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Ampeg GVT52-112 50W 1x12 Elektro Gitar Amfisi manul akullanim klavuzu
- 2. IMPORTANT SAFETY INSTRUCTIONS 1. Read these instructions. 15. Do not overload wall outlets and extension cords as this can result in a risk of fire or electric shock. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 9. 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. 16. This apparatus shall not be exposed to dripping or splashing, and no object filled with liquids, such as vases or beer glasses, shall be placed on the apparatus. 17. This apparatus has been designed with Class-I construction and must be connected to a mains socket outlet with a protective earthing connection (the third grounding prong). 18. The MAINS plug or an appliance coupler is used as the disconnect device, so the disconnect device shall remain readily operable. 19. For the terminals marked with symbol of “ ” may be of sufficient magnitude to constitute a risk of electric shock. The external wiring connected to the terminals requires installation by an instructed person or the use of ready-made leads or cords. 10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Only use attachments/accessories specified by the manufacturer. 12. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/ apparatus combination to avoid injury from tip-over. PORTABLE CART WARNING CAUTION CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE. AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE. AVIS: POUR EVITER LES RISQUES D'INCENDIE OU D'ELECTROCUTION, N'EXPOSEZ PAS CET ARTICLE A LA PLUIE OU A L'HUMIDITE The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure, that may be of sufficient magnitude to constitute a risk of electric shock to persons. Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral est utilisé pour alerter l'utilisateur de la présence à l'intérieur du coffret de "voltage dangereux" non isolé d'ampleur suffisante pour constituer un risque d'éléctrocution. The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé pour alerter les utilisateurs de la présence d'instructions importantes pour le fonctionnement et l'entretien (service) dans le livret d'instruction accompagnant l'appareil. 13. Unplug this apparatus during lightning storms or when unused for long periods of time. 14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. AVIS RISK OF ELECTRIC SHOCK. DO NOT OPEN RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR WARNING — To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE directive (2002/96/EC) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service. ® GVT52-112 2 ™ Guitar Amplifier
- 3. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: ATTENTION — Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant las limites applicables aux appareils numériques de class A/de class B (selon le cas) prescrites dans le réglement sur le brouillage radioélectrique édicté par les ministere des communications du Canada. • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and the receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. According to OSHA, any exposure in excess of these permissible limits could result in some hearing loss. 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 use hearing protectors while the equipment is in operation. Ear plugs or protectors in the ear canals or over the ears must be worn when operating the equipment in order to prevent permanent hearing loss if exposure is in excess of the limits set forth here: Exposure to extremely high noise levels may cause permanent hearing loss. Individuals vary considerably in susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently intense noise for a period of time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the permissible noise level exposures shown in the following chart. CAUTION: Changes or modifications to this device not expressly approved by LOUD Technologies Inc. could void the user's authority to operate the equipment under FCC rules. Duration, per day in hours This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications. 