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IMPORTANT SAFETY INSTRUCTIONS

1.  Read all safety and operating instructions before using this product.
2.  All safety and operating instructions should be kept for future reference.
3.  Read and understand all warnings listed on the operating instructions.
4.  Follow all operating instructions to operate this product.
5.  This product should not be used near water, i.e., bathtub, sink, swimming pool, wet basement, etc.
6.  Only use dry cloth to clean this product.
7.   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.

8.   Do not install this product 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.

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. Do not break the ground pin of the power supply cord.

11.   Only use attachments specified by the manufacturer.
12.   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.

13.   Unplug this apparatus during lightning storms or when unused for a long period of time.
14.    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.

15.   Refer all servicing to qualified service personnel. Servicing is required when the apparatus 

has been damaged in any way. 

16.   When a mains plug is used as the disconnect device, the disconnect device shall remain 

readily operable.

Exposure to high noise levels may cause permanent hearing loss. 

Individuals vary considerably to noise-induced hearing loss but nearly 

everyone will lose some hearing if exposed to sufficiently intense noise 

over time.

According to OSHA, any exposure in the above permissible 

limits could result in some hearing loss. Hearing protection 

must be worn when operating this amplification system in 

order to prevent permanent hearing loss.

DURATION PER DAY (HOURS) 

1  

 

SOUND LEVEL (dB) 

90  93  95  97  100  103

The U.S. Government’s Occupational Safety and Health Administration 

(OSHA) has specified the following permissible noise level exposures:

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.

1

Apparatus shall not be exposed to dripping or splashing. Objects filled with liquids, such as vases, shall not be placed on  

the apparatus.

• 

The 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 etre exposé aux écoulements ou aux éclaboussures et aucun objet ne contenant de liquide, tel qu’un vase, ne 
doit etre placé 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 utilisé pour déconnecter le systeme. La prise du secteur ne doit pas etre obstruée ou doit etre facilement acces-
sible pendant son utilisation. Pour etre completement déconnecté de l’alimentation d’entrée, la prise doit etre débranchée 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 connecté 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 réduire le risque d’incendie ou de choc électrique, ne pas exposer cet appareil sous la pluie et l’humidité.

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Summary of Contents for GT50H

Page 1: ...GT50H OWNER S MANUAL w w w a c o u s t i c a m p l i f i c a t i o n c o m 50 WATT TUBE GUITAR AMPLIFIER...

Page 2: ...ay cause permanent hearing loss Individuals vary considerably to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise over time According to O...

Page 3: ...reby 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 particula...

Page 4: ...ls 8 TREBLE This control increases or decreases treble frequencies for both channels 9 LEAD VOLUME This control adjusts the relative volume of the Lead channel 10 PRESENCE This control adjusts the upp...

Page 5: ...e this switch to select Triode or Pentode mode for the tubes CAUTION The amplifier should be switched to STANDBY before changing the Triode Pentode setting 6 BOOST LEVEL This adjust the level of the B...

Page 6: ...ification P O Box 5111 Thousand Oaks CA 91359 5111 www acousticamplification com BOOST LEVEL DRY WET MODE TRIODE PENTODE TRIODE 25W 12W PENTODE 50W 25W 4 0HM OR 8 0HM 8 0HM 8 0HM OR 16 0HM 16 0HM GT50...

Page 7: ...ower 25 watts This feature is useful in rehearsal 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 sat...

Page 8: ...ement 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 t...

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