O W N E R ’ S M A N U A L
GTH-100
Tube Guitar Head Amp w/ Reverb
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WARNING
An equilateral triangle enclosing a lightening flash/arrowhead symbol is
intended to alert the user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure which may be of sufficient
magnitude to constitute a risk of electric shock.
ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR
:
An equilateral triangle enclosing an exclamation point is intended to alert
the user to the presence of important operating and service instructions in
the literature enclosed with this unit.
IMPORTANT SAFETY INSTRUCTIONS
When using this electronic device, basic precautions should always be taken, including the following:
1. Read all instructions before using the product.
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement, or near a
swimming pool, etc.).
3. This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling.
4. This product, in combination with headphones or speakers, may be capable of producing sound levels that
could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a
level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an
audiologist.
5. The product should be positioned so that proper ventilation is maintained.
6. The product should be located away from heat sources such as radiators, heat vents, or other devices
(including amplifiers) that produce heat.
7. The product should be connected to a power supply only of the type described in the operating instructions or
as marked on the product. Replace the fuse only with one of the specified type, size, and correct rating.
8. The power supply cord should: (1) be undamaged, (2) never share an outlet or extension cord with other
devices so that the outlet’s or extension cord’s power rating is exceeded, and (3) never be left plugged into
the outlet when not being used for a long period of time.
9. Care should be taken so that objects do not fall into, and liquids are not spilled through, the enclosure’s
openings.
10. The product should be serviced by qualified service personnel if:
A.
B.
The power supply cord or the plug has been damaged.
Objects have fallen into, or liquid has been spilled onto the product.
C. The product has been exposed to rain.
D. The product does not appear to operate normally or exhibits a marked change in performance.
E.
The product has been dropped, or the enclosure damaged.
11. Do not attempt to service the product beyond what is described in the user maintenance instructions. All
other servicing should be referred to qualified service personnel.
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INSTALLATION
To ensure years of enjoyment from your NADY AUDIO GTH-100, please read and understand this manual thoroughly before
using the unit.
INSPECTION
Your NADY AUDIO GTH-100 was carefully packed at the factory in packaging designed to protect the units in shipment.
Before installing and using your unit, carefully examine the packaging and all contents for any signs of physical damage
that may have occurred in transit.
[Please note: Nady Systems is not responsible for shipping damage. If your unit is damaged, do not return to Nady, but
notify your dealer and the shipping company (if shipped to you) immediately to make a claim. Such claims must be made
by the consignee in a timely manner.]
CONTENTS
• Instruction manual
• GTH-100 (verify that the unit’s serial number is same as shown on shipping carton)
• FS-2 Dual footswitch
• AC Power cord
• Warranty Card
POWER CONNECTION
The GTH-100 has an internal power supply and is designed to operate from an external AC source. Power requirements
for electrical equipment differ from area to area. Be sure to confirm that the voltage selected by the voltage selector switch
on the back panel is proper for your area (120VAC/60 Hz or 230VAC/50Hz) per the information below:
Europe (except UK): 230V, 50Hz
UK and Australia: 240V, 50Hz
USA and Canada: 120V, 60 Hz
For other areas, please check with local authorities.When ready to operate, plug the AC cord into the power source. Make
sure that the unit is turned off before connecting to the AC power source to avoid possible loud transients that can
damage your speakers or your ears, especially when monitoring with headphones.
LEGAL INFORMATION
NOTICE
The information in this document is subject to change, as the Company may make changes to product in order to improve
reliability, design, or function, without prior written notice. No part of this manual may be reproduced or transmitted in any form
or by any means without the written permission of the company.
IN NO EVENT WILL THE COMPANY BE LIABLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES,
WHETHER ARISING DIRECTLY OR INDIRECTLY, SUCH AS LOSS OF PROFIT OR GOOD WILL, THAT MAY BE
SUFFERED IN CONNECTION WITH THE PURCHASE OF THIS PRODUCT OR FROM THE BREACH OF ANY
REPRESENTATION OR WARRANTY.
