Lanzar Car Audio VIBE421 Car Amplifier User Manual
Contents
1. ALL TUBE CLASS A HERITAGE AMPLIFIER 2 27 2 9 2 lt 4 LLI O wer Lu LANEY AMPLIFICATION www laney co uk IMPORTANT SAFETY INSTRUCTIONS WARNING When using electric products basic cautions should always be followed including the following Read all safety and operating instructions before using this product The product should be powered by a three pin grounded or earthed plug connected to a power socket with a grounded earth outlet All safety and operating instructions should be retained for future reference Obey all cautions in the Operating instructions and on the back of the unit All operating instructions should be followed This product should not be used near water i e a bathtub sink swimming pool wet basement etc This product should be located so that its position does not interfere with its proper ventilation It should not be placed flat against a wall or placed in a built up enclosure that will impede the flow of cooling air 8 This product should not be placed near a source of heat such as stove radiator or another heat producing amplifier 9 Connect only to a power supply of the type marker on the unit adjacent to the power supply cord 10 Never break off the ground pin on a power supply cord Power supply cords should always be handled carefully Never walk or place equipmen2. will give a nice crisp bluesy lead tone again with the Page 6 16 La OPERATING INSTRUCTIONS ability to drive the output stage at higher Drive Volume settings Setting a high level on the Drive control and a low setting on the Drive Volume will give you a punchy hard rock lead tone with the ability to again drive the output tubes at higher Drive volume settings Having set the Drive and Drive Volume controls to your desired sound try backing off your guitar volume and tone controls for lots of other cool sounds Good tube amplifiers have the unique ability to produce a wide range of sounds by using only your guitar controls playing weight and style DRIVE VOL Sets how loud the Drive channel is It is useful to experiment with drive levels and drive volumes If you want a very open warm and semi overdriven sound try reducing the amount of drive and increasing the drive volume This reduces pre amp gain but pushes the power amp section and makes it work harder giving you a very desirable level of power amp distortion which is a very pleasing retro style sound DRIVE LED This led will illuminate when the Drive channel is activated with the Drive switch 8 or the included Laney FS2 remote footswitch DRIVE SWITCH Switch up to enable the Drive channel This switch must be in the engaged position in order for the drive to be switched remotely via a foot switch BASS MIDDLE TREBLE These are a traditional set of passive to
3. BE EARTHED TO REDUCE THE RISK OF ELECTRIC REFER TO USER MANUAL EFFECTS LOOP 1 WARNING SHOCK DO NOT REMOVE COVER FOR vp TO REDUCE THE RISK OF OR NO USER SERVICABLE PARTS INSIDE ELECTRIC SHOCK DO NOT EXPOSE REFER SERVICING QUALIFIED HT FUSE THIS APPLIANCE TO RAIN OR MOISTURE SERVICE PERSONEL EHE Co Ld DRIVE 27 RING SERIAL NO www laney co uk ms 16 115V TI GA L250V CAUTION TO REDUCE THE RISK OF FIRE p mm INTERNAL CABINET RETURN SEND POWER 2307 250V REPLACE WITH SAME TYPE AND RATING RISK OF ELECTRIC SHOCK DO NOT OPEN MADE IN THE U K ONLY USE ONE IMPEDANCE SELECTION AT A TIME POWER Main power switch for unit POWER INLET SOCKET Connect to your power source Make sure the specified voltage is correct for your country POWER FUSE This drawer contains the main safety fuse for the unit The fuse protects the AC power to the amplifier USE ONLY THE CORRECT SIZE AND RATING OF FUSE AS SPECIFIED ON THE PANEL If a fuse blows or fails and a replacement of the same size and rating is installed and it in turn blows the amplifier has suffered a malfunction internally and needs immediate service from a qualified technician DO NOT TRY USING A FUSE OF HIGHER RATING Using a fuse that is too large in current rating may cause serious irreparable damage to the amplifier and presents a serious fire hazard
