Owner’s Manual
ZT Amplifiers
Club
IMPORTANT SAFETY INSTRUCTIONS
CAUTION
RISK OF ELECTRIC SHOCK
DO NOTO PEN
CAUTION: TO REDUCE RISK OF ELECTRICALS HOCK, DO NOT REMOVE COVER (OR BACK).
NO USER SERVICEABLEP ARTS INSIDE. REFER TO QUALIFIED SERVICE PERSONNEL.
The lightning flash with the arrowhead symbol, within an equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating
and maintenance (servicing) instructions in the literature accompanying the appliance.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO
RAIN OR MOISTURE.T HE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING AND THAT
NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHALL BE PLACED ON THE APPARATUS.
1. READ INSTRUCTIONS - All safety and operating instructions should
be read before the appliance is operated.
2. RETAIN INSTRUCTIONS - Safety and operating instructions should
be retained for future reference.
3. HEED WARNINGS - All warnings on the appliance and in operating
instructions should be adhered to.
4. FOLLOW INSTRUCTIONS - All operating and use instructions should
be followed.
5. WATER AND MOISTURE- The appliance should not be used near
water - near bathtub, washbowl, kitchen sink, laundry tub; in a wet
basement near a swimming pool, etc.
6. CARTS AND STANDS - Do not place this product on an unstable cart,
stand, tripod,
bracket, or table. The appliance should be used only with a cart or
stand that is
recommended by the manufacturer.
7. VENTILATION - The appliance should be situated so that its location
and position do not interfere with proper ventilation. The appliance
should not be situated on a bed, sofa, rug, or any surface that may
obstruct cabinet openings.
8. HEAT- The appliance should be situated away from heat sources
such as radiators, heat registers, stoves, or other devices (including
amplifiers) that produce heat.
9. POWER SOURCES - This product should be operated only from the
type of power source indicated on the marking label. If you are not sure
of the type power supply in your home, consult your product dealer or
local power company. For products intended to operate from battery
power or other sources, refer to the operating instructions.
10. POWER CORD PROTECTION - Power supply cords should be
routed so that they are not likely to be walked upon or pinched by items
placed upon or against them, paying attention to cords and plugs,
convenience receptacles, and the point where they exit from the
appliance.
11. POLARIZED PLUG - This appliance is equipped with a polarized line
plug (a plug having one blade wider than the other). This plug will fit into
the power outlet only one way. This is a safety feature. If you are unable
to insert the plug fully into the outlet, try reversing the plug. If the plug
still fails to fit, contact your electrician to replace your obsolete outlet. Do
not attempt to defeat this safety feature.
12. LIGHTNING - For added protection for this product during a lightning
storm, or when it is left unattended and unused for long periods of time,
unplug it from the wall outlet and disconnect the antenna or cable system.
This will prevent damage to the product due to lightning and power line
surges.
13. OVERLOADING - Do not overload wall outlets, extension cords, or
integral convenience receptacles, as this can result in a risk of fire or electric
shock.
14. CLEANING - Unplug this product from the wall outlet before cleaning.
Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for
cleaning.
15. NON-USE PERIODS - This amplifier should be unplugged from the
outlet when the appliance is left unused for a long period of time.
16. OBJECTA ND LIQUID ENTRY - Never push objects of any kind into this
product through openings, as they may touch dangerous voltage points or
short-out parts that could result in a fire or electric shock. Never spill liquid of
any kind on this product.
17. DAMAGE REQUIRING SERVICE - The appliance should be serviced by
qualified personnel when:
a. The power supply cord or plug has been damaged; or
b. Objects have fallen on or liquid has been spilled into the
appliance; or
c. The appliance has been exposed to rain; or
d. The appliance does not appear to operate normally or exhibits
a marked change in performance; or
e. The appliance has been dropped or the enclosure is damaged.
18. SERVICING - Do not attempt to service this product yourself, as
opening or removing covers may expose you to dangerous voltage or other
hazards. Refer all servicing to qualified service personnel. For service
warranty information call the ZT Amplifiers service number:
1-510-704-1868.
19. REPLACEMENTP ARTS - When replacement parts are required, be
sure the service technician has used replacement parts specified by the
manufacturer or that have the same characteristics as the original part.
Unauthorized substitution may result in fire, electric shock, or other hazards.
20. SAFETY CHECK - Upon completion of any service or repairs to this
product, ask the service technician to perform safety checks to determine
that the product is in proper operating condition.
