GTX65
Three-Channel Guitar Amplifier
with Advanced Digital Signal
Processing
User’s Guide
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
Congratulations!
You are now the proud owner of the Crate GTX65
three-channel guitar amplifier with Advanced Digital Signal
Processing. This rugged amplifier combines outstanding
features with serious clean and distorted sounds. Dual
DSP controls provide 15 “Multi” effects and 15 Delay
effects which can be combined for a wide variety of
sounds. The Save/Tap button allows you to manually set
the tempo of many of the effects and to save new DSP
presets in the amplifier’s non-volatile memory. A separate
Reverb control adds even more to the array of effects.
Front panel RCA CD 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 DSP may be controlled by means
of a footswitch, which also allows access to two DSP pre-
sets on each of the three channels.
Like all Crate products, your GTX65 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
suggest that you read the information contained in this guide
before you begin playing.
CRATE
And thank you for choosing
.
3
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
The Front Panel:
20
1: INPUT: Use this jack to connect your guitar to the amplifier by means of a shielded
instrument cable.
SOLO/RHYTHM CHANNELS: High gain channels giving you sounds with serious over-
drive.
2: SOLO LED: This LED illuminates when the Solo channel is selected.
3: GAIN: Use this control to adjust the amount of distortion produced by the Solo channel.
4: SHAPE: Use this control to “dial in” the tone for the Solo channel. Rotating the control
counterclockwise enhances the mid frequencies, while rotating the control clockwise
enhances the low and high frequencies.
5: LEVEL: Use this control to adjust the output level of the Solo channel.
6: 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 (#13) is depressed.
7: RHYTHM LED: This LED illuminates when the Rhythm channel is selected.
8: GAIN: Use this control to adjust the amount of distortion produced by the Rhythm channel.
9: LOW: Use this control to adjust the low frequency level of the Solo/Rhythm channel.
10: MID: Use this control to adjust the midrange frequency level of the Solo/Rhythm channel.
11: HIGH: Use this control to adjust the high frequency level of the Solo/Rhythm channel.
12: LEVEL: Use this control to adjust the output level of the Rhythm channel.
13: 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 select-
ed. When the switch is depressed, either the Solo or Rhythm channel is selected, depend-
ing on the setting of the Solo/Rhythm Select switch (#6).
CLEAN CHANNEL: A normal gain channel designed to give you crystal clean sounds.
14: CLEAN LED: This LED illuminates when the Clean channel is selected.
15: VOL: Use this control to adjust the output level of the Clean channel.
4
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
21
22 23
24
16: LOW: Use this control to adjust the low frequency level of the Clean channel.
17: MID: Use this control to adjust the midrange frequency level of the Clean channel.
18: HIGH: Use this control to adjust the high frequency level of the Clean channel.
19: CD INPUT: Use these RCA jacks to connect the output from a CD player or tape deck
to the amplifier. 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.
20: DSP MULTI: Use this control to select one of the fifteen “Multi” digital effects. Complete
information about the DSP effects is on page 7.
21: DSP DELAY: Use this control to select one of the fifteen Delay digital effects.
Complete information about the DSP effects is on page 7.
22: SAVE/TAP: Use this pushbutton to set the tempo of many of the effects by tapping the
button repeatedly in time with the desired tempo. The Save/Tap button is also used to save
DSP presets and to restore the factory default DSP settings. Additional information about
the Save/Tap button is on pages 7 and 8.
23: SAVE/TAP LED: This LED flashes in time with the tempo set by the Save/Tap button
(#22), and serves as a status indicator for certain DSP activities (see page 8).
NOTE: For some of the DSP effects, the Save/Tap LED remains illuminated. The Save/Tap LED
does not illuminate when the DSP knobs are set to the Bypass position.
24. REVERB: Use this control to adjust the amount of digital reverb effect. In its fully coun-
terclockwise position the signal will be “dry” (without any reverb). As you rotate the control
clockwise the amount of reverb increases.
25: POWER: Use this switch to turn the amplifier on (top of the switch depressed) and off
(bottom of the switch depressed). The switch illuminates when the power is on.
NOTE: When the amplifier is turned on, the Save/Tap LED flashes for one second before the
amplifier is operational.