4. O Via a side chain type gas BRIGHT CLEAN 9 VOLUME a i 16 OHM o lo SOCKET HI INPUT m 80HM i Vib gt LI Ll i 4 OHM LO INPUT SOCKET Kt V3 v4 V5 V6 V7 DRIVE V VOLUME REVERB LEVEL V TONE CONTROL General Notes Amplifier connection In order to avoid damage it is advisable to establish and follow a pattern for turning on and off your equipment With all system parts connected turn on source equipment tape decks cd players mixers effects processors etc BEFORE turning on your guitar amplifier Many products have large transient surges at turn on and off which can cause damage to your speakers By turning on your guitar amplifier LAST and making sure its Volume controls are set to minimum any transients from other equipment will not reach your loudspeakers Wait until all system parts have stabilised usually a couple of seconds Similarly when turning off your system always turn down the Volume controls on your guitar amplifier and then turn off its power before turning off other equipment Cables never use shielded or microphone cable for any speaker connections as this will not be substantial enough to handle the amplifier load and could cause damage to your amplifier system Caution These professional loudspeaker systems are capable of generating very high sound pressure levels Use care with placement and operation to avoid exposure to excessive l
5. The mains fuse ratings are detailed in the specs section at the rear of this manual HT FUSE This fuse protects the DC power to the tubes within the amplifier USE ONLY THE CORRECT SIZE AND RATING FUSE AS SPECIFIED ON THE PANEL If a fuse blows or fails and a replacement of the same size and rating is installed and it in turn blows the amplifier has suffered a malfunction at this point check the output tubes and replace faulty ones if required Should tubes not be the problem the amplifier should be checked out by a qualified technician Do not try using a fuse of greater value Using a fuse that is too large in current rating may cause serious irreparable damage to the amplifier Fuses are designed to protect do not take chances SERIAL NO Displays the model and serial number of the unit EXTENSION CABINET Use to connect an 4 16 ohm extension cabinet Please note mismatched impedance will reduce the amplifiers performance and in some cases may cause damage to your amplifier Try the L20H into a Laney Lionheart LT 212 cabinet you will be amazed what this little baby cranks out Page 8 16 La L Cy OPERATING INSTRUCTIONS EFFECTS LOOP RETURN Connect the output from your external effects to this socket The effects loop allows you to connect external effects such as tremolos chorus and delays to your amplifier A portion of the signal leaves the amplifier via the Send socket and comes back from the effects via the Return socke
6. e 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10 OPERATING INSTRUCTIONS POWER 45 RUN 3 STANDBY POWER 40 RUN 7 STANDBY POWER lt RUN v STANDBY POWER 42 RUN v5 STANDBY Page 10 16 USER SETTINGS Store your own cool sounds CLEAN DRIVE INPUT VOLUME rire VOLUME Q dr Pi m 4 6 4 6 4 6 4 6 4 6 4 6 4 6 0 3 7 BRIGHT 3 p 7 DRIVE 3 i23 7 3 7 3 2 e 2 8 2 8 m 2 8 2 8 2 8 2 1 9 1 9 1 9 1 9 1 9 1 9 1 0 10 0 10 0 10 0 10 0 10 0 10 0 10 CLEAN DRIVE INPUT VOLUME coi VOLUME Q oe ud M 4 6 4 6 4 6 4 6 4 6 4 6 4 6 3 7 BRIGHT 3 P 7 DRIVE 3 1 3 1 3 7 3 2 8 2 82 s 1 2 8 2 8 2 8 2 1 9 1 9 1 9 1 9 1 9 1 E 3 0 10 0 10 0 10 0 10 0 10 0 10 0 10 CLEAN DRIVE INPUT VOLUME ride VOLUME Q ji S 4 6 4 6 4 6 4 6 4 6 4 6 4 6 0 3 7 BRIGHT 3 7 3 7 DRIVE 3 1 5 I 3 1 3 2 2 82 8 2 82 82 82 1 9 1 9 1 9 1 9 1 9 1 9 1 0 10 0 10 0 10 0 10 0 10 0 10 0 10 CLEAN DRIVE EN INPUT VOLUME VOLUME Q MAS dO iru m 4 6 4 6 4 6 4 6 4 6 4 6 4 6 7 BRIGHT 3 rs 7 DRIVE 3 7 3 7 3 2 e 6 2 82 8 9 2 8 2 8 2 8 2 1 9 1 9 1 9 1 9 1 9 1 9 1 0 10 0 10 0 10 0 10 0 10 0 10 0 10 TONE 456 7 OPERATING INSTRUCTIONS POWER RUN STANDBY POWER RUN STANDBY POWER RUN STANDBY POWER Q RUN STANDBY Page 11 16 OPERATING INSTRUCTIONS Laney TUBE AMPLIFIER SURVIVAL TIPS Tube amplifiers generally sound much warmer s
7. e cover No user serviceable parts inside Refer servicing to qualified personnel To prevent electrical shock or fire hazard do not expose this appliance to rain or moisture Before using this appliance please read the operating instructions for further warnings Ce symbole est utililise pur indiquer a l utilisateur de ce produit de tension non isolee dangereuse pouvant etre d intensite suffisante pour constituer un risque de choc electrique Ce symbole est utilise pour indiquer a l utilisanter qu il ou qu elle trouvera d importantes instrucions sur l utilisation et l entrerien service de l appareil dans la litterature accompagnant le produit Risques de choc electrique NE PAS OUVIRIR Afin de reduire le risque de choc electrique ne pas enlever le couvercle Il ne se trouve a l interieur aucune piece pouvant etre reparee par l utilisateur Confier l entretien a un personnel qualifie ADVERTISSEMENT Afin de prevenir les risques de decharge electrique ou de feu n exposez pas cet appareil a la pluie ou a l humidite Avant d utiliser cet appareil lisez les advertissments supplentaires situes dans le guide PRECAUCION PRECAUCION Este simbolo tiene el proposito de alertar al usuario de la presencia de voltaje peligroso que no tiene aislamiento dentro de la caja del producto que puede tener una magnitud suficiente como para constituir riesgo de corrientazo Este simbolo tiene el proposito de la alertar al usario de la
