Crate Amplifiers Musical Instrument Amplifier GX 1200H User Manual

GX-1200H  
GUITAR AMPLIFIER  
OWNER’S MANUAL  
Congratulations!  
You are now the proud owner of the Crate GX-1200H guitar amplifier. This rugged  
amp head combines outstanding features with serious clean and distorted sounds.  
Channel selection, Crate’s exclusive Shape circuit, and reverb on/off are controllable by  
the supplied three-button footswitch. An insert jack allows virtually noise-free connection  
of your favorite effects.  
Like all Crate products, your GX-1200H 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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GX-120OH Amplifier  
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1: INPUT: Connect your guitar here using a  
shielded instrument cable.  
8: LEVEL: Sets the output volume level from the  
Overdrive Channel: in the far-left position there  
is no output; turning the control to the right  
increases the output. Use this control along with  
the Gain and Shape controls (#2, 3 & 4) to cre-  
ate a wide variety of sounds.  
OVERDRIVE CHANNEL: A high gain channel  
giving you sounds from a slight edge to serious  
overdrive.  
2: GAIN 1: When active, sets the amount of  
compression and distortion from the amplifier. At  
far left, the sound will have a thick compressed  
quality. As you turn the control to the right the  
amount of distortion increases. Gain 1 produces  
less intense distortion than Gain 2 and is active  
only when the Gain Select switch (#5) is out.  
9: CHANNEL SELECT: When this switch is  
pressed in the Overdrive Channel is engaged.  
The Clean Channel is selected when this switch  
is out. A footswitch (#21) overrides this switch.  
The adjacent LEDs indicate which channel is  
selected.  
CLEAN CHANNEL: A normal gain channel  
designed to give you crystal clear sounds.  
3: GAIN 2: When active, sets the amount of  
compression and distortion from the amplifier. At  
far left, the sound will have a thick compressed  
quality. As you turn the control to the right the  
amount of distortion increases. Gain 2 produces  
more intense distortion than Gain 1 and is active  
only when the Gain Select switch (#5) is in.  
10: LEVEL: Sets the output volume level from  
the Clean Channel: in the far-left position there  
is no output; turning the control to the right  
increases the output level.  
11: LOW: Adjusts the low frequency output  
level: to the left reduces the low frequency out-  
put; to the right increases it. This control allows  
a range of 22dB at 80Hz.  
4: SHAPE: Working in conjunction with the Gain  
2 control, rotate the Shape control until you find  
the sound you’re looking for. Turning the control  
towards the left enhances the mid frequencies;  
turning it to the right enhances the low and high  
frequencies. (Only affects Gain 2 when active.)  
12: MID: Adjusts the mid frequency output level:  
to the left reduces the midrange output; turning  
it to the right increases it. This control allows a  
range of 14dB at 600Hz.  
5: GAIN SELECT: Switches between Gain 1  
(out) and Gain 2 (in). A footswitch (#21) over-  
rides this switch.  
13: HIGH: Adjusts the high frequency output  
level: to the left reduces the high frequency out-  
put; to the right increases it. This control allows  
a range of 28dB at 10kHz.  
6: LOW: Adjusts the low frequency output level:  
to the left reduces the low frequency output; to  
the right increases it. This control allows a range  
of 11dB at 80Hz.  
14: REVERB LEVEL: Adjust the amount of  
reverberation with this control: in the full-left  
position the output signal is “dry” (no reverb);  
rotating the control to the right increases the  
amount of reverb. Reverb can be turned on and  
off with a footswitch (#22).  
7: HIGH: Adjusts the high frequency output  
level: to the left reduces the high frequency out-  
put, to the right increases it. This control allows  
a range of 10dB at 10kHz.  
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GX-120OH Amplifier  
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15: INSERT: Connect an external effects device  
via this jack. Use a stereo 1/4” male Y-cord: ring  
= send, tip = return, sleeve = ground. See the  
illustration on the panel to the right for more  
information  
22: REVERB FOOTSWITCH JACK (rear panel,  
not shown): Connect the mono 1/4” plug of the sup-  
plied three-button footswitch here for remote control  
of the reverb on and off.  
Connecting to the Insert jack:  
16: POWER ON LED: Lights when the amplifier  
is turned on.  
