View User`s Manual [US] - Acoustic Amplification
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1. or in wet conditions e Keep your amplifier free of dirt dust and moisture If the covering of your amplifier requires cleaning use a light soapy solution on a damp cloth Avoid getting liquid inside the amplifier or on the control panel surfaces e Avoid rough handling dropping or extreme vibration to your amplifier e Always take care when transporting your amplifier e Do not block the vent openings of your amplifier This can cause the amplifier to overheat e If you notice a change in the performance of your amplifier take it to a qualified service professional to diagnose the operating condition of the amplifier and the tubes e Tube life varies based on the frequency duration and level of use Tubes require replacement from time to time to maintain top performance of your amplifier If you are not sure about the operating condition of your tubes take the amplifier to a qualified professional for evaluation of the condition of the tubes www acousticamplification com Here are some recommendations that will help you get the most out of the GT50H e Do not try to service or modify your amplifier yourself This will void the warranty and presents danger of electrocution There are no user serviceable parts inside e Always unplug your amplifier from the wall power source when not in use e Always have your tubes replaced by a qualified professional e Never operate your amplifier without a speaker cabinet connect2. or smaller performance venues to reduce the volume of the amplifier while maintaining the tone and allows the user to push the power tubes to full saturation at a lower level TRIODE PENTODE SWITCH Switching between Triode and Pentode changes the operating mode of the power tubes in your GT50H Triode mode will give a darker tone and earlier breakup of the power tubes Pentode mode give a crisper brighter tone with less breakup of the power tubes Triode mode also reduces the power output of the GT50H by about half and can be used in conjunction with the half power transformer switch For Example If the GT50H is set to half power on the transformer switch 25 watts and set to Triode mode the amplifier is effectively running at about 12 5 watts This can also be very useful in small performance venues rehearsals and recording situations Experiment with combinations of transformer power settings and Triode Pentode settings to find the tone amp volume settings that work best for you CAUTION The Standby switch should be turned to the off position when changing the position of the Half Power Transformer switch or the Triode Pentode switch in order to protect the amplifier and extend the life of the tubes LEAD VOLUME COSS PRESENCE REVERB Dil boost the bass and treble controls Fine adjustment of all three tone controls will give you access to a wide variety of heavy tones Increasing the midrange will make
3. profits downtime goodwill damage to or replacement of equipment and property and any costs of recovering reprogramming or reproducing any program or data stored in equipment that is used with Acoustic products This guarantee gives you specific legal rights You may have other legal rights which vary from state to state Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you All trademarks and registered trademarks mentioned herein are recognized as the property of their respective holders 1109 9659 www acousticamplification com 2 GT50H FRONT PANEL INPUT 10 11 CLEAN VOLUME o My BRIGHT NORMAL SWITCH GAIN BASS TREBLE NORMAL Tube Lead Series GUITAR INPUT 1 4 two conductor jack CLEAN VOLUME Adjusts the relative volume of the clean channel Enhances the high frequencies on both the Clear and Lead channels when switched to the Bright position HIGH GAIN LOW GAIN This switch increases the preamp gain level on both the Clean and Lead channels when switched to the High Gain position GAIN This control increases or decreases the gain level on the Lead channel BASS This control increases or decreases bass frequencies for both channels MID This control increases or decreases mid range frequencies for both channels TREBLE This control increases or decreases treble frequencies fo