8. etc They need not be changed at any regular interval Typical problems with preamp tubes can be a crackley noise hiss hum and microphony The preamp tubes can safely be changed with no action required if they fail or reduce in performance dd output tube po can be blown HT fuse sound lacking in punch sound lacks extreme highs or lows and low level hum Exact replacement preamp tubes and output tubes are available from Laney via your dealer To change a tube switch off the unit and unplug from the mains supply Wait for the tubes to cool down Lay amplifier down on its front face and remove the protective grille held in place with four screws You should now be able to access the underside of the amplifier chassis Preamp tubes are protected with a screen can to remove gently twist the screen can anti clockwise and then pull up The tube can then be gently pulled out Take care when pushing the new tube in to make sure the pins are all aligned properly Output tubes have a spring retainer which must be before the tube will come out VI ECC83 I2AX7 HIGRADE V2 V3 ECC83 I2AX7 V4 V7 EL84 POWER TUBE EL84 Grade Number Page 12 16 L20H CONNECTIONS WITH FX OPERATING INSTRUCTIONS ve M SS A d b o M gt a L20H WITH EXTENSION CABINETS Page 13 16 OPERATING INSTRUCTIONS BLOCK DIAGRAM FXSEND FX RETURN The FX loop is
9. evels that can cause permanent hearing damage Refer to guidelines on page 2 Servicing The user should not attempt to service these products Refer all servicing to qualified service personnel Page 14 16 Lane SPECIFICATIONS y Supply Voltage Factory Pre set Option 100V 120V 220V 230V 240V 50 60Hz Mains Fuse 220V gt 240V T630mA L 250V 100V gt 120V T1 6A L 250V HT Fuse T315mAL Power Consumption 50W Output Power Rating 20W FX Loop Side Chain type nominal 750 level SPECIAL FEATURES Pure Single Ended Class A Valve tone Gold plated PCB s and Jacks Hi and Low Gain Inputs OPERATING INSTRUCTIONS Loudspeaker outputs 4 8 16 Ohms sockets EQ Passive Bass Middle and Treble Tone Boost amp cut Active on top end of signal Bright Switch Input Impedance 1MOhm Size 250 559 250 H W D Unit Weight 17 0 Kg Shipping Weight 18 0 Kg Sealed gold contact relays used in all signal switching for minim m effect to your sound Oversized power supplies and output transformers for that big powerful sound and long term reliability The best available specially selected tubes throughout 4 EL84 Power Tube 3 ECG83 12AX7 Preamp Tubes TAD Selected The renowned type 4 large spring line for that classic guitar reverb sound Birch plywood cabinet construction for optimum sound quality and road worthinness This product conforms to the requirements of the following European Regulatio
10. hat it is factory fitted with a three pin grounded or earthed plug Before plugging into the power supply ensure you are connecting to a grounded earth outlet If you should wish to change the factory fitted plug yourself ensure that the wiring convention applicable to the country where the amplifier is to be usedis strictly conformed to As an example in the United Kingdom the cable colour code for connections are as follows EARTH OR GROUND GREEN YELLOW NEUTRAL BLUE LIVE BROWN NOTE This manual has been written for easy access of information The front and rear panels are graphically illustrated with each control and feature numbered For a description of the function of each control feature simply check the number with the explanations adjacent to each panel Your Laney amplifier has undergone a thorough two stage pre delivery inspection involving actual play testing When you first receive your Laney guitar amplifier follow these simple procedures i Ensure that the amplifier is the correct voltage for the country it is to be used in ii Connect your instrument with a high quality shielded instrument cable You have probably spent considerable money on your amplifier and guitar don t use poor quality cable it won t do your gear justice Please retain your original carton and packaging so in the unlikely event that some time in the future your amplifier should require servicing you will be able to return it to your dea
