Gibson GA-20 Owner's Manual
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Gibson GA-20 Owner's Manual

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GA-20, GA-40 &
GA-42 A
MPLIFIERS
O
'
M
WNER
S
ANUAL

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Summary of Contents for Gibson GA-20

  • Page 1 GA-20, GA-40 & GA-42 A MPLIFIERS ’ WNER ANUAL...

  • Page 2: Important Safety Instructions

    MPORTANT AFETY NSTRUCTIONS WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE AND OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHOULD NOT BE PLACED ON THIS APPARATUS. The lightning bolt warns of the risk of shock from high voltage. Do not tamper with or attempt to open any areas where this warning is present.
  • Page 3 Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produces heat.
  • Page 4 12. 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.
  • Page 5 L’interruttore attiva e disattiva (ON e OFF) l'amplificatore. Quando l’amplificatore viene acceso, la spia si illumina. Con l’interruttore in posizione OFF, l’amplificatore è ancora collegato alla rete. Wichtige Sicherheitsinformationen Setzen Sie dieses Gerät nicht in einer Umgebung ein, in der tropfende oder spritzende Flüssigkeiten auftreten könnten.
  • Page 6 AUS-Position befindet, ist der Verstärker nicht vom Stromnetz getrennt. Importantes instrucciones de seguridad No exponga este producto a goteos ni salpicaduras. No coloque objetos llenos de líquido sobre este producto, como por ejemplo un jarrón. Conecte siempre el producto a una toma de corriente que tenga una conexión a tierra de protección.
  • Page 7 Consignes importantes de sécurité Ne pas exposer ce produit à des suintements ou des éclaboussures. Ne pas poser des objets remplis de liquides, tels des vases, sur le produit. Brancher toujours le produit à une prise électrique qui possède une prise de protection à la terre.
  • Page 9 ERIES MPLIFIER As the new owner of a Gibson amplifier, you have joined a great Gibson legacy. When the electric guitar emerged in the 1930s as an instrument with its own voice, Gibson amplifiers powered that voice. In the 1940s and 1950s, Gibson’s continuing advances in amplifier design matched the company’s celebrated guitar innovations.
  • Page 10 We invite you to plug in, turn up, express yourself and become a part of a great Gibson tradition. If you ever have a question or concern about anything, any day, any time, please call Gibson Customer Service at 1-800-4GIBSON (444-2766) or email service@gibson.com.
  • Page 11 CHANNEL 1 CHANNEL 2 TREMELO Volume Treble Bass Volume Treble Middle Bass Reverb Speed Depth Input Jack 1 On/Off Input Jack 2 Mix Input Play/Standby The GA-20RVT...

  • Page 12: Front Panel

    FRONT PANEL Input 1: Accesses the first channel of your amplifier. This is the more aggressive channel that provides less headroom before overdrive. This channel offers Treble and Bass Controls. Input 2: Accesses the second channel of your amplifier. This is the cleaner channel that provides a rich clean tone, breaking into subtle overdrive later, as you increase the channels volume.
  • Page 13 smoother reverb effect. A clockwise turn increases the reverb “tail;” a counter clockwise turn decreases the reverb tail. At 7 o’clock, the Reverb effect is off. Tremolo: Creates an intermittent signal effect (think surf music) with variable Speed and Depth Controls. Speed: Determines the rate at which the signal fluctuates in volume.

  • Page 14: Rear Panel

    REAR PANEL Footswitch: Accepts the 2 button footswitch that shipped with your amplifier. Reverb and Tremolo are turned on or off with these buttons. Pentode/Triode Switch: In Pentode Mode, your amplifier will run in full power, providing higher output. In Triode Mode, your amplifier will run at about 1/2 power. This feature further enhances the flexibility of the Handbuilt Series.
  • Page 15 be sure to use a quality, unshielded speaker cable and only connect to speaker cabinets which are rated equal to the output jack you are using. For example: a 4X12 speaker cabinet, rated at 16 ohms, should ONLY be connected via the “16 ohm” output jack on the rear of your amplifier.

  • Page 16: Operating Instructions

    NOTE: Your Gibson amp is configured for the line voltage normally appropriate for the country in which you purchased it. 115V for U.S., 100VAC for Japan, and 230V for all other countries.
  • Page 17 To change the line voltage setting: Disconnect the power by removing the power cord from both the power outlet and the amplifier. Open the fuse compartment by inserting a screwdriver blade gently into the tab at the bottom of the compartment and prying until the tab can be removed with the fingers. Remove the line voltage selector assembly by gripping the line voltage indicator tab with pliers and pulling it straight out of its connector.
  • Page 18 TURN IT ON The Power Switch turns your amplifier ON and OFF.The “On/Off ” switch glows when the amplifier is turned on. CAUTION: Your amplifier is not disconnected from the mains when the Power Switch is in the OFF position. PLUG YOUR GUITAR IN First, turn the Volume knobs down –...
  • Page 19 TURN IT UP Gradually turn your volume up to a desirable level. MORE TECHNICAL INFORMATION CIRCUIT TOPOLOGY GA20RVT: Class A 15W GA40RVT & GA42RVT: Class A 30W INPUTS Channel1, Channel 2 & Mix TUBES/VALVES GA20RVT: 5X12AX7 (Preamp), 2X6L6 (Power) GA40RVT & GA42RVT: 5X12AX7 (Preamp), 2X6V6 (Power) FUSE The line fuse, located in the line voltage module on the back of the amp, protects your amplifier against irregularities in the A.C.
  • Page 20 If your amplifier continually blows the line fuse, there is a problem that must be corrected before the amplifier is put back into service. Contact an authorized Gibson Amplifier Service Center. See above for replacement fuse specification.

  • Page 21: Iec Socket

    Gibson Amplifier Service Center. From everyone here at Gibson, we thank you for trusting your tone to our amplifiers and hope you take as much pride in playing them as we have in designing and building them.
  • Page 22 Suite 330 159 South Jackson Street Seattle, Washington USA 98104 1.800.4.GIBSON service@gibson.com http://www.gibsonamps.com Gibson Labs is a Division of the Gibson Guitar Corporation...

This manual is also suitable for:

Ga-40Ga-42

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