8 6 4 3 2 1.5 1 Sound Level dBA, Slow Response 90 92 95 97 100 102 105 CONSIGNES DE SECURITE IMPORTANTES 0.5 0.25 or less 110 115 - LIRE, SUIVRE TOUTES LES INSTRUCTIONS ET LES PRECAUTIONS D’UTILISATION Typical Example Duo in small club Subway Train Very loud classical music The boss screaming at the minions about manual deadlines Loudest parts at a rock concert - NE PAS UTILISER PROCHE D’UNE SOURCE DE CHALEUR ET NE PAS BLOQUER OU OBSTRUER LE SYSTEME DE VENTILATION SUR CET APPAREIL. POUR UNE UTILISATION CONFORME, CET APPAREIL NECESSITE ENVIRON 7CM D’ESPACE BIEN VENTILE AUTOUR DE SON SYSTEME DE REFROIDISSEMENT, AINSI QU’UN COURANT D’AIR FRAIS CONSTANT - NE PAS UTILISER CET APPAREIL PROCHE D’UNE SOURCE LIQUIDE - NETTOYER SEULEMENT A L’AIDE D’UN CHIFFON DOUX ET SEC ET NE PAS UTILISER DE PRODUITS MENAGERS - CONNECTER UNIQUEMENT LE CABLE D’ALIMENTATION FOURNI SUR UNE PRISE AVEC MISE A LA TERRE, ET COMPATIBLE AVEC LA TENSION, L’INTENSITE ET LA FREQUENCE REQUISES INDIQUEES SUR LA FACE ARRIERE DE L’APPAREIL - S’ASSURER DE NE PAS MARCHER, PLIER OU TIRER SUR LE CABLE D’ALIMENTATION - DEBRANCHER L’APPAREIL LORS D’UNE TEMPETE OU LORS D’UNE TRES LONGUE PERIODE DE NON UTILISATION - UTILISER UNIQUEMENT DES ACCESSOIRES SPECIFIES PAR LE FABRICANT POUR UNE UTILISATION EN TOUTE SECURITE ET POUR EVITER DES BLESSURES - ATTENTION: AFIN DE PREVENIR TOUT RISQUE DE CHOCS ELECTRIQUES OU DE DEBUT D’INCENDIE, NE PAS EXPOSER CET APPAREIL A LA PLUIE ET A L’HUMIDITE - TOUT ENTRETIEN DOIT ETRE FAIT PAR UN TECHNICIEN QUALIFIE - NOS AMPLIFICATEURS PEUVENT PRODUIRE DE TRES HAUTES PRESSIONS ACOUSTIQUES QUI PEUVENT CAUSER DES DOMMAGES AUDITIFS PERMANENTS OU DEFINITIFS. L’UTILISER AVEC UNE GRANDE PRECAUTION EST CONSEILLE ET DES PROTECTIONS AUDITIVES SONT RECOMMANDEES POUR UNE UTILISATION A FORT VOLUME. - ATTENTION: CET APPAREIL REQUIERT UNE PRISE MURALE AVEC MISE A LA TERRE, AUX NORMES ACTUELLES ET COMPATIBLE AVEC LES SPECIFICATIONS ELECTRIQUES SE TROUVANT EN FACE ARRIERE DE L’APPAREIL. LA PRISE ELECTRIQUE DOIT RESTER ACCESSIBLE POUR DEBRANCHER L’APPAREIL EN CAS DE DEFAUT PENDANT L’UTILISATION - CET APPAREIL DOIT ETRE DEBRANCHE SI IL N’EST PAS UTILISE Elimination correcte du produit : Ce symbole indique que ce produit ne doit pas être éliminé avec les ordures ménagères, comme le prévoiT la directive WEEE (2002/96/ EC) et votre loi nationale. Ce produit doit être remis à un site de recyclage des déchets électriques et des équipements électroniques (EEE). Un mauvais recyclage de ce type de déchet peut avoir de possibles impacts négatifs sur l’environnement et la santé humaine dus aux émanations de substances. Dans un même temps, votre coopération à un recyclage correct de ce produit contribuera à la bonne utilisation des ressources naturelles. Pour connaître l’endroit où il est possible de recycler ces équipements, merci de contacter votre mairie, les services de recyclages ou le service des déchets ménagers. ® Guitar Amplifier ™ GVT52-112 3
- 4. TABLE OF CONTENTS Important Safety Instructions..............................................2–3 Introduction...........................................................................4 Special Features....................................................................5 The Front Panel – Channel 1...................................................6 The Front Panel – Channel 2...................................................7 The Rear Panel..................................................................8–9 Important Information about Tubes..................................10–12 Block Diagram.....................................................................13 