IA21 manual
Contents
1. a YS Ter va Fr ye You ve fallen in love with the dazzling appearance and captivating Specifications tube sound of Myst res ia11 but you want more more power POETOE P COSE more dynamics more flexibility The ia21 is designed specifically Power output 50 50W 8 Ohm 1 thd aru iaga ma po duia oer e Ar oe ae es Pee ae 50 watts per channel that sound like 100 Coupled with Myst re s Bandwidth O a pentode push pull design ia21 s sonics strike you immediately as 9Hz 52kHz 1db 50W a tones snappy transients A oe ee ee ss Glee soundstage that puts you third row center E ee SR Gain 30dB 31 1x at max volume The a21 runs a power tubes and E an ET Soe eens ea DR S toBias circuit that automatically adjusts each tube to its sweet spot oom The ia21 takes that process one step further The minds of Mystere 0 2 OW have developed a special circuit that automatically re calibrates the 1 full power SOW Adaptive AutoBias board for EL34s or KT88s One flick of a switch e E S ene eee FARRAR E A E E Ce AA AnEEAA Consumption 230W max allows you to run either tube at its optimal level You can play with E E E ER A E A N E E power tubes forever nudging the amp s sound this way and that Net weight Te f Takes about a minute to swapem out a a The ia21 utilizes all the same high quality point to point wiring dual layer polypropylene coupling caps low noise resistors and high purity copper conduc2. be limited to duration of this warranty This warranty does not extend to any indentical or consequential costs or damages to purchaser or third parties Our liability will be no more than the amount you paid for the product that is the subject of a claim This is the maximum amount for which we are responsible This warranty gives you specific legal rights You may also have other rights which vary from country to country and state to state The Mystere Story Its midnight and the year is 1 500 BC An eerie wind is blowing across the Salisbury Plain in southern England and the flat green ground is bathed in the moon s ghostly light A faint orange glow can be seen in the distance seemingly coming from a huge circle of majestic stones that stand out in solitary grandeur against the barren landscape As one draws closer dark figures dancing around the wooden fire that smoulders at the centre of the great circle of stones become visible Strangely not a sound can be heard The whole place is shrouded in mystery am of course referring to the world famous Stonehenge which stands to this day as a powerful tribute to the people of the late Stone and Bronze Ages and consists of a ring of extremely large stones and while modern techniques in archaeology have helped shape new theories about these stones their ultimate purpose nevertheless remains a fascinating and enduring mystery Whatever their exact purpose was recent research h
3. source to the corresponding plugs Connect your speaker wires positive to positive negative to negative to your integrated amplifier Warning Plug the powercord into the amplifier then into the wall socket Do not replace fuses with any Switch the amplifier on and wait for 30 60 seconds to warm up the fuse other than the same type tubes Other parts will need more time to sound at their best specially and rating as used by the factory the first time you use the amplifier ia2 l The front panel and the chas sis of the Myst re models are finished in high gloss piano lac quer finish The power switch is located on the right side of the amp just behind the front plate The EL34 KT88 switch on the left side of the amp Looking atthe rear panel you will note four pairs of stereo inputs and the pair of speaker terminals Attach the positive from your loudspeaker to the 4 or 8 ohm terminal that most closely matches the average impedance of your loudspeakers according to their manufacturer s specifications The negative from your loud speaker attaches to the 0 Ohm terminal Tip Experiment using the 4 or 8 Ohm positive terminal to find the best match for your speakers Do not make any assumptions Trust your ears a YS Ter MERE Fuse Protection A note on fuses Fuses are safety valves They should always be replaced with the exact same value and type Warning Never attempt to ch