CAUTION
TO PREVENTE LECTRICAL SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD, RECEPTICLE OR
OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE
Turn clockwise to
increase the treble
Turn clockwise to
increase the bass
Adjusts the
Reverb level
REVERB
BASS
TREBLE
VOLUME
Adjusts level
of the amplifier
Adjusts level
of distortion
GAIN
INPUT
1/4" plug in
connection
for instrument
LED - Lit when
amplifier is on
1/4" plug in
connection for
external speaker
1/4" plug
connections
for the external
Effects Loop
Adjusts the
loudness of
the headphone/
line out
EFX
C
LUB
Guitar Amplifier CLG1S
OUT
IN
Speaker
Out
Volume
8 Ω Minimum
ZT Amplifiers, Inc.
Berkely, CA 94710
USA
Out
Voltage
Selects amplifier
operating voltage
115V or 230V
Speaker
On
Power
Off
FUSE T2AL 250V
On
Off
1/4" plug in
connection for
headphone/
line out
Turns power
on and off
Aux
Input
Turns speaker
on and off
1/8" plug in
connection
for Mp3 Player
Plug in power cord connection
Fuse - Protects the amplifier from electrical
faults. Replace only with the same type and
rating as listed on the fuse
Welcome to The Club, and congratulations! The Club is ZT Amplifiers’ premium,
stage-ready musical instrument amplifier. It offers a no-compromise output level and
frequency range while remaining true to the ZT design spirit of compact and lightweight
gear for the real world.
Like all ZT products, the Club is simple and intuitive enough to allow anyone to plug
and play without much effort. However, reading this document can help you get more
out of your amp, and take your sound to new places.
Design Philosophy:
The Club is further proof that ZT has “cracked the code” of fine amp sound. Sharing
many basic components with ZT’s Lunchbox, the Club obtains a much higher output
and broader range thanks to its larger speaker and enclosure. It’s an amp that performs
in almost any situation, providing no-compromise sound and tone in situations where
larger amps are not an alternative. And, it’s an amp with a personality all its own; a
flexible and adaptable problem-solver in the hands of a musician. The Club delivers
more, for the player who needs it, wants it, and has to have it.
The ZT Club is the result of many years of study into the sound, feel and science of
the world’s best musical instrument amplifiers. Our goal was not to clone or “model”
any particular product. Rather, we have tried to understand, in a methodical way,
what technical factors give an amp great tone, flexibility and playability. As a group
of experienced audio scientists and passionate musicians, we set out to learn what
makes a classic amp survive for generations, giving artists of many styles and genres
a consistently great playing experience over the years. ZT’s research investigation was
“clean slate.” We didn’t assume we knew any secret, magic formula; we set our own
techno-biases aside. Likewise, we did not assume that conventional wisdom is always
all that wise.
What we found is that guitar amps are fantastically complex systems. Many aspects of
the overall product design interact with one another under real-world playing conditions.
Sections of the electrical circuit influence each other, the electrical system interacts
with the acoustical system, etc. Some of these interactions are well known to amp
aficionados and designers. Others have been underrated, or overlooked entirely. Thus,
we soon came to realize that guitar amps have plenty of mysteries to reveal, and plenty
of room for improvement in areas that musicians would appreciate.
Eventually, ZT started collecting real, practical insight into what makes great amps tick.
In our view, optimization between electrical, acoustical and mechanical subsystems
is the key to bringing more tone, power, smaller size, and lower costs into the picture.
By applying sophisticated technical understanding to overcome limitations that have
previously been considered facts of life, ZT is able to re-write some of the rules
while working in complete harmony with more traditional approaches. We believe it
is time to re-think the fundamental design of the guitar amp, bringing in advanced
audiotechnology without losing the wonderful benefits of proven classics.
The Signal Path:
The main input to the Club is via a standard ¼” input on the top panel. This input has
an impedance of 1MΩ, (2MΩ @ DC), and can accept working signals up to 6Vpp. It
is protected against RF interference and ground-error overloads. After the input stage
preamp, the signal is sent to an analog GAIN pot on the front panel, and then into a
diode overdrive network. Thus, the GAIN knob controls the input sensitivity, and allows
an analog overdrive to be applied to the signal, if desired.
Following this analog input preamp, the signal is converted to 24bit PCM digital at a
44.1 KHz sampling rate. In the digital domain, ZT’s proprietary dynamics and EQ signal
processing are implemented. Also, Treble and Bass tone controls with characteristics
closely following a vintage stack are applied. Finally, adjustable Reverb processing is
done, offering the option of signal echo & decay. At this point, the signal is converted
back to analog and routed to the power amplifier.
The output amp section is carefully designed to constantly adapt to the signal
characteristics and the instantaneous power supply behavior. The amp itself is a pair
of Class A/B output stages, running fully bridged across the speaker load. The result
is very high RMS power, with extraordinary additional peak dynamics on top of that,
together with a natural, progressive overdrive characteristic.
Initial Setup:
When first connecting your Club, before power is applied, please be sure to set the
controls as follows:
¥¥ REVERB set to off. (Fully counter-clockwise.)
¥¥ BASS set to mid-point. (12 o’clock position.)
