Three-Channel Guitar Amplifier
User’s Guide
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Three-Channel Guitar Amplifier
Congratulations!
You are now the proud owner of the Crate GT120HL three-channel
guitar amplifier. This rugged amplifier combines outstanding features
with serious clean and distorted sounds and boasts a uniquelly illumi-
nating front piece. Front panel RCA input jacks allow you to play along
with your favorite CD or tape. The rear panel Insert Jack allows you to
connect your effects for greater flexibility. Channel switching and reverb
may be controlled by means of a footswitch.
Like all Crate products, your GT120HL amplifier is designed by
musicians, and built using only the best components. Extensive testing
confirms 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 read the information contained in this manual before you begin
playing.
And thank you for choosing Crate.
Declaration of Conformity
Manufacturer’s Name: SLM Electronics
Corporate Headquarters: 1901 Congressional Drive, St. Louis, Missouri 63146
Primary Production Facility: 700 Hwy 202 W, Yellville, Arkansas, 72687
Product Type: Audio Amplifier
Products meet the regulations for compliance marking under:
ETL standards UL6500, UL60065, or UL813
CSA standards E60065 or C22.2 No.1-M90
CE safety standard EN60065
CE EMC standards EN55103 or EN55013 and EN61000
FCC standards 47CFR 15.107 and 15.109 Class A
C-tick designation Level 2, ABN #56748810738, ARBN# N222
KETI standard K60065 (limited model approval)
Compliance Support Contact: SLM Electronics, Attn: R&D Compliance Engineer
1901 Congressional Drive, St Louis, Missouri, 63146 • Tel.: 314-569-0141, Fax: 314-569-0175
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Three-Channel Guitar Amplifier
The Front Panel:
1
2
3
4
5
6
7
8 9
10
1: POWER: Use this switch to turn the amplifier on (top of the switch depressed) and off (bottom of
the switch depressed). The front of the amplifier illuminates when the power is on.
2: CD INPUT: Use these RCA jacks to connect the output from a CD player or tape deck to the ampli-
fier. The signal at these jacks is combined into a mono signal which is sent to the internal power amp
circuit. Use the CD or tape player’s output level control to adjust the signal for the proper mix with
your guitar.
3: REVERB: Use this control to adjust the amount of reverb effect: in its fully counterclockwise posi-
tion the signal will be “dry” (without any effect). As you rotate the control clockwise the amount of
reverb increases.
CLEAN CHANNEL: A normal gain channel designed to give you crystal clean sounds.
4: HIGH: Use this control to adjust the high frequency level of the Clean channel.
5: MID: Use this control to adjust the midrange frequency level of the Clean channel.
6: LOW: Use this control to adjust the low frequency level of the Clean channel.
7: VOL: Use this control to adjust the output level of the Clean channel.
8: CLEAN LED: This LED illuminates when the Clean channel is selected.
9: SOLO/RHYTHM/CLEAN SELECT: Use this switch to select the Clean channel or the Solo and
Rhythm channels. With the switch in the out position, the Clean channel is selected. When the switch
is depressed, either the Solo or Rhythm channel is selected, depending on the setting of the
Solo/Rhythm Select switch (#16).
SOLO/RHYTHM CHANNELS: High gain channels designed to give you sounds with serious overdrive.
10: LEVEL: Use this control to adjust the output level of the Rhythm channel.
11: HIGH: Use this control to adjust the high frequency level of the Solo/Rhythm channel.
12: MID: Use this control to adjust the midrange frequency level of the Solo/Rhythm channel.
13: LOW: Use this control to adjust the low frequency level of the Solo/Rhythm channel.
14: GAIN: Use this control to adjust the amount of distortion produced by the Rhythm channel.
15: RHYTHM LED: This LED illuminates when the Rhythm channel is selected.
16: SOLO/RHYTHM SELECT: Use this switch to select the Solo or Rhythm channel. When this
switch is depressed, the Solo channel is selected. With the switch in the out position, the Rhythm
channel is selected. This switch is active only when the Solo/Rhythm/Clean Select switch (#9) is
depressed.
17: LEVEL: Use this control to adjust the output level of the Solo channel.
18: SHAPE: Use this control to “dial in” the tone for the Solo channel. Rotating the control counter-
clockwise enhances the mid frequencies, while rotating the control clockwise enhances the low and
high frequencies.
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Three-Channel Guitar Amplifier
11
12
13
14 15 16 17
18
19 20 21
19: GAIN: Use this control to adjust the amount of distortion produced by the Solo channel.
20: SOLO LED: This LED illuminates when the Solo channel is selected.
21: INPUT: Use this jack to connect your guitar to the amplifier by means of a shielded instrument cable.