LICENSE
The Company grants the customer a non-exclusive, non-transferable license to use the software, if any, accompanying this
product for internal use on a single computer system. The end user may make a single copy of the software solely for backup
purposes; otherwise, no copies may be made of the software or any part thereof. No other license of any kind is granted to
any part of the product or any of the intellectual property therein.
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FRONT CONTROLS AND CONNECTIONS
(6)
(11)
(12)
(10)
(3) (2) (1)
(8)
(4) (5)
(7)
(9)
(13)
1. POWER SWITCH
This switch turns the main power on and off. Flipping
Note: The VOLUME and MASTER controls also affect
the final signal level and the amount of distortion.
the toggle switch up to the ON+ position will turn on the
amp “in phase” with the main AC line voltage. Flipping
the switch down to the ON- position will reverse the
polarity. In some cases, AC hum (caused by ground
loops) can be reduced by reversing the polarity. Select
the On position which has the least amount of AC hum.
• For cleanest operation (least distortion) adjust the
VOLUME to a very low setting, the MASTER to
maximum, and the DISTORTION to Position 1.
• For medium distortion (or crunch) adjust the
VOLUME to past the mid position, the MASTER to
mid, and the DISTORTION to Position 2.
2. POWER INDICATOR LIGHT
Lights when the unit is powered on.
• For maximum distortion adjust the VOLUME to
maximum, the MASTER to a very low setting, and
the DISTORTION to Position 3.
3. HI / STBY / LO SWITCH
Flipping this toggle switch to the STBY position will
respectively disable the audio to the amplifier and the
outputs and put the amp in standby mode. This allows
for proper warm-up of the tubes before applying signal to
them, and allows the amp to stay warm when not in
immediate use. To extend the life of the tubes, always
turn the Main Power Switch on first, for 1-2 minutes,
before flipping the Standby Switch to LO or HI. Set the
switch to LO, which will enable audio with a maximum of
30W RMS output power, if the highest volume is not
necessary, or, if you want to achieve more distortion at
the output tubes. Flipping the switch to HI will enable
audio to the amplifier with a maximum 100W RMS
output.
7. VOLUME CONTROL
This adjusts the level of the input signal to the amp.
Increasing this level will create distortion dependent on
the DISTORTION SELECTOR setting.
8. MASTER VOLUME CONTROL
Adjusts overall loudness of the amp.
9. TREBLE CONTROL
Adjusts the level of treble/Hi frequencies.
10. MID CONTROL
Adjusts the level of mid-range frequencies.
4. HIGH INPUT JACK
Input for instrument outputs like passive guitar outputs,
keyboard, mics for harmonicas, and other effects
devices.
11. BASS CONTROL
Adjusts the level of bass frequencies.
12. PRESENCE CONTROL
Adjusts the high overtones, texture, and feel of the amp.
5. LOW INPUT JACK
The Low Input Jack has a pad with approx 9dB with
lower gain than the High Input Jack. This should be
used with higher level electronic devices or to achieve
more range from the gain controls before distortion.
13. REVERB CONTROL
Adjusts the level of reverb mixed with the dry signal.
6. DISTORTION SELECTOR
This three-way switch selects the input sensitivity and
amount of overdrive distortion. Position 1 offers the
cleanest signal with least amount of distortion. Position
3 has the maximum amount of distortion.
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REAR CONTROLS AND CONNECTIONS
(4)
(1)
(2) (3)
(6)
(7)
(5)
1. POWER CONNECTION
5. SPEAKER OUTPUTS
Power output jacks for
connecting to 4Ω, 8Ω, and
16Ω speaker cabinets.
Although compatible with
many cabinets, for best
results it is recommended
that the GTH-100 be used
to power the matching
GAC-412 cabinet (8Ω),
A standard IEC AC power socket for connecting to the
main AC supply. The IEC power socket has an integral
fuse holder that takes a 20mm fuse.