4. ODE PENTODE SWITCH Use this switch to select 12 Speaker Jacks for 1 8 Ohm Cabinet or Triode or Pentode mode for the tubes CAUTION The 2 16 Ohm cabinets amplifier should be switched to STANDBY before changing the Triode Pentode setting 13 Speaker Jack for 1 16 Ohm cabinet 6 BOOST LEVEL This adjust the level of the Boost CAUTION Do not operate the GT50H without a speaker Function when engaged This acts as a Lead cabinet attached to the appropriate speaker jack Boost of up to 15dB This function can only be Operating the GT50H without a speaker attached or with accessed and turned on with the included GFS4 speakers attached to the wrong Ohm rating jacks can footswitch attached damage the amplifier Minimum Ohm load for the GT50H is 4 Ohms Damage to the GT50H caused by operation 7 FOOTSWITCH JACKS Connection for the GFS4 4 without a speaker cabinet attached or by improper Ohm button footswitch included via a 2 stereo 1 4 cables Joad matching is NOT covered under warranty included Switches Clean Lead channel High Low Gain Reverb On Off amp Boost On Off 8 EFFECTS LOOP SEND Accepts 1 4 instrument connectors www acousticamplification com 4 acoustic SUGGESTED TONE SETTINGS Modern guitar players use a wide variety of tones The following setting suggestions will serve as a starting point to help you find these tones for different styles of music Don t be afraid to experiment and
5. acoustic GT50H OWNER S MANUAL www acousticamplification com IMPORTANT SAFETY INSTRUCTIONS Exposure to high noise levels may cause permanent hearing loss Individuals vary considerably to noise induced hearing loss but nearly CAUTION everyone will lose some hearing if exposed to sufficiently intense noise ee over time The U S Government s Occupational Safety and Health Administration CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO se z A 3 NOT REMOVE CHASSIS NO USER SERVICEABLE OSHA has specified the following permissible noise level exposures PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL DURATION PER DAY HOURS 8 6 4 3 2 1 According to OSHA any exposure in the above permissible limits could result in some hearing loss Hearing protection SOUND LEVEL dB 90 93 95 97 100 103 must be worn when operating this amplification system in Nan auna po 10 11 12 13 14 15 16 gt gt gt order to prevent permanent hearing loss This symbol is intended to alert the user to the presence of non insulated dangerous voltage within the product s enclosure This symbol is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the unit Apparatus shall not be exposed to dripping or splashing Objects filled with liquids such as vases shall not be placed on the apparatus T
6. ed via an appropriate speaker cable not instrument cable to the speaker cabinet e Never operate your amplifier at an Ohm load below 4 Ohms e Always place your amplifier in Standby mode before turning it on off changing the setting of the Half Power transformer switch or the Triode Pentode switch e When in doubt have your amplifier evaluated by a qualified professional
7. he apparatus shall not be exposed to dripping or splashing Objects filled with liquids such as vases shall not be placed on the apparatus l appareil ne doit pas tre expos aux coulements ou aux claboussures et aucun objet ne contenant de liquide tel qu un vase ne doit etre plac sur l objet The main plug is used as disconnect device The main plug of apparatus should not be obstructed OR should be easily accessed during intended use To be completely disconnected from the power input the main plug of apparatus shall be disconnected from the mains La prise du secteur est utilis pour d connecter le syst me La prise du secteur ne doit pas tre obstru e ou doit etre facilement acces sible pendant son utilisation Pour amp tre completement d connect de l alimentation d entree la prise doit amp tre d branch e du secteur An appliance with a protective earth terminal should be connected to a mains outlet with a protective earth connection Un appareil avec la borne de terre de protection doit etre connect au secteur avec la connexion de terre de protection WARNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Avertissement pour r duire le risque d incendie ou de choc lectrique ne pas exposer cet appareil sous la pluie et l humidit Read all safety and operating instructions before using this product All safety and operating instructions should be kept for future refe
8. o blo 250V T 500mA slo blo 250V T 5A slo blo H 10 83 x D 10 69 x W 29 35 61 Ibs Power Tubes Mains Fuse Anode Fuse Heater Fuse Dimensions Weight Three Year Limited Warranty Subject to the limitations set forth below Acoustic hereby represents and warrants that the components of this product shall be free from defects in workmanship and materials including implied warranties of merchantability or fitness for a particular purpose subject to normal use and service for three 3 years to the original owner from the date of purchase Thirty 30 Day Limited Warranty Tubes Subject to the limitations set forth below Acoustic hereby represents and warrants that any tube components of this product shall be free from defects in materials and workmanship including implied warranties of merchantability or fitness for a particular purpose subject to normal use and service for thirty 30 days to the original owner from the date of purchase For information on warranty replacement tubes please visit http acoustic custhelp com app ask Acoustic P O Box 5111 Thousand Oaks CA 91359 5111 CAUTION Replace fuses with IEC type 127 5x20 mm and specified rating only Retailer and manufacturer shall not be liable for damages based upon inconvenience loss of use of product loss of time interrupted operation or commercial loss or any other incidental or consequential damages including but not limited to lost
