GFX-20
GUITAR AMPLIFIER WITH
DIGITAL SIGNAL PROCESSING
OWNER’S MANUAL
Congratulations!
You are now the proud owner of the Crate GFX-20 guitar amplifier. This small but
versatile amplifier features two separate channels – one crystal clear and the other with
our patented “Flex-Wave” distortion – combined with a three-band EQ and an easy to
operate DSP section which lets you dial in a variety of digital effects such as delay,
flange, chorus and reverb. A special damping circuit simulates the “current source” type
output of a tube amp, giving you solid state reliability combined with classic tube
sounds.
Your GFX-20 is Musician Made in the U.S.A., using only the best components.
Extensive testing at the hands (and ears) of skilled technicians and musicians insures
you that this amplifier is the absolute best it can be.
In order to get the most out of your new amplifier, we strongly urge you to go over
the information contained in this manual before you begin playing.
And thank you for choosing
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GFX-20 Amplifier
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9: DSP MODE: Select the type of digital
effect(s) desired with this control. Each cat-
egory and its central location is called out
(delay, flange, etc.) by the markings around
the control, with variations, as follows:
12: ON LED: The word “ON” will glow when
you turn on the GFX-20, showing you that
the amplifier is activated and ready to play.
13: POWER: This heavy-duty rocker-type
switch is used to turn the amplifier ON in the
left position, off in the right position. The ON
LED (#12) works with this switch as a visual
indicator.
• Bypass (DSP off)
• Slapback delay
• Long delay w/regeneration
• Flange
• Slow Chorus
• Fast Chorus
• Chorus w/small room reverb
• Small room reverb
• Large room reverb
14: POWER CORD: (Rear panel, not
shown: This heavy-duty, grounded, three-
wire power cord is to be plugged into ONLY
a safely-wired, grounded 120 volt, 60 cycle
AC power outlet. DO NOT attempt to defeat
the ground connection of this cable! If your
GFX-20 was purchased outside the United
States, see the unit’s rear panel for its power
rating and follow the above guidelines.
10: HEADPHONES: For private practice
sessions, plug a pair of stereo headphones
into this jack. The internal speaker is discon-
nected whenever headphones are being
used.
11: EXTERNAL SPEAKER*: You may con-
nect the GFX-20 to an external speaker with
a rated impedance of at least 4 ohms using
this jack. The internal speaker is disconnect-
ed whenever an external speaker is used.
*WARNING:
DO NOT attempt to
use headphones in
the Speaker jack!
Permanent hearing
damage could result!
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GFX-20 Amplifier
GFX-20 TECHNICAL SPECIFICATIONS
Output Power Rating
>20 watts RMS @ 5% THD 4 ohms, 120VAC
Gain, Overdrive Channel
Gain, Clean Channel
86dB +/-6dB @ 1kHz
46dB +/-6dB @ 1kHz
Tone Control Range, Low
Tone Control Range, Mid
Tone Control Range, High
25dB @ 80Hz
19dB @ 900Hz
23dB @ 5kHz
Signal To Noise, Overdrive Channel
Signal To Noise, Clean Channel
>50dB
>65dB
Maximum Signal Accepted
Internal Speaker
>1.2 volts RMS min. @ 400Hz
10” Crate Custom Design 4 ohm
Input Power Requirements
120 VAC, 60Hz, 20VA
100/115VAC, 50/60Hz, 20VA
230VAC, 50/60Hz, 20VA
Size and Weight:
15” H x 16.75” W x 9.5” D, 21 lbs.
The GFX-20 is covered with a durable black Tolex material: wipe it clean with a lint-free cloth. Never
spray cleaning agents onto the cabinet. Avoid abrasive cleansers which could damage the finish.
CAUTION
PRECAUCION
ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RIESGO DE CORRIENTAZO
NO ABRA
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOIS-
TURE. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT
REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS
O
DESCARGAS
LA
ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ
AFIN D'ÉVITER TOUT RISQUE D'INCENDIE OU D'ÉLECTROCUTION. POUR
REDUIRE D'ELECTROCUTION NE PAS ENLEVER LE COUVERCLE. AUCUNE
PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE
REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE.
ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO
A
LLUVIA
O
LA HUMEDAD. PARA DISMINUOIR EL RIESGO DE CORRIENTAZO.
NO ABRA LA CUBIERTA. NO HAY PIEZAS ADENTRO QUE EL USARIO PUEDO
REPARAR DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS.
IMPORTANT SAFETY INSTRUCTIONS
• READ, FOLLOW, HEED, AND KEEP ALL INSTRUCTIONS AND WARNINGS.
• DO NOT OPERATE NEAR ANY HEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR
PROPER OPERATION, THIS UNIT REQUIRES 3” (75mm) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR
FLOW PROVISIONS IN THE CABINET.
• DO NOT USE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.
• CLEAN ONLY WITH LINT-FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS.
• ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND
COMPATIBLE WITH VOLTAGE, POWER, AND FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.
• PROTECT THE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.
• UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.
• ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR SAFE OPERA-
TION AND TO AVOID INJURY.
• THIS APPARATUS DOES NOT OPERATE NORMALLY AND REQUIRES SERVICE WITH ANY PHYSICAL DAMAGE FROM IMPACT OR
ANY EXPOSURE TO MOISTURE.
• SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.
• OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND
PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PRO-
TECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
"REFERREZ-VOUS AU MANUAL D'UTILISATION"
"DANGEROUS VOLTAGE"
“VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION"
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Crate continually develops new products, as well as improves existing ones. For this reason, the
specifications and information in this Crate manual are subject to change without notice.
©1998 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
P/N 47-452-01 • 03/02
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