Technical Specifications........................................................14 Service Information..............................................................15 Introduction Ampeg has a history of delivering pure all-tube tone for over 60 years. During that time we’ve made great friends and damaged some ear drums. We’ve seen it all, lived it all and lived to talk about it. The backbone of American Rock is back. Become a part of the American tone invasion with the all-new Ampeg GVT Series that delivers all-tube tone force that will set you apart from the rest. Are you ready to experience the taste, smell and tone that is American Rock? Buckle your seat belt, plug in, turn on and turn up. It’s time to make history! On a personal note, the team at Ampeg would sincerely like to thank you for your support and dedication to our mission in bringing you some of the best amps and cabs the world has known. Best of luck in all of your musical endeavors! Sincerely, The dedicated team at Ampeg ® GVT52-112 4 ™ Guitar Amplifier
- 5. Special Features • Dual Channel, All-Tube Circuit Path, Push-Pull, Class AB • Power Output: 50W Full Power / 25W Half Power • Preamp Tubes: 3 x 12AX7 / ECC83 / 7025 • Power Tubes: 2 x 6L6GC • Rectifier: Solid State • Channel 1: Voiced for low to moderate gain tones. Ideal for clean, crunchy rhythm and old school lead tones • Channel 2: Voiced for moderate to high gain tones. Ideal for heavy crunch and modern overdrive lead tones • Controls: Gain, Treble, Middle, Bass, Volume, Reverb and Master Volume (Post FX Loop) • Full Power (50W – Tetrode), Standby, Half Power (25W – Triode) Switch • Channel Switching: Footswitchable channel switching with additional global gain and level boost • Spring Reverb: Footswitchable with hard bypass in off position • Effect Loop: Footswitchable with hard bypass in off position • Custom Designed 12" Celestion Speaker • Baxandall EQ • DC power to filament supply for super quiet operation • Heritage trim: black-line face plate, black sparkle grille cloth and black Tolex • Premium Tubes • Dual Color Indicator Light • 2 Button Foot Switch: Ch. 1/Ch. 2 and Gain and Level Boost On/Off [Included] • 2 Button Foot Switch: Reverb and Effect Loop On/Off [Accessory Item] • Speaker Outputs: 1 x 16 Ω, 2 x 8 Ω and 2 x 4 Ω • Cabinet Construction: Void-Free 15 mm thick plywood • Cabinet Dimensions: 19.5 in/496 mm (with feet) x 24.0 in/610 mm x 11.0 in/280 mm : handle adds 0.75 in/19 mm to H • Handling Weight: 52.2 lb / 23.7 kg (approximately) ® Guitar Amplifier ™ GVT52-112 5
- 6. The Front Panel – Channel 1 1 2 3 The gain, treble, middle, bass and volume knobs as seen above and mentioned below [#2 – #6] are for channel 1 only. See the next page for the channel 2 illustration and descriptions. 1. INPUT: Connect a guitar to this 1/4" input using a high-quality shielded instrument cable. 2. GAIN: This control adjusts the gain of the amplifier. 3. TREBLE: Use this to adjust the high frequency level of the amplifier. This provides up to 12 dB of boost or 12 dB of cut at 5 kHz. The high frequency output is flat at the center position. 4 5 6 7 5. BASS: Use this to adjust the low frequency level of the amplifier. This provides up to 12 dB of boost or 12 dB of cut at 80 Hz. The low frequency output is flat at the center position. 6. VOLUME: This control adjusts the output level. 7. CHANNEL SELECTOR SWITCH: This switch determines if channel 1 [switch to the left] or channel 2 [switch to the right] is in effect. There are two LEDs above the switch. The LED on the left will illuminate green when channel 1 is selected and the LED on the right will illuminate red when channel 2 is selected. 4. MIDDLE: Use this to adjust the middle frequencies of the amplifier. This provides up to 10 dB of boost @ 2 kHz or up to 6 dB of cut at 800 Hz. ® GVT52-112 6 ™ Guitar Amplifier