¥¥ TREBLE set to mid-point. (12 o’clock position.)
¥¥ VOLUME set to off. (Fully counter-clockwise.)
¥¥ GAIN set to mid-point. (12 o’clock position.)
¥¥ SPEAKER switch on rear panel set to “On” position. (Towards left side.)
Now you can apply power, and turn up your instrument to the desired
level using the VOLUME knob.
Gain and Volume Controls:
Normal adjustments to the sound level should be made using the VOLUME control
only. This knob affects the signal levels at all inputs and outputs.
The GAIN control is used to set the amount of signal drive and natural distortion that is
achieved. In almost all cases, this control should be set high up, well above the 50%
point on its range. This will assure a good tone, and low operating noise. The only time
the gain should be turned down is when a very clean tone is needed for an excessively
high signal input, such as when certain external effects units are used with the Club.
The key to low noise is to keep the GAIN knob high, and use the VOLUME knob
to adjust your sound level.
Reverb:
The Club’s Reverb effect is a traditional style reverb effect that simulates the echo and
decay of sound reflections in a room or hall.
The External Speaker Output:
There is a ¼” external speaker output connector on the rear of the Club, which can be
used to power an external cabinet. Please note the following IMPORTANT rules:
¥¥ This output is fully balanced and high power. Connect it only to a
passive speaker cabinet.
¥¥ Do not use this output for recording or connect it to other amps.
¥¥ Use a speaker cabinet rated at 8Ω, or higher.
¥¥ Be sure your external cabinet can handle at least 100W.
EFX Loop:
Allows effects be inserted after the input stage, resulting in a cleaner, more defined
output signal under many conditions.
AUX Input:
The Club can accept a line input from an audio source such as an MP3 player, via
a standard 1/8” Stereo jack on the rear panel, labeled AUX INPUT. This input is not
affected by the GAIN control, but does run through all the other Club controls. The input
impedance is 22KΩ, and the expected signal level is 50mV rms. To adjust the relative
balance between your guitar and your MP3 player, you can use the GAIN control,
or adjust the output level on your player. It is recommended that you disconnect any
cables from the AUX INPUT when it is not in use.
Headphone/Line Level Output
This ¼” Stereo connector can be used to run most stereo headphones. (However,
the signal itself is always mono.) The line output is also useful for running into house
sound, or a recording rig. It has its own level adjustment, so that you can adjust the
level of your phones once the Club controls are set where you want them.
Unlike most headphone outputs, this one doesn’t mute the internal speaker. If you want
to do that, just use the SPEAKER switch. This approach gives you total control of what
is on or off at any given time. For example, you can use the Club to monitor the sound
on stage, even when routing into the board via the line out.
Using The Club With Other Instruments:
The Club is not just for guitars. In fact, the Club loves a very wide variety of instruments
and sound sources. Excellent results have been achieved with acoustic guitar pickups,
slide guitar, harmonica, electric piano, sax, accordion, electronic organ, traditional string
instruments, and synths.
Start with the GAIN, BASS, TREBLE, and REVERB controls all set at midpoint, and the
VOLUME all the way down. Then inch up the VOLUME, step by step. Season to taste.
Because of the high available gain, some acoustic instruments may tend to feedback if
the GAIN control is accidentally set too far up.
Mic’ing The Club:
When making a recording, or running through a house PA, a great sounding amp really
deserves to be mic’d. Direct feeds are convenient, sometimes necessary, but they
rarely capture the full tone the player is hearing. Like all ZT products, the Club’s sound
is a result of a synergistic system, and the internal speaker is an important part of that
system. Getting really good recordings always involves experimentation, but here are
some general tips:
¥¥ Start with the microphone directly in front of the driver’s dustcap, about 6” back
from the grille.
¥¥ Cardioid LD condensers are the first choice, if available.
¥¥ Cardioid SD’s are good, too.
¥¥ An Omni SD can capture a very accurate sound, but you might have move it in
closer to the grille, and play with side-to-side positioning. A spot about halfway
between the center (“dustcap”) and the outer edge (“surround”) of the speaker will
often work well.
¥¥ The classic dynamic guitar amp mics can work, of course, but be prepared to try a
variety of setup positions to get the tonal balance you want.
¥¥ Remember, the Club can be loud, and it concentrates a great deal of sound energy
into a small area. Unless you are an unusually soft player, you will probably have to
engage the pad on your mic.
¥¥ Using a foam windscreen is also a good idea, since the driver can create bursts of
air when driven very hard.
