off WARNING Describes precautions that should be observed to prevent the possibility of death or injury to the user CAUTION Describes precautions that should be observed to prevent damage to the product WARNING e Power Supply Ensure that the mains source voltage AC outlet matches the voltage rating of the product Failure to do so could result in damage to the product and possibly the user Unplug the product before electrical storms occur and when unused for long periods of time to reduce the risk of electric shock or fire e External Connection Always use proper ready made insulated mains cabling power cord Failure to do so could result in shock death or fire If in doubt seek advice fr
4. and the resulting sound is infinitely richer and sweeter An over driven signal can be achieved by significantly raising the level of the Drive control This over driven tube effect is extremely useful in providing cool guitar sounds and way cool for use with harmonicas for that authentic Blues harp vibe The limits on the possibilities of the Drive control are up to you your application and your imagination 3 2 The Rear Panel CHANNEL2 OUTPUT CHANNEL1 OUTPUT 18VAC rj MEM SERIAL BALANCED UNBALANCED BALANCED UNBALANCED a Power Supply Connection Please use the 18VAC AC AC Adaptor provided by ALTO to connect your MlCtube Detail your can follow the illustration 18VAC POWER SERIAL b Analogue Inputs Outputs The Output XLR Connector is servo balanced and operates at 4dBu The Output 1 4 Phone jack is unbalanced and operates at 10dBv 7 4 INSTALLATION amp CONNECTION 4 1 Mains Connection Please ensure that the ALTO g MlCtube Stereo Microphone Preamplifier is connected to the correct supply voltage before operating this unit Only use the 18VAC AC AC Adaptor provided by ALTO 4 2 Audio Connection The ALTO aMlCtube Stereo Tube Preamp presents with balanced XLR connectors and 1 4 TRS phone jack and it can be interfaced by several ways to support a variety of applications without any signal loss a Wiring Configuration Either the 1 4 TRS Tip R
5. application The Input Gain control allows you to raise or lower your input signal level by as much as 30dB The functions Phase Inversion is also enabled in this mode 6 TECHNICAL SPECIFICATIONS 6 1 Block Diagram AlddOLV1NO3Y 39V110A Aldd u3M0d 3SVHd lt 7 EE 2 co t 4 WO1NVHd 07 A A 1 LAdLNO LHO E 1XvCV 38n1 ASVHd LL Ee 3 22 O xX olg LAN ZN SNOHdOUOIN LH 13 S 7 K v V K Co E9LYNI ZN ZN LN 7 7 1 dNI SNOHAOYOIN V 2 COLVNI ai x O EHe 6 2 Specifications Type Servo controlled stabilized Input 18VAC Power 14 Watts Transformer External Wall Mount Input 5K Ohm 1M Ohm Neutrik Combo Output 100 Ohms 100 Ohms Panel Controls OdB to 40dB OdB to 30dB Performance KW ss lt 0 5 90dB gt 98dB Dual Servo Meter 24dBu to 18dBu Physical 1 05Kg 199 W x 153 D X 45 H mm Steel Brushed Aluminum ALTO Style PowerSuply Input __ Power Transformer 7 WARRANTY 1 WARRANTY REGISTRATION CARD To obtain Warranty Service the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of th
6. Sound Processor and a large range of state of the art algorithms which have been developed by our Software Team for the last 7 years Because we are convinced you are the most important member of ALTO AUDIO TEAM and the one confirming the quality 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 guarantee you also in future the best quality and the best fruits of our continuous researches and the best prices Our MICtube Stereo Preamplifier is the result of many hours of listening and tests involving common people area experts musicians and technicians The result of this effort is a half rack space unit the heart of which is an extremely low noise microphone pre amp circuit that uses discrete components to produce a highly transparent sound Nothing else to add but that we would like to thank all the people that made the ALTO a MlCtube Stereo Preamplifier a reality available to our customers thank our designers and all the ALTO staff there to make possible the realization of products containing our idea of music and sound and there to support you our customers in the best way conscious that you are our best richness Thank you very much ALTO AUDIO TEAM TABLE CONTENT 1 INTRODUGC TION 5 2 FEATURE LID
7. rack shelf available from various rack manufacturers or your music dealer The MICtube Stereo Tube Preamplifier s height conforms to single space mounting and up to two a MICtube Stereo Tube Preamplifier may be mounted side by side in a standard universal EIA 19 equip ment rack e STEREO TUBE PREAMP PUTEM A 69 69 22 20 5 APPLICATIONS This section presents some typical applications of our ALTO a MICtube Stereo Micro phone Preamplifier Please reserve your time to well understand the application exam ples so as to be able to fully exploit the MlCtube and its versatile features 5 1 The MICtube as A Microphone Preamplifier It is the basic application for MICtube Before you can use the ALTO o MlICtube as a Stereo Microphone Preamplifier we recommend that you study the various functions of the unit first The high gain factors 30dB provided by the microphone preamplifier can produce extreme levels the output side which damage subsequent devices so you should turn down all the level controls beforehand or you can press the 20dB Pad 7 8 to attenuate the incoming signal level about 20dB then hook up a microphone to the XLR and 1 4 Combination Input 9 10 use either the jack or XLR output connectors to connect the audio system Now power up the entire equipment if you wish to use a condenser mic requiring 48V phantom power please press the Phantom Power Swit