11. it to a lanes LT 212 Cabinet Page 9 16 QUICK START SETTINGS suggestions only experiment On Off E DRIVE vr Qf sss MIDDLE TREBLE TONE 4 5 6 a g a 54 4 94 6 ahe 4 3545 qe BEER P Nr jm f 2 J 1821 NS 1 i 07 S 1257 1 257 9 E We deu 3437 54 v a 10 4 10 4 10 0 10 0 10 0 49 4 10 0 10 On On INPUT DRIVE bass MIDDLE TREBLE REVERB TONE T 5 5 4 56 56 4m 6 4 9 i Of pu SNC T 3 Ne T Sidi x LIN Ig 7 DD M 2 fj 8 2 9 D 1582 y 17 U ape X q a i0 09 XEM CAP MOS B eU 0 10 D 10 0 10 0 10 0 8 0 10 0 10 INPUT DRIVE per MIDDLE TREBLE REVERB TONE 4 8 4 5 6 9 p pe 36 4 55 4 5 6 7 BRIGHT Vor QU ue Ne pa S 151 2 Bali 82 a2 LE Ts 4675 v 4 1 2 AED JE 9 1 0 10 0 10 0 10 0 10 0 10 07 10 0 10 BLUES LEAD Off On INPUT f MIDDLE TREBLE REVERB TONE eer qne 495g ms 4 5 6 45 4 576 JT 7 BRIGHT wu Mu T DRIVE 3 a 3 N T qe PTT jT 7 1 Y i e N AN far mu JEN gu C O a PIN wi 9 1 1 9 1 7 9 1 g 1 28 1 a fa H
12. l side to it as well making it ideal for any style of playing Perfect for studio and practice use but also equally at home or on stage plugged into a Laney LT 212 cabinet the sound will blow you away The L20H can be secured to the LT 212 Cabinet using the optional fitting kit Every Lionheart product is extensively play tested by experienced guitarists before being shipped to our customers Only when the unit is finished to our complete satisfaction is it assigned its own unique build number which is then hand stamped onto the rear mounted plaque Your L20H s should give you years of trouble free amplification however please take time to read this manual and familiarise yourself with the controls as it will allow you to get the best from your amplifier Ve hope you enjoy using your L20H s as much as we enjoyed designing and making it Best wishes from all at Laney Page 5 16 OPERATING INSTRUCTIONS Laney VV WV WV NW V WV WV WW CLEAN DRIVE C INPUT VOLUME DRIVE VOLUME BASS MIDDLE TREBLE REVERB TONE POWER 3 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 LO 3 7 BRIGHT 3 6 7 DRIVE 3 7 3 7 3 7 3 7 3 7 RUN 2 8 2 8 2 8 E 2 8 2 8 2 82 8 8 vt 2 a e L EL 4 4 e 4 h 4 4 4 4 STANDBY FRONT PANEL CONTROLS HI INPUT Hi stands for high gain This input is designed for the connection of low output level guitars making it well suited for guitars with single coiled or low gain humbucker type
13. ler securely packed Care of your Laney amplifier will prolong it s life and yours Page 4 16 a L e OPERATING INSTRUCTIONS Dear Player Thank you very much for purchasing your new Laney product and becoming part of the worldwide Laney family Each and every Laney unit is designed and built with the utmost attention to care and detail so trust yours will give you many years of enjoyment Laney products have a heritage which stretches back to 1967 when first began building valve amplifiers in my parent s garage Since then we have moved on from strength to strength developing an extensive range of guitar bass public address and keyboard amplification products along with a list of Laney endorsees that includes some of the world s most famous and respected musicians At the same time we believe we have not lost sight of the reason Laney was founded in the first place a dedication to building great sounding amplification for working musicians Warm Regards Lyndon Laney CEO INTRODUCTION The Dark Art In an age where guitar players have developed an unhealthy fascination with pre amp distortion the fabled sound of a tube power amp being pushed hard has almost passed into history Until now that is The L20H s hand wired 20W Class A Single Ended output stage oozes classic warm tube tones The harder you drive it the better it sounds Plus with enough gain for contemporary tones it also has a mean spitefu
14. ne controls Passive controls have the advantage of always sounding musical at any of their settings mainly due to their unique interactive nature This gives players a more natural set of tools to create their ideal sound Try them all set at midway 5 as a good starting point REVERB Controls how loud the built in reverb sounds The reverb in the L20H is a legendary Sound Enhancements aka Accutronics reverb the only choice for that authentic reverb sound TONE The tone control works in a similar fashion to the Tone control you probably have on your guitar except that it uniquely works at the other end of the amplification chain This has the ability to not only control the overall top end response but also reduce upper end harmonics on the output stage and preamplifier overdrive sounds This will give you bright cutting sounds at high settings and smooth rounded sounds at lower settings Midway 5 15 good starting point POWER LED This led will be lit when the amplifier is switched on Always switch off and disconnect the power cord when not in use Se a STANDBY SWITCH Disconnects the main HT voltage from the tubes but keeps the tubes warm so that they are ready to go instantly Switch to standby for short breaks when you don t want to wait for the tubes to warm up again Page 7 16 Laney L20H REAR OPERATING INSTRUCTIONS MAXIMUM POWER CONSUMPTION WARNING CAUTION LOUDSPEAKERS 80 WATTS 50 60Hz THIS APPARATUS MUST