- 7. The Front Panel – Channel 2 8 9 10 11 12 The gain, treble, middle, bass and volume knobs as seen above and mentioned below [#8 – #12] are for channel 2 only. See the previous page for the channel 1 illustration and descriptions. 8. GAIN: This control adjusts the gain of the amplifier. 9. TREBLE: Use this to adjust the high frequency level of the amplifier. This provides up to 12 dB of boost or 12 dB of cut at 5 kHz. The high frequency output is flat at the center position. 10. MIDDLE: Use this to adjust the middle frequencies of the amplifier. This provides up to 10 dB of boost @ 1 kHz or up to 6 dB of cut at 800 Hz. 11. BASS: Use this to adjust the low frequency level of the amplifier. This provides up to 12 dB of boost or 12 dB of cut at 80 Hz. The low frequency output is flat at the center position. 12. VOLUME: This control adjusts the output level. 13. REVERB: This control adjusts the amount of reverb. With the control fully counter-clockwise, there is no reverb applied; as the control is turned clockwise, the amount of reverb increases accordingly. 13 14 15 16 17 14. MASTER: This control adjusts the signal level to the power amp, and therefore the overall output level. 15. FULL/STANDBY/HALF: The amplifier may be utilized in two distinct modes of operation and output power rating. Tetrode is the aggressive setting that delivers full output power of 50 watts rms [setting at FULL]. Triode is a gentler setting with more headroom that reduces the output power to 25 watts rms [setting at HALF]. lways make sure this switch is in A STANDBY mode [middle position] when powering the GVT52-112 ON or OFF [17]. Allow at least 30 seconds before moving this switch to FULL or HALF. During short breaks, this switch should be set to STANDBY to help prolong the life of the amplifier’s tubes. 16. STANDBY/POWER LED: This is a multi-function LED. In STANDBY mode, it glows red. In the ON mode (when the high voltage kicks in) it glows green. If it does not turn green in the ON mode, there is no high voltage present and the unit needs to be serviced. 17. POWER SWITCH: Use this switch to turn the overall system power on or off. Always turn this switch ON first and OFF last! Turn the Full/Standby/Half switch [15] on at least 30 seconds after turning on the On/Off switch. ® Guitar Amplifier ™ GVT52-112 7
- 8. The Rear Panel 18 19 20 21 22 18. AC POWER INPUT: The amplifier is equipped with a detachable power cable that plugs into the IEC Mains socket on the back of the amplifier. The AC power cord should only be plugged into a grounded power outlet that meets all applicable electrical codes and is compatible with the voltage, power, and frequency requirements stated on the rear panel of the amplifier. Do not attempt to defeat the safety ground connection. 23 Never bypass the fuse or replace it with a wrong type or value. 20. CH SELECT/BOOST FOOT SWITCH: Connect the GVT–FS1 dual foot switch to this jack for “remote control” of Channel Selection and Boost On/Off. On the stereo 1/4" plug, the tip controls Channel Selection and the ring controls Boost. 25 26 21. REVERB/EFFECTS LOOP FOOT SWITCH: Connect the GVT–FS2 dual foot switch to this jack for “remote control” of Reverb and Effects On/Off. On the stereo 1/4" plug, the tip controls Reverb and the ring controls Effects. When the foot switch is NOT plugged in: The Reverb is always enabled. The Effects Loop is active when a cable is connected to the Return [22]. When the foot switch IS plugged in: The Reverb is always affected by the foot switch operation. The Effects Loop is controlled by the foot switch when a cable is connected to the Return [22]. The foot switch button for Effects Loop does nothing when no cable is connected to the Return [22]. 