5
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
The Rear Panel:
100VAC:T2.5A
120VAC:T2A
230/240VAC:T1.25A
250V
250V
EXTENSION
SPEAKER
DSP
CHANNEL
INSERT
250V
BANK A
BANK B
CLEAN
SOLO/RTHM
CAUTION: TO REDUCETHE RISK OF FIRE,
REPLACE FUSE WITH SAME TYPE AND RATING.
ATTENTION: UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE.
FOOTSWITCH
26
27
28
29
30
26: FUSE: The fuse protects the amplifier from damages 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.
27: EXTENSION SPEAKER: Use this jack to connect the amplifier to an external speaker cabinet.
This jack is wired in series with the internal speaker(s) which remain active when an extension speak-
er is connected.
28: DSP A/B FOOTSWITCH: Use this jack to connect one of the footswitch cables to the three-but-
ton footswitch (supplied). This allows you to select between two presets for each of the three chan-
nels. Additional information about the operation of the footswitch is on page 9.
29: CLEAN/SOLO/RHYTHM FOOTSWITCH: Use this jack to connect one of the footswitch cables 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. (See page 9.)
30: INSERT: Use this jack to connect an external signal processor 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.
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 require-
ments stated on the rear panel. Do not attempt to defeat the safety ground connection.
Stereo-to-mono Y-cord:
Y-adapter and 2 cables:
TIP
RING
SLEEVE
RETURN
TIP
to Insert
jack
to Insert
jack
SEND
RING
GROUND
SLEEVE
(STP201, 3'
STP202, 6'
STP203, 9')
(YPP117)
(1/4"-TO-1/4"
MONO SHIELDED
CABLES)
to
to
effect
"IN"
to
to
effect
"IN"
effect
"OUT"
jack
effect
"OUT"
jack
jack
jack
External Effect
External Effect
6
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
The DSP Section:
The GTX65 features DSP
controls for Multi, Delay and
Reverb. Complete information
about the Multi and Delay
effects is given below. The Multi control selects the “pitch modified” and wah effects.
Many of these effects have their speed controlled by the Save/Tap button. The Delay
control selects the delay or echo effects. All of these effects have their speed controlled
by the Save/Tap button. Additional information is provided on pages 5 and 10.
SIGNAL PATH FOR ECHO LO, MID & HI EFFECTS:
DELAY MULTI
SIGNAL PATH FOR ALL OTHER EFFECTS:
MULTI DELAY
MULTI:
NAME
DESCRIPTION
Chorus w/low depth
SAVE/TAP BUTTON CONTROLS:
speed: 1 cycle/tap - tap period: .05–1 second
speed: 1 cycle/tap - tap period: .05–1 second
speed: 1 cycle/tap - tap period: .05–1 second
speed: 4 cycle/tap - tap period: .05–1 second
speed: 4 cycle/tap - tap period: .05–1 second
speed: 4 cycle/tap - tap period: .05–1 second
speed: 2 cycle/tap - tap period: .05–1 second
speed: 2 cycle/tap - tap period: .05–1 second
speed: 2 cycle/tap - tap period: .05–1 second
speed: 1 cycle/tap - tap period: .05–1 second
speed: 1 cycle/tap - tap period: .05–1 second
speed: 1 cycle/tap - tap period: .05–1 second
n/a
Chorus LO
Chorus MID
Chorus HI
Flange LO
Flange MID
Flange HI
Phaser LO
Phaser MID
Phaser HI
Vibrato LO
Vibrato MID
Vibrato HI
Octave Down
Touch Wah
Reverse Wah
Bypass
Chorus w/medium depth
Chorus w/high depth
Flanger w/low depth
Flanger w/medium depth
Flanger w/high depth
Phaser w/low feedback
Phaser w/medium feedback
Phaser w/high feedback
Vibrato w/low depth
Vibrato w/medium depth
Vibrato w/high depth
Adds signal one octave lower
Touch-sensitive wah-wah
Inverted wah-wah
n/a
n/a
n/a
Dry signal - no effect
DELAY:
NAME
DESCRIPTION
SAVE/TAP BUTTON CONTROLS:
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
time: .05–1 second
Single LO
Single MID
Single HI
Single MAX
Echo LO
Echo MID
Echo HI
Echo MAX
Tape LO
Single delay w/low level
Single delay w/medium level
Single delay w/high level
Single delay w/maximum level
Echo w/low level
Echo w/medium level
Echo w/high level
Echo w/maximum level
Tape echo w/low level
Tape echo w/medium level
Tape echo w/high level
Tape echo w/maximum level
Echo w/low level, before multi effect
Echo w/medium level, before multi effect
Echo w/high level, before multi effect
dry signal - no effect
Tape MID
Tape HI
Tape MAX
Echo FX LO
Echo FX MID
Echo FX HI
Bypass
time: .05–1 second
time: .05–1 second
n/a
7
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
Storing Your Own Presets:
Each channel of the GTX65 has two factory assigned DSP presets, as shown on
pages 10 and 11. No matter what the settings of the DSP controls, the preset is recalled
when a channel is selected. You may change the DSP settings by rotating the DSP con-
trols - these changes will remain active until a different channel is selected, but will not
be there for later use unless they are saved. To save a new DSP preset to a channel,
first make the desired DSP changes. Then press and hold the Save/Tap button for about
three seconds. The Save/Tap LED will flash through three quick sequences, indicating
the preset was saved. The new preset is stored for that channel and will remain in mem-
ory until a new preset is stored for that channel or the factory presets are restored.