4. Myst re ia21 has a warm up time of just a few minutes Do not leave the amplifier on 24 hours a day Break in yields improvements Every tube when new needs to be left alone for a little while So when your amplifier is new or when you re tube it it may take a little time to settle in There is however no fixed time rule for break in e Please note that tubes can vary electrically and by plugging in the wrong type of tube you can damage the amplifier and void your warranty a YS Ter MERE Tube Tip Some 6sn7 tubes are more microphonic than others In your ia21 the 6sn7 positions most sensitive to this are the input tubes V1 and V2 Experiment if you want with different 6SN7 tubes in the market to get your opti mal sound You also may ex periment with the different tube dampers available in the market to fine tune your amplifier a YS Ter va r ye Some tips No output Power is on but power LED is off and tubes do not light up AC cable makes bad connection in IEC connector Please check No output Power is on but power LED is off and tubes do not light up Mains fuse is out Replace fuse as per instructions on page 5 No output Power is on but power LED is off and tubes do not light up Mains fuse is not out Thermal protection may have switched off power transformer If so the amplifier will switch on again after internal temperature of power transformer returns to normal Ove
5. as revealed that the stones at Stonehenge are able to contain and amplify sounds Furthermore most sounds made in the centre are not clearly transmitted beyond the rings of stone Almost all of the stones at Stonehenge were shaped with the inner surfaces of many stones being dressed to be either flat or concave and their outer surfaces irregular or convex The contrasting acoustic experiences between the inside and outside of the stone circle that result from the shaping and placement of these stones may have been utilised by the ancient builders to isolate people on the outside from the activities at the centre An audience occupying the inner circle of Stonehenge would have heard amplified sounds In contrast no one outside the monument could have clearly seen or heard events within thus creating a sense of mystery Recent research suggests that the original Stonehenge probably had an almost concert like acoustic that our ancestors developed and perfected over many generations While undertaking a series of tests one researcher commented A simple drum beat sounded incredibly dramatic It felt special Similarly we want to invite you to join our select inner circle of audiophiles to sample the delights of the Myst re series Be enticed towards the faint orange glow of the tubes that peer out from between the vertical slots of the sleek cover Marvel at the realism and joy of music that has been perfected over many generations of equipment design
6. eck or replace a fuse while the amplifier is plugged in Turn off the amplifier Unplug all speakers components and AC cords Wait 10 minutes to let tubes cool down and the circuit to fully discharge Mains Fuse The mains fuse is located on the rear of the amplifier at the top of the power cord socket The fuse holder can be snapped out using a small slotted flat blade screwdriver ia2 The 6SN7 tubes will have a life of about 10 000 hours However the life soan of power tubes is more difficult to predict It greatly depends on how gently or roughly you use your amplifier In general under normal conditions you can figure between 2 000 and 3 000 hours Here are some tips on using tubes Do not use treatments on tube pins or in sockets If you decide to experiment with other tube types it s best not to swap tubes in and out repeatedly as you never want to cycle pre amplifiers on and off rapidly They should be left off for at least five minutes Further every time you insert a tube you stand a chance of loosening the tube sockets It s okay to have fun and we support that but don t go crazy and swap tubes in and out twenty times in a day Always use the white gloves to prevent fingerprint smudges Some tubes and tube socketshave a center key which must correspond If you use brute force and misalign you will damage important and ex pensive parts of your amplifier The
7. ere eu com website you will find links to these and other websites Troubleshooting ncc 7 Our prices are kept low by using word of mouth and customer feedback and we would appreciate hearing what you have to say about our product If you Wanca Ch a 8 need service during or after the warranty period please contact us A SOIN CC NEC Copyright Durob Audio B V 2009 Herman van den Dungen DUROB AUDIO BV a YS Ter va r ye To prevent serious injury electrical shock or fire Contents Do not operate with bottom plate removed 1x Myst re ia21 Keep away from rain and moisture Integrated amplifier Always disconnect all cable connections before changing fuses and or tubes 1x Power Cord Do not replace tubes without reading instructions Do not replace fuses or tubes if you have any doubt about your ability to do so We accept no responsibility for any personal or material damage due to incompetent use or users 1x Owner s Manual 1x White Gloves Remove the Myst re ia21 from its packaging Use the white gloves Remove the tube cage by pulling it up and away from the amplifier Tubes 4x 6SN7 Remove the protective foam surrounding the tubes 4x KT88 Check that each tube is firmly seated in its socket Use the white gloves Fuses Littelfuse Series 218 or 219 Replace cage back in its place if desired 1 x 3 15AT 100 1 20VAC Check to see the power switch is off down 1 x 1 6AT 200 240VAC Connect each