19. AC MAINS FUSE: The AC Mains fuse is used to protect the amplifier from electrical faults. It is located in the fuse holder cap and should be left alone unless a fuse has blown. If the fuse needs to be replaced, please refer to the correct fuse specifications located on the back panel of the amplifier. 24 NOTE: A foot switch may be purchased at your local Ampeg dealer or ordered directly from LOUD Technologies Inc. Be sure to ask for model #GVT–FS2. 22. EFFECTS LOOP RETURN: Use this 1/4" TS unbalanced input to return the processed line-level output of an external effects processor (for example). The processor could be fed signals from the Effects Loop Send [23]. NOTE: A foot switch may be purchased at your local Ampeg dealer or ordered directly from LOUD Technologies Inc. Be sure to ask for model #GVT–FS1. ® GVT52-112 8 ™ Guitar Amplifier
- 9. The Rear Panel continued... 18 19 20 21 22 23 24 25 26 23. EFFECTS LOOP SEND: Use this 1/4" TS unbalanced output to send a line-level output to an external effects processor (for example). The output here is affected by all controls except the Volume [6, 12]. Use the Effects Loop Return jack [22] to feed the returned processed signals back into the amplifier. WARNING! Never turn on or use the amplifier without a load or speaker connected to the amplifier. ALWAYS use a good quality (non-shielded) speaker cable. Never use (shielded) instrument cable. ALWAYS match the amplifier’s speaker output impedance to the impedance of the speaker that is being used. Use only one type impedance output at a time. If more than one speaker is connected at the same time, make sure they all have the same impedance rating. Never use two or more cabinets with different impedance ratings. This will create an unbalanced load. When using multiple speaker cabinets (with the same impedance rating), match the total load impedance of the speaker cabinets to the speaker output of the amplifier. SPEAKER CABINET IMPEDANCE divided by NUMBER OF CABINETS = TOTAL LOAD 16 Ω cabs with parallel inputs / 4 cabs = 4 Ω load. For this application use 4 Ω output jacks. 16 Ω cabs / 2 cabs = 8 Ω load. For this application use the 8 Ω speaker jacks. 16 Ω cab / 1 cab = 16 Ω load. For this application use the 16 Ω speaker jack. 8 Ω cabs / 2 cabs = 4 Ω load. For this application use the 4 Ω output jacks. 8 Ω cab / 1 cab = 8 Ω load. For this application use the 8 Ω speaker jack. 4 Ω cab / 1 cab = 4 Ω load. For this application use the 4 Ω speaker jack. 24. 4 OHMS: The two 4 Ω speaker output jacks are wired in parallel. Use a single jack when using one 4 Ω speaker cabinet. Use both speaker jacks when using two 8 Ω speaker cabinets. If you have four 16 Ω cabinets with parallel speaker jacks, you can link all four 16 Ω cabinets in a parallel wiring configuration, totaling a 4 Ω load. 25. 8 OHMS: The two 8 Ω speaker output jacks are wired in parallel. Use a single jack when using one 8 Ω speaker cabinet. Use both speaker jacks when using two 16 Ω speaker cabinets. 26. 16 OHMS: The 16 Ω speaker output jack is designated for 16 Ω speaker cabinets only. ® Guitar Amplifier ™ GVT52-112 9
- 10. Important Information about Tubes: The Nature Of Tubes — Why (And When To) Replace Them: Tubes are made up of a number of fragile mechanical components that are vacuum-sealed in a glass envelope or bubble. The tube’s longevity is based on a number of factors which include how hard and often the amplifier is played, vibration from the speakers, road travel, repeated set up and tear down, etc. Any time you notice a change in the amplifier’s performance, check the tubes first. If it’s been awhile since the tubes were replaced and the amplifier lacks punch, fades in and out, loses highs or lows or produces unusual sounds, the power tubes probably need to be replaced. If the amplifier squeals, makes noise, loses gain, starts to hum, lacks “sensitivity”, or feels as if it is working against you, the preamplifier