The Rear Panel:
22
23
24
25
26
22: INSERT: Use this jack to connect an external effects device to the amplifier. Use Crate’s STP201,
STP202, or STP203 stereo-to-mono Y-cord or an adapter such as Crate’s YPP117 and two 1/4”
mono signal cables to connect to the effect as shown below.
23: CLEAN/SOLO/RHYTHM FOOTSWITCH: Use this jack to connect the 1/4” stereo plug on the
footswitch cable to the three-button footswitch (supplied). This allows you to remotely switch between
the Clean and Distortion channels and between the Solo and Rhythm channels.
24: REVERB FOOTSWITCH: Use this jack to connect the 1/4” mono plug on the footswitch cable to
the three-button footswitch (supplied). This allows you to remotely turn the reverb on and off.
25: SPEAKER: Use this jack to connect the amplifier to your speaker cabinet(s). The minimum
impedance for the cabinet(s) is 4 ohms.
WARNING: The speaker output of this unit can exceed 10 Watts and could be a shock injury. Connection to
speakers should be performed by a skilled person in compliance with local building codes. Class 2 wiring
is required for speaker cables. Use of external speakers outside the ratings stated at the speaker jack may
result in a shock injury or damage to the unit.
26: FUSE: The fuse protects the amplifier from dam-
ages caused by a faulty AC power source and/or other
problems. If the fuse opens, replace it ONLY with the
same size and type. If fuses continue to fail, check the
AC source – if the source is okay, contact your Crate
dealer for service information.
Stereo-to-mono Y-cord:
Y-adapter and 2 cables:
TIP
RETURN
TIP
RING
SLEEVE
to Insert
to Insert
RING
SLEEVE
SEND
jack
jack
GROUND
(STP201, 3'
STP202, 6'
STP203, 9')
(YPP117)
27: AC LINE CORD (not shown): This grounded power
cord is to be plugged into a grounded power outlet, wired to
current electrical codes and compatible with the voltage,
power, and frequency requirements stated on the rear
panel. Do not attempt to defeat the safety ground con-
nection.
(1/4"-TO-1/4"
MONO CABLES)
to
to
effect
"IN"
to
to
effect
"IN"
effect
"OUT"
jack
effect
"OUT"
jack
jack
jack
External Effect
External Effect
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Three-Channel Guitar Amplifier
Suggested Settings:
Sweet ‘n Clean:
OUT
Just a ‘Lil Nasty:
Politely Gritty:
Down ‘n Dirty:
Mean & Obscene:
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Three-Channel Guitar Amplifier
System Block Diagram:
BUFFER
INPUT
CLEAN CHNL
VOL LOW MID HIGH
SOLO/
RHYTHM/
CLEAN
SOLO
SOLO
RTHM
RHYTHM
SOLO
SOLO
SWITCHING
CIRCUIT
LEVEL
RHYTHM
SOLO/
RHYTHM
RHYTHM
LEVEL
SOLO
GAIN
RHYTHM
GAIN
SHAPE
LOW MID HIGH
MIX
AMP
INSERT
REVERB
POWER
AMP
SPEAKER
CD
INPUT
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Three-Channel Guitar Amplifier
GT120HL TECHNICAL SPECIFICATIONS:
Output Power Rating
Input Impedance
120W RMS @5% THD, 4Ω, 120 VAC
470kΩ
Total System Gain
Solo Ch
Overdrive Ch
Clean Ch
110dB, all controls @10
88dB, all controls @10
58dB, all controls @10
CD Input
29dB
Maximum Input Signal Accepted
7 volts peak-to-peak
Proprietary Circuit
Solo Channel
O.D. Channel
Shape Control
Low Control
Mid Control
High Control
20dB range @ 80Hz
15dB range @ 1kHz
20dB range @ 10kHz
Clean Channel
Low Control
Mid Control
High Control
36dB range @ 80Hz
15dB range @ 800Hz
40dB range @ 10kHz
Power Requirements
Size and Weight
120 VAC, 60Hz, 95VA
100/115VAC, 50/60Hz, 95VA;
230VAC, 50/60Hz, 95VA
9.5” H x 26” W x 10” D, 25 lbs.
The GT120HL is covered with a durable Tolex material: wipe it clean with a lint-free cloth.
Never spray cleaning agents onto the cabinet. Avoid abrasive cleansers which would damage the finish.
Crate continually develops new products, as well as improves existing ones. For this reason, the specifications
and information in this manual are subject to change without notice.
@2004 SLM Electronics, a division of St. Louis Music, Inc • 1400 Ferguson Avenue • St. Louis, MO 63133
47-368-01 • 111604
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