Crate Amplifiers Musical Instrument Amplifier GT 500H User Manual

GT-500H  
GUITAR AMPLIFIER  
OWNER’S MANUAL  
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GT-500H Amplifier  
Congratulations!  
You are now the proud owner of one of the newest and most versatile tube amplifiers  
available for the guitar, the GT-500H. This remarkable amplifier offers tremendous flexibil-  
ity and power with two separate channels and silent switching for a uniquely rich palette of  
tonal variety and simplicity of control over your sound.  
Your GT-500H amplifier is musician-made in the U.S.A. using the finest components  
available. Each unit is rigorously tested by skilled technicians and musicians to ensure that  
your amplifier is the 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  
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.  
NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
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.  
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: THIS UNIT IS 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 RECOMMENDED IF  
UNIT IS OPERATED AT HIGH VOLUME. THE CHART BELOW SHOWS THE U.S. GOVERNMENT’S OCCUPATIONAL SAFETY AND HEALTH ADMINIS-  
TRATION (OSHA) REGULATIONS WHICH WERE IN EFFECT AT THE TIME OF THIS PUBLICATION FOR PERMISSIBLE NOISE EXPOSURE, PER  
29CFR1910.95, TABLE G-16:  
SOUND LEVEL DBA, DURATION PER DAY  
SOUND LEVEL DBA, DURATION PER DAY  
SLOW RESPONSE  
IN HOURS  
SLOW RESPONSE  
IN HOURS  
90  
92  
8
6
4
3
2
102  
105  
110  
115  
1 - 1 1/2  
1
95  
1/2  
1/4 or less  
97  
100  
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS TO THESE AMOUNTS LISTED ABOVE COULD RESULT IN SOME HEARING LOSS.  
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"  
"REFERREZ-VOUS AU MANUAL D'UTILISATION"  
"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"  
"DANGEROUS VOLTAGE"  
"DANGER HAUTE TENSION"  
"GEFAHLICHE SPANNUNG"  
EXPLANATION OF  
GRAPHICAL SYMBOLS:  
=
=
2
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GT-500H Amplifier  
TABLE OF CONTENTS:  
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
The Front Panel Controls and Their Use . . . . . . . . . . .4  
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Connecting to the Insert Jack . . . . . . . . . . . . . . . . . . .5  
Some Suggested Settings . . . . . . . . . . . . . . . . . . . . .6  
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . .7  
Technical Specifications . . . . . . . . . . . . . . . .back cover  
Features:  
• All tube operation for classic vintage growl and howl, as you want it, when you want it  
• Two completely independent channels with individual gain and tone controls  
• Quick, silent channel switching from the front panel or with footswitch (provided)  
• Individual reverb return controls for each channel  
• Buffered insert jack – use a stereo-to-mono “Y” cord to patch in your favorite effect(s)  
• Specially designed paper bobbin output transformer for a true “vintage” sound  
• Drives 8 and 16 ohm speaker cabinets with no problem and delivers lots of true vintage  
tone, tone, tone  
• Durable tolex® covering and special cosmetic treatments for a unique stage appearance  
3
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GT-500H Amplifier  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
The Front Panel Controls and Their Use:  
1. INPUT: This jack accepts a high impedance signal from a  
9. CHANNEL B MID: This control adjusts the amount of  
guitar, bass, keyboard, etc.  
midrange frequency response on Channel B.  
2. CHANNEL A VOLUME: This control sets the level of  
Channel A. The sound is brighter at lower settings, and can  
be cranked up for a crunchy rhythm sound.  
10. CHANNEL B BASS: This control adjusts the level of low  
frequency response on Channel B.  
11. CHANNEL B LEVEL: The overall volume level of  
Channel B is controlled with this knob. When set at 2  
o’clock, the power amp begins to be overdriven for true  
power amp distortion.  
3. CHANNEL A TREBLE: This control adjusts the level of  
high frequency response on Channel A.  
4. CHANNEL A BASS: This control adjusts the level of low  
frequency response on Channel A. (When playing at  
extreme volume levels, you might want to back this control  
down just a bit.)  
12. CHANNEL A REVERB LEVEL: This control adjusts the  
amount of reverb on Channel A.  
13. CHANNEL B REVERB LEVEL: This control adjusts the  
5. CHANNEL SELECT: Silent channel switching is achieved  
with this button. When the footswitch is plugged in, this but-  
ton is deactivated.  
amount of reverb on Channel B.  
14. FOOTSWITCH JACK: Use the supplied single-button  
footswitch (Crate model #CFP-1) or an equivalent to  
achieve silent remote channel switching. Plugging in the  
footswitch deactivates the front panel channel switch (#5).  
6. INSERT JACK: This jack provides a line level access point  
between the preamp and the power amp. The output is  
buffered by a single transistor. It is out of the circuit com-  
pletely when nothing is plugged into it. Use a Crate Model  
#CYC6MS mono-to-stereo Y-cord, or a Y-adapter with  
extenders. For more details refer to the section  
“Connecting to the Insert Jack” on the following page.  
15. STANDBY SWITCH: This switch should remain turned off  
when the unit is first turned on in order to allow the tubes  
to warm up properly before high voltage is applied to  
them. The Standby switch should also be turned off dur-  
ing extended breaks in playing when the amp is left on.  
This will help ensure longer tube life.  
7. CHANNEL B GAIN: Use this control to achieve sounds  
ranging from bluesy crunch to full tilt-hard rock rhythm.  
Experimenting with a combination of the gain and volume  
controls on the amp along with your guitar’s volume con-  
trols can produce a wide variety of useable sounds.  