tubes may need to be replaced. The power tubes are subjected to considerably more stress than the preamplifier tubes. Consequently, they almost always fail/degrade first. If deteriorating power tubes aren’t replaced, they will ultimately fail. Depending on the failure mode, they may even cause severe damage to the audio output transformer and/or other components in the amplifier. Replacing the tubes before they fail completely has the potential to save time, money and other unwanted trouble. Since power tubes work together in an amplifier, it is crucial that they (if there is more than one) be replaced by a matched set. If you’re on the road a lot, we recommend that you carry a spare matched set of replacement power tubes and their associated driver tubes. After turning off the power and disconnecting the amplifier from the power source, carefully check the tubes (in bright light) for cracks or white spots inside the glass or any other apparent damage. Then, with the power on, view the tubes in a dark room. Look for preamplifier tubes that do not glow at all or power tubes that glow excessively red. ® GVT52-112 10 ™ Guitar Amplifier
- 11. Important Information About Tubes (continued): Changing the Tubes: To get to the power tubes, the rear screen must be removed and the tube retainer(s) must be moved out of the way. Qualified service persons may follow these steps to change the tubes: • Turn the amp off, unplug it and let it cool for at least 5 minutes. • Remove the screws which hold the perforated metal screen to the rear of the cabinet. • Set the perforated metal screen aside. • Remove the tube retainer(s) by pulling them off the tube(s) and moving them to one side. • Grasp the tube at its top and gently work it out of its socket by rocking it slightly back and forth as you pull down on it. • When inserting new output tubes, align the tab in the tube’s plastic base with the slot in the socket and press the tube gently but firmly into place by pushing up on its top. • Replace the back panel and tighten its screws. • Power up the amplifier and let it sit for at least 20 minutes. Bias the amplifier per the schematic (qualified technicians only!). Whenever you replace the power tube(s): Check the preamplifier tubes for microphonics by turning the amplifier on, turning up the gain and tapping lightly on each tube with the end of a pencil or a chopstick (my favorite). You will be able to hear the tapping through the speakers, which is normal. It is not normal for a tube to ring like a bell after it’s tapped. If it does ring, then it’s microphonic and should be replaced. Remember to use only high-quality, low microphonic tubes in the preamplifier section. Even though power tubes are rarely microphonic, they should be checked, anyway. Power tubes may be checked for microphonics in the same fashion as the preamp tubes. The amount of noise generated in very high gain amps may be reduced simply by swapping the preamp tubes around. ® Guitar Amplifier ™ GVT52-112 11
- 12. Important Information About Tubes (continued): Survival Tips for Tube Amplifiers: To prolong tube life, observe the following tips and recommendations: • Match the impedance of the speaker cabinet(s) to the amplifier. Improper impedance matching will contribute to early tube degradation and may cause premature tube failure. • Make sure the speaker(s) are properly connected prior to turning on the amplifier. • Allow sufficient time for the amplifier to properly cool down prior to moving it. A properly cooled amplifier prolongs tube life due to the internal components being less susceptible to the damage caused by vibration. • Allow the amplifier to warm up to room temperature before turning it on. The heat generated by the tube elements can crack a cold glass housing. • Replace the output tube(s) before the performance degrades or the