8. L 1 Output Level Display LED 3 CHANNEL 2 Output Level Display LED 4 Phantom Power Switch 5 6 7 8 20dB PAD 9 10 Combination Microphone XLR and Instrument 1 4 inch input 11 13 Input Gain Control 0 to 30 dB 12 14 Drive Control 0 to 40 dB 5 6 Phase Reverse Switch 1 b Supplementary Descriptions Phantom Power Switch 4 This switch activates the 48 volts phantom power to supply condenser mics and any other devices requiring continuous power by means of the XLR cable The 48V is applied both to the positive pin2 and negative inputs pin3 of the XLR connector XLR Connector Phantom Power Supply PIN1 Ground GND PIN2 Positive 48V PIN3 Negative 48V Caution Please make sure that you are using an appropriate microphone before you 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 Phase Reverse Switch 5 for CHANNEL 1 and 6 for CHANNEL 2 This Phase Reverse Switch reverses the audio signal s phase by 180 Normally you won t need this switch however in some cases it might be necessary for ex ample the inversion of the pins of the XLR connector may be necessary to alter the audio phase of t
9. ch 4 to avoid electric damage please read Control Elements Phantom Power Switch carefully After that please adjust your Input Gain Control and Drive Control to get the best result 5 2 The o MICtube as A Direct Injection Box DI Box 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 unbalanced signal coming from the instrument into a balanced signal that is sent over the line Interference included in balanced cables is then eliminated by a subsequent balanced input stage Using the ALTO as a Stereo Microphone Preamplifier for this application is very easy Simply connect the line output of your instrument to the XLR and 1 4 TRS combination Input on the front panel of a MICtube then use the MICtube s balanced output to send the signal to the next stage 5 3 The a MICtube as A Level Translator Semi professional appliances in home recording system are normally operated with a nominal level of 10dBV while the level used in studios and other professional application is OdBu or 4dBu So when you connect devices of both types to each other you should consider some kind of level translators of course The ALTO a MlICtube as a Stereo Microphone Preamplifier is pretty suited for this
10. e sales status so as to purport a more effective and efficient after sales warranty service Please fill out all the information carefully and genuinely miswriting or absence of this card will void any of your warranty service 2 RETURN NOTICE 2 1 In case of return for any warranty service please make sure that the product is well packed in its original shipping carton and it can protect your unit from any other extra damage 2 2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine and give detail information about your return address and contact telephone number 2 3 A brief description of the defect will be appreciated 2 4 Please prepay all the costs involved in the return shipping handling and insurance 3 TERMS AND CONDITIONS 3 1 ALTO warrants that this product will be free from any defects in materials and or workman ship for a period of 1 year from the purchase date if you have completed the Warranty Registration Card in time 3 2 The warranty service is only available to the original consumer who purchased this product directly from the retail dealer and it can not be transferred 3 3 During the warranty service ALTO may repair or replace this product at its own option at no charge to you for parts or for labor in accordance with the right side of this limited warranty 3 4 This warranty does not apply to the damages to this product that occurred as the following conditions
11. ing 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 e For 1 4 Phone jack x H 4 Ring Tip Ring Tip Sleeve Sleeve TS Type Unbalanced TRS Type Balanced TRS Type Unbalanced e For XLR connector Pin3 Linked to Pin1 manually Pin1 2 XLR Type Unbalanced XLR Type Balanced b In Line Connection For these applications the a MICtube Stereo Tube Preamp provides XLR con nectors and 1 4 TRS phone jack to easily interface with most professional audio devices Follow the configuration examples below for your particular connection e Balanced Ring O Ring TIP RING SLEEVE SPEEVERINGTIF Sleeve 0 Sleeve Tip 1 pTO 8 TIP RING SLEEVE Sleeve 3 e Unbalanced Tip qar I fue JC wg 7 139 TIP RING SLEEVE Sleeve N N SLEEVE DNE P 3 Screen Tip O Tip TIP SLEEVE SLEEVE TIP Sleeve Sleeve Tip Ring Ring TIP RING SLEEVE SLEEVE RING TIP Sleeve Sleeve ZA Tip O Centre Sleeve Screen TIP SLEEVE Tip xH J lt ule Screen TIP RING SLEEVE Sleeve 1 1 2 2 3 3 4 3 Rack Mounting The most secure mounting is on a universal