9. od of time Care should be taken so that objects do not fall and liquids are not spilled into the unit through the ventilation ports or any other openings Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way When a mains plug is used as the disconnect device the disconnect device shall remain readily operable 53125A www acousticamplification com gt acoustic GT5OH OWNER S MANUAL WELCOME Congratulations on your purchase of a new Acoustic electric guitar tube amplifier Founded as the Acoustic Control Corporation in Van Nuys California in 1967 Acoustic is the rig of choice for many legendary touring musicians If you re new to Acoustic amps we encourage you to get in tune with its rich heritage at Your comments are important We constantly improve our products based on feedback from musicians like you Please feel free to contact us at www acousticamplification com or send us an email at info acousticamplification com Welcome to Acoustic the Pro s Tone Since 1967 www acousticamplification com history cfm SPECIFICATIONS Model GT50H Power 50 Watts Maximum into 4 8 or 16 ohms Equalizer 3 Band Bright switch and Presence control Channels 2 High Low Gain switch and Boost Control Effects Accutronics Spring Reverb Effects Loop Preamp Tubes 2 x ECC83S 2 x 12AX7WB 2 x 5881 6L6WGC 250V T 3 15A sl
10. r both channels LEAD VOLUME This control adjusts the relative volume of the Lead channel PRESENCE This control adjusts the upper frequencies when the Lead Channel is selected high LEAD CLEAN Switches between the Lead and Clean Channels www acousticamplification com acoustic DONA 000 0000000 000 000 12 13 14 15 16 PRESENCE REVERB MASTER sow PENTODE STANDBY GTson POWER CLEAN 25W PENTODE 12W TRIODE REVERB This control adjusts the level of the spring reverb effect MASTER This control adjusts the overall volume of the amplifier HALF POWER SWITCH This switch reduces the power transformer output level to half power without changing the sound of the amplifier Switch between 50 watts and 25 watts when in Pentode mode Switch between 25 watts and 12 5 watts when in Triode mode CAUTION The amplifier should be switched to STANDBY before changing the transformer power switch setting STANDBY The Standby switch is used in conjunction with the Power switch on tube amplifiers The Standby switch should be left in the off position for 2 3 minutes after turning the Power switch on This allows the tubes to come up to operating temperature and will extend the life of the tubes The Standby switch should be turned to the off position before turning the Power switch off The Standby switch can be used to turn off sound from the amplifier while keeping the tubes at operating
11. rence Read and understand all warnings listed on the operating instructions Follow all operating instructions to operate this product This product should not be used near water i e bathtub sink swimming pool wet basement etc Only use dry cloth to clean this product Do not block any ventilation openings it should not be placed flat against a wall or placed in a built in enclosure that will impede the flow of cooling air Do not install this product near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Do not break the ground pin of the power supply cord Only use attachments specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used exercise caution when moving Unplug this apparatus during lightning storms or when unused for a long peri
12. temperature Finally the Standby switch should be turned to the off position when changing the position of the Half Power switch or the Triode Pentode switch in order to protect the amplifier and extend the life of the tubes POWER Turns the power on and off GT50H USER S MANUAL LEAD SERIES GUITAR AMPS GT50H REAR PANEL FUSE TRIODE_ PENTODE FOOT FX LOOP SWITCH non som TRIODE PENTODE CAUTION E za ENSURETHE DEVICE IS DISCONNECTED 5 y BOOST CHANNEL REVERB SEND RETURN ROM THE MAINS BEFORE REPLACING chan Koma E5 4 1 a THE FUSE ONLY USE FUSES OF THE SERIAL NO OR OR 80HM amp 80HM 160HM amp 16 0HM SAMETYPE AND RATING A 3 00000 O 000 1 AC INPUT Attach the included AC power cable here 9 EFFECTS LOOP RETURN Accepts 1 4 instrument connector 2 MAINS FUSE Contains the fuse for the amplifier mains Replace with the same type and value only 10 EFFECTS LOOP MIX CONTROL Blends the parallel effect loop signal with the main dry signal when an 3 HEATER FUSE Contains the heater fuse for the preamp external effect is connected via the effects loop This and power amp tubes Replace with the same type and should be set to the Dry position when no external value only effect is connected 4 ANODE FUSE Contains the anode fuse for the power 11 Speaker Jacks for 1 4 Ohm cabinet or tubes Replace with the same type and value only 2 8 Ohm cabinets 5 TRI