tubes fail completely. Replace the tube(s) at least once per year or as often as every 4 to 6 months if you play long and hard every day. • If the locating notch on the base of a power tube breaks off, replace the tube. This significantly reduces the risk of damaging the amplifier by incorrectly inserting the tube. • Protect the amplifier from dust and moisture. If liquid gets into the amplifier proper, or if the amplifier is dropped or otherwise mechanically abused, have it checked out at an authorized service center before using it. • Proper maintenance and cleaning in combination with routine checkups by an authorized service center will ensure the best performance and longest life from the amplifier. CAUTION: Tube replacement should be performed only by qualified service personnel who are familiar with the dangers of hazardous voltages that are typically present in tube circuitry. ® GVT52-112 12 ™ Guitar Amplifier
- 13. Guitar Amplifier MIDRANGE REVERB B+ ™ 1/2 12AX7A POWER 6L6GC 6L6GC 4Ω B+ FULL / STANDBY / HALF SWITCH POWER TREBLE TONE CONTROL CIRCUITRY VOLUME VOLUME CH SELECT / BOOST FOOTSWITCH CH SELECT / BOOST FOOTSWITCH SPEAKER OUTPUTS MASTER FULL / STANDBY / HALF SWITCH 1/2 12AX7A BASS 6L6GC TREBLE REVERB SEND RETURN 1/2 12AX7A EFFECTS LOOP / REVERB FOOTSWITCH 1/2 12AX7A 6L6GC 1/2 12AX7A TONE CONTROL CIRCUITRY TREBLE BASS TRUE BYPASS GAIN 1/2 12AX7A TONE CONTROL CIRCUITRY BASS TONE CONTROL CIRCUITRY VOLUME SPEAKER OUTPUTS 4Ω 4Ω 8Ω 8Ω 16 Ω 1/2 12AX7A EFFECTS LOOP SEND RETURN BOOST CHANNEL 2 MASTER 1/2 12AX7A TONE CONTROL CIRCUITRY MIDRANGE 1/2 12AX7A 1 CE TREBLE TRUE BYPASS INPUT CHANNEL SELECT CHANNEL 1 GAIN BASS VOLUME Block Diagram TONE CONTROL CIRCUITRY CELESTION SPEAKER 12" 16 Ω 16 Ω 8Ω 8Ω 4Ω ® GVT52-112 13
- 14. TECHNICAL SPECIFICATIONS Preamp Tubes Power Amp Tubes Premium 3 x 12AX7 / ECC83 / 7025 Premium 2 x 6L6GC Output Power Rating 50 watts rms (“full” tetrode mode) / 25 watts rms (“half” triode mode) into 4, 8 or 16 Ω Maximum Gain - Channel 1 64 dB @ 1 kHz, volume max, tones centered, boost engaged, 16 Ω out Maximum Gain - Channel 2 100 dB @ 1 kHz, volume max, tones centered, boost engaged, 16 Ω out Tone Controls - Channel 1 Bass: +12 / –12 dB @ 80 Hz Middle: –6 dB @ 800 Hz / +10 dB @ 2 kHz Treble: +12 / –12 dB @ 5 kHz Tone Controls - Channel 2 Bass: Middle: Treble: Speaker Custom Designed 12" Celestion Speaker +12 / –12 dB @ 80 Hz –6 dB @ 800 Hz / +10 dB @ 1 kHz +12 / –12 dB @ 5 kHz Power Requirements 100–120 V~ : T 4A L 250V fuse, 50–60Hz, 200W 220–240 V~ : T 2A L 250V fuse, 50–60Hz, 200W Size (H x W x D) 19.5 in/496 mm (with feet) x 24.0 in/610 mm x 11.0 in/280 mm handle adds 0.75 in/19 mm to H Weight 52.2 lb / 23.7 kg (approximately) ® GVT52-112 14 ™ Guitar Amplifier
- 15. Service Information If there is a problem with the GVT52-112 amplifier, please visit our website (www.ampeg.com) and click on Support for service information, or call Technical Support at 1-800-898-3211 Monday – Friday during normal business hours, Pacific Time, to receive assistance. GVT52-112 owners outside of the U.S., contact the local distributor for technical support and service. The GVT52-112 is covered with a durable fabric-backed vinyl material. Clean with a dry lint-free cloth. Never spray cleaning agents on the GVT52-112. Avoid abrasive cleansers which would damage the finish. Ampeg continually develops new products and improves upon existing ones. For this reason, the specifications and information in this manual are subject to change without notice. “Ampeg” is a registered trademark of LOUD Technologies Inc. All other brand names mentioned are trademarks or registered trademarks of their respective holders and are hereby acknowledged. www.ampeg.com ©2011 LOUD Technologies Inc. 16220 Wood-Red Road NE • Woodinville, WA 98072 Part No. SW0909 Rev. B 07/11 ® Guitar Amplifier ™ GVT52-112 15