15. ns Directives amp Rules CE Mark 93 68 EEC Low Voltage 72 23 EEC EMC EL RoHS EU2002 95 EC WEEE EU2002 96 EC In order to reduce environmental damage at the end of its useful life this product must not be disposed of along with household waste to landfill sites It must be taken to an approved recycling centre according to the recommendations of the WEEE Waste Electrical and Electronic Equipment directive applicable in your country Page 15 16 POWER TO THE LANEY AMPLIFICATION www laney co uk In the interest of continued product development Laney reserves the right to amend product specification without prior notification The Dark Art
16. pickups Use of high gain pickups in this input may drive the preamp too hard causing a mushy sound Only use good quality guitar cable LO INPUT Lo stands for low gain This input is attenuated down approximately 50 from the Hi input and is designed for high output level guitars It is useful in obtaining output that is tight not mushy from high gain humbucker type pickups Also use this input for the cleanest full range sound with extended low end response Only use good quality guitar cable CLEAN VOL Sets how loud the clean channel is Try cranking it up a little to drive the power tubes harder for that real retro sound and feel that only a quality tube amplifier can deliver Now use your guitar volume to control the amount of distortion Wind it up for distortion back it off a little for clean BRIGHT Adds brightness and life to the treble frequencies of your guitar when on the clean channel Adds edge and picking emphasis when on the drive channel The switch has more effect at low Clean Volume Drive control settings Use in conjunction with the Treble and Tone controls for optimum performance Switch up to enable DRIVE Sets the level of tube preamplifier drive or how dirty your sound is This control should be used in conjunction with the Drive Volume 6 Setting low levels of gain with high levels of volume will give a clean preamplifier sound with tube output stage overdrive Setting a medium drive level and medium Drive Volume
17. presencis de instrucccones importantes sobre la operacion y mantenimiento en la literatura que viene conel producto Riesgo de corrientazo no abra Para disminuir el risego de carrientazo no abra la cubierta No hay piezas adentro que el pueda reparar Deje todo mantenimiento a los tecnicos calificadod ADVERTENCIA Para evitar corrientazos o peligro de incendio no deja expuesto a la VORSICHT VORSICHT ACHTUNG lluvia o humedad este aparato Antes de usar este aparato lea mas advertcias en la guia de operacion Dieses Symbol soll den Anwender vor unsolierten gefahrlichen Spannungen innerhalb des Gehauses warnen die von Ausrichender Starke sind um einen elektrischen Schlag verursachen zu konnen Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam machen die Handhabung und Wartung des Produkts betreffen Risiko Elektrischer Schlag Nicht offen Um das Risiko eines elektrischen Schlages zu vermeiden nicht die Abdeckung enfernen Es befinden sich keine Teile darin die vom Anwender repariert werden Konnten Reparaturen nur von qualifiziertem Fachpersonal durchfuhren lassen Um einen elektrischen Schalg oder Feuergefahr zu vermeiden sollte dieses Gerat nicht dem Regen oder Feuchtigkeit ausgesetzt werden Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen Page 3 16 OPERATING INSTRUCTIONS BEFORE SWITCHING ON After unpacking your amplifier check t
18. t Use the output level control on your FX to control how loud the FX return signal sounds EFFECTS LOOP SEND Connect the input of your external effect to this socket A side chain effects loop allows you to connect external effects such as tremolos chorus and delays to your amplifier Signal leaves the amplifier via the Send socket and comes back from the effects via the Return socket Some Effects are better suited to being between the guitar and amplifer input these are foot pedal types distortion wah wah pedals etc Rack mount effects will work better in the FX loop on the amplifer rear Stomp boxes are normally designed for small signals such as a guitar output whereas rack mount FX are designed for the higher signal level obtained from an FX send FOOTSWITCH SOCKET Provided for the connection of the included Laney FS2 footswitch This allows you to remotely switch between the clean drive channel and switch the built in reverb On Off Lionheart products use only the best available build techniques and components to produce that perfect sound his includes the loudspeakers which are selected for their tonal quality Because these speakers are hand made using vintage style materials which are acknowleged to give the best guitar Set nds they will take several hours of playing to settle down to their optimum sound dE RON The base of the cabinet includes fittings for use with the optional fitting kit to secure the L20H head un