NOTE:
• Always replace a blown fuse with the same type
as specified on the rear panel and under
Specifications (pg. 7) for the corresponding AC
voltage being used.
which utilizes (4x) 12” Nady
PowerDrive™ speakers for
optimum tone and
• Before you connect your GTH-100 to the AC,
please make sure that your local voltage matches
the Voltage Selector Switch.
maximum output.
• Do not remove the center ground conductor.
6. LINE OUT
This line level output signal is derived from the output of
the power amp to incorporate all the characteristics, color
and tonal response of the output tubes. This signal can
be input into any device, such as an audio mixer or
another amplifier, and can be useful in many live sound
or recording applications.
2. VOLTAGE SELECTOR SWITCH
For selecting the proper voltage (115/230VAC) to match
the power supply in your area.
3. HIGH VOLTAGE FUSE
1A 250V fast blow fuse
7. REVERB OUT
4. FOOTSWITCH JACK
A pure reverb signal output. This may be used for
recording by plugging into mixing consoles/recording
devices or for stereo effects by using an outboard amp
and speaker.
For connecting to the included FS-2 dual footswitch. On
the FS-2, the right switch controls the Reverb on/off. The
left switch controls the Lead Boost on/off for adding up to
12dB of gain at the preamp stage. Note: connecting the
FS-2 will automatically decrease the level at the preamp
input stage allowing it to be boosted to a higher
level when the Lead Boost is switched
on.
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SPECIFICATIONS
Power Amp Section ..................................................................................................................................Four EL34 Tubes
Power Output ....................................................................................................100W RMS @ 4Ω — 8Ω — 16Ω 5% THD
Preamp Section ..................................................................................................................................Three 12AX7A Tubes
Input Imp. ........................................................................................................................ HI input 200K Ω, LO input 50K Ω
Input Sens. (1KHz) .................................................................................... HI input max clean 800mV, Max distortion 8mV
LO input max clean 1.6V, Max distortion 16mV
LO Input Attenuation .................................................................................................................................................... 9dB
Lead Boost Range ...................................................................................................................................................... 12dB
Line Output Imp........................................................................................................................................................... 600Ω
Line Output Level .............................................................................................................................................. 1V nominal
Reverb Output Imp. ........................................................................................................................................................ 1K
Reverb Output Level.......................................................................................................................................... 1V nominal
Power Requirements.......................................................................................................... 120 VAC 60Hz, 230 VAC 50Hz
Power Fuse.......................................................................................................................... 5x20mm glass tube, slow-blow
4A/250V for 115VAC, 2A/250V for 230VAC
High Voltage Fuse .................................................................................................................................. 1A 250V fast blow
Dimension ...................................................................................................................... 28” x 10.75” x 9” (71 x 27 x 23cm)
Weight .............................................................................................................................................................. 45 lbs (20kg)
TUBE REPLACEMENT
Preamp Tubes 12AX7A — No adjustment required
Output Tubes EL34 — After replacing output tubes, output tubes bias voltage should be checked with Standby switch
set to On, no signal input, and all controls set to minimum. If output tube bias voltage is not correct, amplifier will sound
unusually distorted with mushy audio and output tubes may overheat. Normal output tube bias voltage should be -46VDC
on Pin 5 of all output tubes. For best results use matched output tubes.
Caution: Do to dangerously high voltage, these adjustments should only be made by qualified technician.
The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit, including design
and appearance, are subject to change without prior notice.
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SERVICE FOR YOUR NADY AUDIO PRODUCT
(U.S.) Should your NADY AUDIO product require service, please contact the Nady Service Department via
telephone at (510) 652-2411, or e-mail at [email protected].
(International) For service, please contact the NADY AUDIO distributor in your country through the dealer from
whom you purchased this product.
DO NOT ATTEMPT TO SERVICE THIS UNIT
YOURSELF AS IT CAN BE DANGEROUS
AND WILL ALSO VOID THE WARRANTY.
NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET, EMERYVILLE, CA 94608
Tel: 510.652.2411 • Fax: 510.652.5075 • nady.com
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