12. om a registered electrician Do not Remove any Covers 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 Fuse To prevent fire and damage to the product use only the recommended fuse type as indicated in this manual Do not short circuit the fuse holder Before replacing the fuse make sure that the product is OFF and disconnected from the AC outlet Protective Ground Before turning the product ON make sure that it is connected to Ground This is to prevent the risk of electric shock Never cut internal or external Ground wires Likewise never remove Ground wiring from the Protective Ground Terminal Operating Conditions Always install in accordance with the manufacturer s instructions To avoid the risk of electric shock and damage do not subject this product to any liquid rain or moisture Do not use this product when in close proximity to water 1 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 IMPORTANT SAFETY INSTRUCTIONS Read these instructions Follow all instructions Keep these instructions Do not discard Heed all warnings Only use attachments accessorie
13. s specified by the manufacturer Power Cord and Plug Do not tamper with the power cord or plug These are designed 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 e Cleaning When required either blow off dust from the product or use a dry cloth Do not use any solvents such as Benzol or Alcohol For safety keep product clean and free from dust e Servicing Refer all servicing to qualified service personnel only Do not perform any servicing other than those instructions contained within the User s Manual Preface Dear Customer Thanks for choosing ALTO Stereo Tube Preamplifier and thanks for choosing one of the results of ALTO AUDIO TEAM job and researches For our ALTO 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 professional audio products for a long time in cooperation with some of the major brands in the world in the audio field The ALTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R amp D centers in Italy Netherlands United Kingdom and Taiwan The core of our digital audio products is a sophisticated DSP Digital
14. t and no compromise requirements in terms of operation sound specifications and workmanship The ALTO a MICtube is a half rack space unit the heart of the MlICtube is extre mely low noise microphone pre amp circuit that uses discrete components just like 12A X7WA Tubes and TLO74CD J FET Quad Operational Amplifier IC to produce a highly transparent sound The switchable 48V Phantom Power supply allows you to operate your condenser microphone more conveniently 2 FEATURE LIST e Half rack space Robust and Compact design e Dual Servo Microphone Preamplifier 20dB pad e 48V phantom power e Phase Reverse 8 Digit Output Level meter e 12AX7WA 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 preamplification e High quality and fidelity components SMD Technology for top performance e Manufactured under QS9000 VDA6 1 certified management system 3 CONTROL ELEMENTS 3 1 The Front Panel m QMICtube STEREO TUBE PREAMP OUTPUT CHANNEL OUTPUTT CHANNEL2 00000000 PWR 24 18 12 6 0 6 12 18 24 48 12 6 0 6 12 18 C C PHASE PHASE PHANTOM piod PAD PAD N en 0 30 0 40 e 0 30 0 40 e INPUT1 INPUT2 INPUT GAIN DRIVE INPUT GAIN DRIVE 9 10 4 11 12 7 13 14 8 Guidepost of the front panel 1 Power LED 2 CHANNE
15. wo link microphones to compensate for phase cancellation It may be required that the wiring of a cable s XLR connector be switch to successfully utilize Phantom power 20dB Pad 7 for CHANNEL 1 and 8 for CHANNEL 2 A 20dB Pad is available on each channel to attenuate the incoming signal level to provide increased headroom for the operator Input Gain 11 for CHANNEL 1 and 13 for CHANNEL 2 This control sets the amount of boost to the signal being processed by this pre amplifier Use this control to adapt the MlCtube to either home recording level 6 10dBV or professional level 4dbu When the gain is too low the tube effect becomes less audible and the S N Signal to Noise ratio deteriorates Generally Dynamic mics and instruments without preamps will require more gain than con denser mics and instruments that 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 To obtain the best possible S N Signal to Noise ratio and subsequently the best transparent sound keep an eye on the 8 Digit Output Level Meter Drive 12 for CHANNEL 1 14for CHANNEL 2 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 electric bass
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