19. t on power supply cords Periodically check cords for cuts or signs of stress especially at the plug and the point where the chord exits the unit 12 The power supply cord should be unplugged when the unit is to be unused for long periods of time 13 If this product is to be mounted in an equipment rack rear support should be provided 14 The user should allow easy access to any mains plug mains coupler and mains switch used in conjunction with this unit thus making it readily operable 15 Metal parts can be cleaned with a damp cloth The vinyl covering used on some units can be cleaned with a damp cloth or ammonia based household cleaner if necessary Disconnect the unit from the power supply before cleaning 16 Care should be taken so that objects do not fall and liquids are not spilled into the unit through any ventilation holes or openings On no account place drinks on the unit 17 A qualified service technician should check the unit if The power cord has been damaged Anything has fallen or spilled into the unit The unit does not appear to operate correctly The unit has been dropped or the enclosure damaged 18 The user should not attempt to service the equipment All service work is done by a qualified service technician 19 Exposure to extremely high noise levels may cause a permanent hearing gloss Individuals vary considerably in susceptibility to noise induced hearing loss but nearly everyone will lose some hearing if exposed to s
20. ufficiently intense noise for a sufficient time The U S Government s Occupational Safety and Health Administration OSHA has specified the following permissible noise level exposure Duration Per Day In Hours Sound Level dBA slow response 8 90 6 92 4 95 3 97 2 100 12 102 105 110 or less 115 According to OSHA any exposure in excess of the above permissible limits could result in some hearing loss Ear plugs protectors in the ear canals or over ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure exceeds the limits set forth above To ensure against potentially dangerous exposure to high sound pressure levels it is recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation SAVE THESE INSTRUCTIONS Page 2 16 A A CAUTION CAUTION WARNING ATTENTION ATTENTION Intended to alert the user to the presence of uninsulated Dangerous Voltage within the products enclosure that may be sufficient to constitute a risk of electrical shock to persons Intended to alert the user of the presence of important operating and maintenance Servicing instructions in the literature accompanying the product Risk of electrical shock DO NOT OPEN To reduce the risk of electrical shock do NOT remove th
21. weeter than solid state transistor amplifiers but they also need a little more respect due to the fragile glass tubes themselves The L20H uses top quality tubes three 12AX7 preamp tubes and four EL84 output tubes which should give you years of trouble free service however like all tube amps it is important to treat it with a certain amount of care Take care when moving the amplifier Tubes are fragile glass components they can easily be damaged if thrown in and out of transit vans e Make sure the impedance of your cabinets matches the setting on your amplifier Improper impedance matching will result in reduced output power output and compromised sound at best and amplifier failure premature tube failure at worst eAllow the amplifier to warm up to room temperature before switching it on The sudden thermal shock generated can crack the cold glass tube housing plus any moisture is bad news around high voltage electronics eAllow the amplifier to cool down after playing before moving Hot tubes are more suseptable to damage than cool ones Use good quality loudspeaker leads cheap leads are often not up to the job of handling the large requirements for loudspeakers and can often short out A tubes life expectancy is based upon a number of factors which include operating temperature how hard and how often it is played vibration due to travel etc Tubes should be changed in your amplifier if you notice any change in your amplifiers performance
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