8. oduct has not been used in accordance with the instructions found elsewhere in this manual or if it has been misused abused damaged by accident or neglect or in transport once in possession of purchaser The warranty is also void if the product has been tampered with or has been repaired or modified by anyone other than Durob Audio BV or its specifically authorized representatives 3 Remedy If this product contains material manufacturing or workmanship defects it must be packed in orginal pack aging and returned to Durob Audio BV or its authorized representative via insured freight at the owner s expense Returned products must be accompanied by written description of the defect and a return authorization number available from Durob Audio BV or the authorized representative via e mail Upon receipt of the defective product Durob Audio BV or the authorized representative agrees to repair the product without charge for parts except vacuum tubes if the unit is more than 6 months old or labor The product will then returned via prepaid insured freight with carrier at the sole determination of Durob Audio BV or the authorized representative This constitutes the purchaser s sole remedy 4 Design change Durob Audio BV and its partners reserve the right to modify their products or change specifications at any time without obligation or liability to previous purchasers 5 Miscellaneous Any implied warranties relating to the above product shall
9. resulting in the Mystere range of audio products Now your search for the ultimate experience is over a YS Ter rir LR Sales amp Support Mystere Durob Audio BV P O Box 109 5250 AC Vlijmen The Netherlands 31735112555 www mystere eu com info mystere eu com Email us for your local distributor
10. rheating might be caused by higher environment temperature than normal or heavy use No output Power LED is on and tubes do light up normally Check input selector setting inout and output wiring Hum or noise coming from one channel Noisy tube First swap the 6SN7 tubes in pairs left to right If noise follows tube swap then you have found the problem tubeset Now swap one by one from left to right If noise follows you have found the proble matic tube Hum coming from one channel Possible bad output tube Swap the output tubes in pairs from right to left If hum follows the swap swap the far left and far right tubes If the hum returns to the original problem channel you have found the problem tube If not swap the inside output tubes left to right Noise distortion coming from both channels Tubes may be in need of replacement Read page 6 for tube basics and replacement options If you try these possible solutions and problems persist contact us or your local distributor for further investigation a YS Ter va Fr ye Two year limited warranty Six month warranty on stock vacuum tubes 1 Limited to original purchaser This warranty is for the sole benefit of the original purchaser of the covered product and may not be transferred to a subsequent owner 2 Conditions amp Limitations This warranty is subject to conditions and limitations as follows This warrantly is void and inapplicable if the pr
11. tors Top it off with an exceptionally Websites designed 24 step volume attenuator and soft start circuitry that prolongs the life of vacuum tubes and other critical components H www mystere eu com and you ve got an integrated amp that will remain a centerpiece in RCE Ceres nee HEC KEE EE eee CCD Le e any system for years to come ee NUS SRE a YS Ter 97 Fr We would like to thank you for choosing our Myst re ia21 integrated ampli Table of Contents fier as an important part of your music system IDS CROW Olean asm ven eens 2 Working with components across the spectrum day in and day out for more than 30 years led us to adopt an unassailable philosophy the only acceptable eN TON e re 2 level of quality for the products we produce is the highest quality regardless of price point Ute OU Merete eee seca 3 We have staked our reputation on this and are certain that the products we ve already brought to market reflect this principle We feel comfortable in stating that our standing in the audio community is of the highest order and we re Warning Setup Contents 4 We hope that the Myst re ia21 integrated amplifier will make you want to FIO CLONER eee eee S follow our next steps in expanding this new range of products If you have any questions or comments don t hesitate to contact us You can also share your Tube Basics nnn 6 thoughts with others at www audioreview com or other review sites On the www myst
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