We recommend making copies of page 14 of this manual for the purpose of writing down your own presets.
CHANGES ARE
SAVED AS
NEW PRESET
Restoring the Factory Presets:
The factory assigned DSP presets may be restored, erasing any changes you have
made. Turn the amplifier off. Press and hold the Save/Tap button as you turn the amplifi-
er on. The Save/Tap LED will flash through two quick sequences, indicating the factory
presets have been restored.
More About the Save/Tap Button:
The Save/Tap button is used to set the tempo of an effect by pressing it twice within
a one second time frame. The time between the two taps sets the timing of the effect. If
the Save/tap button is pressed an odd number of times (once, three times, etc.), the tim-
ing will default to the maximum one second time period.
The Multi effects and the Delay effects may each have a different tap speed. The
default “target” for the Save/Tap button is the Delay control. To select the Multi control as
the tap button’s target, rotate the Multi control. The Save/Tap tempo function will auto-
matically revert back to the Delay control 16 seconds after the Multi control is rotated, or
when the tap speed was last changed for the Multi effect.
NOTE: In most cases, it is usually more pleasing to the ear to set a slower tap speed for the HI effects and
a faster tap speed for the LO effects.
8
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
Using the Footswitch for More Presets:
The Crate three-button footswitch supplied with the GTX65 allows access to an addi-
tional DSP preset for each channel of the amplifier. When the footswitch is connected to
the amplifier as shown below, the “original” DSP presets are active for each channel
when the #3 footswitch LED is illuminated. These are referred to as “DSP Bank ‘A’.”
When the #3 button is switched and the LED is out, a second DSP preset may be stored
and recalled for each channel - “DSP Bank ‘B’.”
NOTE: DSP Bank “B” presets are only accessible when the footswitch is connected to the amplifier. When
the footswitch is not connected, only DSP Bank “A” is accessable.
100VAC:T2.5A
120VAC:T2A
230/240VAC:T1.25A
250V
250V
EXTENSION
SPEAKER
DSP
CHANNEL
INSERT
250V
BANK A
BANK B
CLEAN
SOLO/RTHM
CAUTION: TO REDUCETHE RISK OF FIRE,
REPLACE FUSE WITH SAME TYPE AND RATING.
ATTENTION: UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE.
FOOTSWITCH
"LEFT" jack
"RIGHT" jack
1
2
3
LED on = SOLO/
RHYTHM CH.
BANK "A"
LED off = RHTYHM CH.
LED off = CLEAN
CH.
LED off = DSP
BANK "B"
Only when Switch #2
is activated (LED lit)!