Understanding Amplifier Power:
Nobody has come up with one number that can fully represent the power capability of
a guitar amp. RMS is a very conservative approach, but it misses the issue of dynamic
power and real world musical signals. At the other extreme, Peak Power can readily
be inflated to the point where it is not a reliable indicator of anything. In fact, the actual
power of any given amplifier varies widely at different frequencies. Every amplifier
company has their own procedure for stating the power capability of their products,
which ideally should be done within the boundaries of accepted technical standards
and legal requirements. Here is our thinking on the matter, which we believe results in
specifications that are both conservative and useful.
The internal speaker of the Club is nominally 8Ω, with a DC resistance of 7.2Ω.
Electrically, the amplifier output stage runs differentially, using a 48V rail. The output
stage can source in excess of 41Vp or 28Vrms into the speaker load. This yields the
following typical specs:
Maximum Instantaneous Peak Power: 280W.
Musical Peak Power: 236W.
RMS Power: 130W.
Sustained Average Music Power: 200W.
Finally, Two Words About Modding: Please Don’t.
Sooner or later, most of us get the urge to modify or improve our amps by replacing
various parts. But, remember, the Club is not like other guitar amps. It is a highly
integrated and optimized system, combining electrical, acoustical and mechanical
subsystems. Replacing any element of this combination is sure to upset the balance
and operation of the whole. For example, our speaker driver is fully custom, and built
using special high-power components. You won’t find anything else quite like it. So
enjoy your Club, and please do send us any and all suggestions you have. We take our
customers’ input very seriously. (Oh, and we like compliments, too!)
Thanks!
Technical Support
Technical questions:
Email: WHFKVXSSRUW#]WDPSOL¿HUVFRm
Telephone: 1-925-954-7935
To obtain service for your ZT product:
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determine if your product is within ZT’s warranty coverage period). Your dealer will contact ZT and make arrangements
for repair or replacement of your product.
If you purchased your product directly from ZT, you may call 1-925-954-7935 or complete the Return Authorization form available on ZT’s website.
You will receive a Return Authorization (R.A.) number that must be written clearly on the shipping carton in which product is returned. A copy of the
Return Authorization form must be included inside the carton.
If your product is not within warranty period, you will be advised repair charges.
Limited Warranty
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normal operating conditions for a period of one (1) year from the date of purchase. This limited warranty shall run to the original purchaser
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use of the ZT product only, and does not cover damages caused by misuse, abuse, accidents, or unauthorized service or parts.
IMPORTANT: PLEASE RETAIN YOUR SALES RECEIPT, AS IT IS YOUR PROOF OF PURCHASE COVERING YOUR LIMITED
WARRANTY. TO TRANSFER THE WARRANTY TO A SUBSEQUENT PURCHASER, YOU MUST ENDORSE THE SALE OF THE
PRODUCT TO THE SUBSEQUENT PURCHASER ON THE FRONT OF THE SALES RECEIPT. THIS LIMITED WARRANTY IS VOID
WITHOUT SUCH ENDORSED SALES RECEIPT.
Defective products that qualify for coverage under this limited warranty will be repaired or replaced, at ZT’s discretion, with a like or
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Service Center, with proof of purchase, during the applicable warranty period. You are responsible for shipping the defective product to
the Service Center. Return shipment will be provided at no cost to you; provided, however, that if you are located in a country other than
the United States of America, then you will be responsible for all customs duties, VAT and other associated taxes and charges applicable
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Service Center is not covered by this limited warranty. This limited warranty becomes void if the serial number on any product is defaced
or removed, or the product has been damaged by alteration, misuse, accident, or neglect; or the product has been repaired or serviced
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THE FOREGOING CONSTITUTES THE ONLY WARRANTY MADE BY ZT AMPLIFIERS WITH RESPECT TO THE PRODUCTS AND
IS MADE EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED. Any implied warranties, including without
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jurisdiction are limited to the duration of this limited warranty. This limited warranty also applies to ZT products shipped to
ZT AMPLIFIERS ASSUMES NO LIABILITY FOR PROPERTY DAMAGE RESULTING FROM ANY DEFECT OF THIS PRODUCT NOR
ANY LOSS OF BUSINESS, INCOME, PROFIT, SATISFACTION, OR DAMAGES ARISING FROM THE LOSS OF USE OF SAME DUE
TO DEFECTS OR AVAILABILITY OF SAME DURING SERVICE. NOTWITHSTANDING ANY DAMAGES YOU MIGHT INCUR FOR ANY
REASON WHATSOEVER, THE ENTIRE LIABILITY OF ZT AMPLIFIERS SHALL BE LIMITED TO THE AMOUNT ACTUALLY PAID BY
YOU FOR THE DEFECTIVE PRODUCT.
Some jurisdictions do not allow the exclusion or limitation of damages or limitations on how long an implied warranty lasts, so the above
limitations may not be applicable to you.
EFFECTIVE DATE: December 1, 2008
ZT AMPLIFIERS, INC.
2329 FOURTH STREET
BERKELEY, CALIFORNIA 94710 USA