The Insert jack (#15) lets you patch external  
effects into the amplifier just prior to its power  
amp stage. Use Crate’s STP201, STP202 or  
STP203 stereo-to-mono Y-cord or an adapter  
such as Crate’s YPP117 and 2 1/4” mono signal  
cables to connect to the effect as shown below.  
17: POWER SWITCH: Turns the amplifier ON in  
the up position, off in the down position.  
18. POWER CORD (rear panel, not shown):  
Your GX-1200H is equipped with a heavy-duty  
grounded three-wire power cord. Be sure this  
cord is properly plugged into a safely wired  
grounded 120 volt, 60Hz AC power outlet before  
use. (If your GX-1200H was purchased outside  
the United States, refer to the rear panel for  
power ratings.) For your safety, never attempt to  
defeat the ground connection on this cord.  
Stereo-to-mono Y-cord:  
Y-adapter and 2 cables:  
TIP  
RETURN  
TIP  
to Insert  
to Insert  
jack  
RING  
SEND  
RING  
jack  
SLEEVE  
GROUND  
SLEEVE  
(STP201, 3'  
STP202, 6'  
STP203, 9')  
19: SPEAKER JACKS (rear panel, not  
shown): Use these 1/4” output jacks to connect  
the amplifier to your speaker cabinet(s). Use  
heavy gauge speaker cables. The GX-1200H  
can operate into speaker loads as low as 4  
ohms.  
(YPP117)  
20: FUSE (rear panel, not shown): Protects  
the amplifier against damages caused from a  
faulty AC power source or other problems. If the  
fuse blows, replace it ONLY with the same size  
and type fuse. If the fuse blows repeatedly  
check the AC source; if it’s okay, contact your  
Crate dealer for service information.  
(1/4"-TO-1/4"  
MONO SHIELDED  
CABLES)  
to  
to  
to  
effect  
"IN"  
to  
effect  
"IN"  
effect  
"OUT"  
jack  
effect  
"OUT"  
jack  
jack  
jack  
21: CHANNEL SELECT / GAIN FOOTSWITCH  
JACK (rear panel, not shown): Connect the stereo  
1/4” plug of the supplied three-button footswitch here  
for remote control of the Channel Select and Gain  
Select settings.  
External Effect  
External Effect  
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GX-1200H Amplifier  
GX-1200H TECHNICAL SPECIFICATIONS  
Output Power Rating  
70 watts RMS @ 5% THD 8 ohms load 120VAC  
100 watts RMS @ 5% THD 4 ohms load 120VAC  
Maximum Input Signal Level Accepted  
Total System Gain  
8 volts, peak-to-peak  
Overdrive Channel: 110dB all controls @10, Gain 2; 88dB Gain 1  
Clean Channel: 58dB all controls @10  
Input Impedance  
470k ohms  
Overdrive Channel:  
Low Control:  
Shape Control:  
High Control:  
11dB Range @ 80Hz  
Proprietary Circuit  
10dB Range @ 10kHz  
Clean Channel:  
Low Control:  
Mid Control:  
High Control:  
22dB Range @ 80Hz  
14dB Range @ 600Hz  
28dB Range @ 10kHz  
Input Power Requirements  
120 VAC, 60Hz, 230VA  
100/115VAC, 50/60Hz, 230VA  
230VAC, 50/60Hz, 230VA  
Cabinet Size and Weight:  
9-3/8” H x 19-3/4” W x 9-1/2” D, 25 lbs.  
The GX-1200H 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  
ATTENTION  
VORSICHT  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
RISQUE D'ELECTROCUTION  
NE PAS OUVRIR  
ELEKTRISCHE SCHLAGGEFAHR  
NICHT OFFENEN  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,  
DO NOT REMOVE COVER.  
ATTENTION: 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.  
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT  
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM  
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM  
WARTUNGSPERSONAL ZU UBERLASSEN.  
NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE  
UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER  
CORD; CONNECT ONLY TO A PROPERLY GROUNDED AC POWER OUTLET.  
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.  
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
CAUTION: 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 PROTECTION 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"  
"GEFAHLICHE SPANNUNG"  
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"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"  
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.  
©2001 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133  
P/N 47-477-04 • 05/01  
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