9
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
DSP Factory Presets:
The GTX65 Factory Presets for the DSP section are as follows:
Factory Preset 1: Clean w/Chorus, Delay,Reverb
CHANNEL: SOLO
RHYTHM
TAP Tempo MEDIUM
TAP Tempo MEDIUM
CLEAN
BANK: "A"
"B"
Factory Preset 2: Rhythm w/Slapback Delay
CHANNEL: SOLO
RHYTHM
TAP Tempo FAST
TAP Tempo N/A
CLEAN
BANK: "A"
"B"
Factory Preset 3: Solo w/Flange,Delay,Reverb
CHANNEL: SOLO
RHYTHM
TAP Tempo MEDIUM
TAP Tempo MEDIUM
CLEAN
BANK: "A"
"B"
10
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
DSP Factory Presets:
The GTX65 Factory Presets for the DSP section are as follows:
Factory Preset 4: Clean w/Reverb
CHANNEL: SOLO
RHYTHM
TAP Tempo N/A
TAP Tempo N/A
CLEAN
BANK: "A"
"B"
Factory Preset 5: Rhythm w/Reverb
CHANNEL: SOLO
RHYTHM
TAP Tempo N/A
TAP Tempo N/A
CLEAN
BANK: "A"
"B"
Factory Preset 6: Solo w/Reverb
CHANNEL: SOLO
RHYTHM
TAP Tempo N/A
TAP Tempo N/A
CLEAN
BANK: "A"
"B"
11
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
Suggested Settings:
TAP Tempo MEDIUM
TAP Tempo N/A
"Haze Faze"
Rhythm with
Phase
& Reverb
OUT
IN
TAP Tempo N/A
TAP Tempo N/A
"Solo Wah"
Solo with
Wah, Delay
& Reverb
IN
IN
TAP Tempo N/A
TAP Tempo N/A
"Octanator"
Solo with
Octave
& Reverb
IN
IN
12
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
Suggested Settings:
TAP Tempo MEDIUM
TAP Tempo N/A
"Haze Faze"
Rhythm with
Phase
& Reverb
OUT
IN
TAP Tempo N/A
TAP Tempo N/A
"Solo Wah"
Solo with
Wah, Delay
& Reverb
IN
IN
TAP Tempo N/A
TAP Tempo N/A
"Octanator"
Solo with
Octave
& Reverb
IN
IN
13
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
DSP “Fill in the Blanks” (User Settings):
Copy this page to fill in your own DSP Presets!
User Preset: _________________________________
CHANNEL: SOLO
RHYTHM
TAP Tempo __________
TAP Tempo __________
CLEAN
BANK: "A"
"B"
User Preset: _________________________________
CHANNEL: SOLO
RHYTHM
TAP Tempo __________
TAP Tempo __________
CLEAN
BANK: "A"
"B"
User Preset: _________________________________
CHANNEL: SOLO
RHYTHM
TAP Tempo __________
TAP Tempo __________
CLEAN
BANK: "A"
"B"
14
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
System Block Diagram:
BUFFER
INPUT
CLEAN CHNL
VOL LOW MID HIGH
SOLO-RTHM/
CLEAN
SELECT
SOLO
SOLO
RTHM
RTHM
SOLO
SOLO
RTHM
SWITCHING
CIRCUIT
LEVEL
SOLO/ RTHM
SELECT
RTHM
LEVEL
SOLO
GAIN
RTHM
GAIN
SHAPE
LOW MID HIGH
MIX
AMP
INSERT
REVERB
POWER
AMP
TAP
SPEAKER
MULTI
DELAY
CD
INPUT
EXT.
SPEAKER
DAMPING
CIRCUIT
15
GTX65 Three-Channel Guitar Amplifier with Advanced DSP
GTX65 TECHNICAL SPECIFICATIONS:
Output Power Rating
Speaker Size and Rating
Input Impedance
65W RMS @5% THD, 8Ω, 120 VAC
(1) Custom Design 12”, 8Ω
470kΩ
Total System Gain
Solo Ch
Rhythm 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
Shape Control
Rhythm Channel
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
120 VAC, 60Hz, 90VA
100/115VAC, 50/60Hz, 90VA;
230VAC, 50/60Hz, 90VA
Size and Weight
17-1/2” H x 20” W x 11” D, 34 lbs.
The GTX65 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.
Declaration Of Conformity
#30, Effective 01-01-2001
Manufacturer’s Name:
Production Facility:
SLM Electronics
11880 Borman Drive, St. Louis, MO 63146, USA
700 Hwy 202 W, Yellville, AR 72687, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
Production Facility:
Shipping Facility:
Office Facility:
Product Type:
Audio Amplifier
Complies with Standards:
LVD:
Safety:
EMC:
92/31/EEC, 93/68/EEC, & 73/23/EWG
EN60065
EN55013, EN55020, EN55022, EN61000-3-2,
& EN61000-3-3
Supplementary information provided by:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
@2003 SLM Electronics, a division of St. Louis Music, Inc • 1400 Ferguson Avenue • St. Louis, MO 63133
47-475-07 • 021803
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