13. the guitar cut through better for leads while pulling out mid range will give you the extreme scooped sound popular in the heaviest of heavy metal styles MASTER sow PENTODE STANDBY ome O ey To y 25W PENTODE 12W TRIODE POWER uno amp CLEAN BOOST FUNCTION The GT50H has a Boost function that can be accessed through the GFS4 footswitch and controlled by the Boost Level control on the rear panel of the GT50H The boost function is effectively a variable lead boost For best results set the Master volume level high and the Clean and Lead channel volumes at the appropriate volume When the boost function is engaged it gives up to an additional 15dB of volume which can be useful for making lead guitar parts and solos cut through when playing with a band Adjusting the Boost Level control on the rear panel of the GT50H varies the amount of additional volume 6 www acousticamplification com acoustic CARE RECOMMENDATIONS Tube amplifiers are more sensitive than solid state amplifiers Extra care will extend the life of your GT50H and the life of your tubes and ensure top performance e When moving your amplifier from a cold environment to a warm environment condensation can occur inside the amplifier Always allow your amplifier to acclimate to room temperature before operation e Do not operate your amplifier in extreme hot or cold
14. tweak the controls INPUT CLEAN GAIN BASS TREBLE VOLUME NORMAL Tube Lead series CLEAN Clean Channel These settings are good for clean sounds including rhythm guitar country lead guitar and funk rhythm sounds Country and Funk sounds generally call for a brighter more treble edged setting This setting INPUT CLEAN GAIN BASS VOLUME CN 31 NORMAL Tube Lead series TREBLE MEDIUM GAIN ROCK amp BLUES Lead Channel This setting is useful for blues or classic rock songs Medium gain works well for leads rhythm parts and power chords The Lead channel must be selected to engage the gain control for distortion Blues music calls for lower gain INPUT CLEAN GAIN BASS VOLUME TREBLE AD 71 NORMAL Tube Lead series ALTERNATIVE HARD ROCK Lead Channel For both rhythm and lead sounds this setting will give you a fat distortion sound If you need more crunch increase the gain control for more distortion These styles of music www acousticamplification com LEAD PRESENCE VOLUME DADADD LEAD PRESENCE VOLUME DADRA LEAD PRESENCE VOLUME SEITE to get the most out of your lead guitar amplifiers If a particular control setting is not shown then it doesn t apply to the sound setting REVERB ASI MASTER sow PENTODE STANDBY 25W TRIODE POWER CLEAN 25W PENTODE 12W TRIODE GTSOH sounds great with single coil pickups Rhythm guitar is commonly a clean full so
15. und using a little less treble than the country or funk sound and a bit more midrange Humbucking pickups will create a fatter sound MASTER sow PENTODE STANDBY DIM osm REVERB POWER 25W PENTODE 12W TRIODE settings and a bit more treble Classic rock uses more gain bass and midrange Adjust the gain dial to the amount of distortion you desire Increasing the Treble will help you cut through the band MASTER 50W PENTODE STANDBY 25W TRIODE POWER GTSOH REVERB Da CLEAN 25W PENTODE 12W TRIODE require a thick harder edged tone that fills out the band s sound Adding more gain will increase thickness and sustain Increasing the bass and decreasing the mids will give you a slightly fatter low end GT50H USER S MANUAL LEAD SERIES GUITAR AMPS INPUT CLEAN VOLUME Min NORMAL GAIN BASS MID TREBLE Tube Lead series HEAVY METAL MAXIMUM GAIN Lead Channel Modern Heavy Metal is known for high gain distortion and a signature scooped midrange sound Start with the Gain control at maximum and the High Gain switch engaged This gives you full distortion Next reduce the mid frequency level If you really want a more intense scooped sound roll back the mid control all the way and SPECIAL FEATURES POWER TRANSFORMER SWITCH The half power transformer switch literally switches the GT50H between full power 50 watts and half power 25 watts This feature is useful in rehearsal
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