16. POWER SWITCH: This switch applies power to the unit  
when switched to the on (up) position.  
The Standby and Power switches light up when on.  
8. CHANNEL B TREBLE: This control adjusts the level of the  
high frequency response on Channel B.  
4
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GT-500H Amplifier  
Connecting to the Insert Jack:  
The front panel Insert jack (#6) lets you patch external  
effects into the GT-500H just prior to its power amp stage.  
When using Crate’s CYC6MS stereo-to-mono Y-cord, connect  
its 1/4” stereo plug into the amp’s Insert jack, its “send” plug  
into the IN jack of the effect and its “return” plug into the OUT  
jack of the effect.  
SPEAKER  
IMPEDANCE  
SPEAKERS  
50 WATTS RMS  
Made in the  
U.S.A. by  
SLM ELECTRONICS  
1400 Ferguson Ave.  
St. Louis, MO 63133  
8
16  
MODEL: GT-500H  
EXT.  
MAIN  
(USE FIRST)  
Another method is to buy or make a stereo-to-mono Y-  
adapter (such as Crate’s CA11Y) and use two 1/4” signal  
cables to patch into the effect as shown below.  
18  
19  
To Insert Jack  
The Rear Panel:  
17. AC LINE CORD (not shown): Connect the male end of this  
heavy duty power cord to a properly grounded AC power  
outlet of the correct voltage. DO NOT attempt to defeat the  
ground pin of the power cord! (If your amplifier was pur-  
chased outside the United States, see the rear panel serial  
number label for voltage and current information.)  
TIP = RETURN  
RING = SEND  
SLEEVE = GROUND  
18. IMPEDANCE SWITCH: For the best performance and  
least strain on the amp, you MUST match the amp’s  
impedance to that of your speaker cabinet(s). Set the  
selector switch to the 8 or 16 ohm position, depending on  
the total impedance of your cabinets. The chart below can  
help you determine that impedance based on the follow-  
ing combinations of speakers connected in parallel.  
TIP  
RING  
SLEEVE  
CAB IMP.  
16 ohms  
32 ohms  
32 ohms  
# OF CABS  
TOTAL IMP.  
8 ohms  
16 ohms  
8 ohms  
2
2
4
TIP (return):  
Connect to OUT  
jack of effect  
RING (send):  
Connect to IN  
jack of effect  
19. SPEAKER JACKS: Connect the amplifier to your speak-  
er cabinet(s) via these jacks, using heavy-duty speaker  
cables (not instrument patch cords). Use cabinets rated at  
8 ohms or higher, in combinations which never create a  
load lower than 8 ohms. Make sure the Impedance switch  
(#18) is properly set. Always use the MAIN speaker jack  
first, then connect to the EXTENSION jack if using more  
than one cabinet.  
OUT  
IN  
5
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GT-500H Amplifier  
Some Suggested Settings:  
SPARKLING CLEAN  
WARM & CLEAN  
BLUESY DIRT  
CRUNCH RHYTHM  
BLUESY GRIND  
"DRIVE 'EM MAD" SHRED  
TRY THESE AT MIDNIGHT!  
6
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GT-500H Amplifier  
System Block Diagram:  
SECOND  
GAIN  
CHANNEL A:  
CHANNEL A  
TONES & VOLUME  
FIRST  
GAIN  
VOL. TREB. BASS  
INPUT  
CHANNEL B:  
TONE PRE-  
EMPHASIS  
CHANNEL B  
TONES & LEVEL  
GAIN  
SECOND  
GAIN  
THIRD  
GAIN  
FOURTH  
& FIFTH  
GAIN STAGE  
TREB. MID BASS LEVEL  
FOOTSWITCH  
REVERB  
REVERB  
LEVELS  
INSERT  
MAIN  
SPEAKER  
PHASE  
SPLITTER  
POWER  
AMP  
EXTENSION  
SPEAKER  
7
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GT-500H Amplifier  
TECHNICAL SPECIFICATIONS:  
Output Power Rating  
50W RMS @ 10% THD, 8 ohm load, 120 VAC  
Input Impedance  
1M ohm  
Maximum Signal Accepted  
Signal To Noise Ratio  
2.8V peak to peak  
Channel B:  
Channel A:  
52dB  
58dB  
Gain  
Channel B:  
Channel A:  
75dB  
68dB  
Tone Control Range  
Channel B:  
Bass:  
Mid:  
12dB, 60Hz  
10dB, 600Hz  
Treble: 7dB, 4kHz  
Bass: 20dB, 70Hz  
Treble: 16dB, 2kHz  
Channel A:  
Line Out Level  
Tube Type  
375mV RMS @ full power output  
Preamp: (4) 12AX7 Power Amp: (4) EL84/6BQ5  
Power Requirements  
120VAC, 60Hz, 110VA  
100/115VAC, 50/60Hz, 110VA  
230VAC, 50/60Hz, 110VA  
Size and Weight  
11”H x 21.25”W x 11.25”D, 35 lbs.  
The GT-500H is covered with a durable black Tolex® material. To keep the cabinet in top condition,  
wipe it clean with a damp lint-free cloth to remove dirt and road film. Never spray cleaning agents  
directly onto the cabinet, and stay away from abrasive cleansers which could damage the finish.  
Crate continually develops new products, as well as improves existing ones.  
For this reason, the specifications and information in this publication  
are subject to change without notice.  
©1998 SLM ELECTRONICS • A division of St. Louis Music • 1400 Ferguson Avenue • St. Louis, Mo 63133  
P/N 47-547-12 • 02/98  
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