w w w . a c o u s t i c a m p l i f i c a t i o n . c o m
G T 5 0 H U S E R ’ S M A N U A L
L E A D S E R I E S G U I TA R A M P S
6
HEAVY METAL/MAXIMUM GAIN:
Lead Channel.
Modern Heavy Metal is known for high gain distortion
and a signature “scooped” midrange sound. Start with
the Gain control at maximum and the “High Gain” switch
engaged. This gives you full distortion. Next, reduce the
mid frequency level. If you really want a more intense
“scooped” sound, roll back the mid control all the way and
boost the bass and treble controls. Fine adjustment of all
three tone controls will give you access to a wide variety of
heavy tones. Increasing the midrange will make the guitar
cut through better for leads while pulling out mid range
will give you the extreme “scooped” sound popular in the
heaviest of heavy metal styles.
POWER
STANDBY
25W PENTODE
12W TRIODE
MASTER
REVERB
CLEAN
PRESENCE
LEAD
VOLUME
INPUT
CLEAN
VOLUME
NORMAL
HIGH
GAIN
LOW
GAIN
GAIN
GT50H
BASS
MID
TREBLE
Tube Lead
Series
LEAD
50W PENTODE
25W TRIODE
AC IN
FUSE
FOOT
SWITCH
CHANNEL
HIGH/LOW GAIN
REVERB
BOOST
SEND
RETURN
FX LOOP
MIX
SPEAKERS
16 0HM
DESIGNED IN CALIFORNIA
MADE IN CHINA
Acoustic Amplification
P.O. Box 5111
Thousand Oaks, CA 91359-5111
www.acousticamplification.com
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BOOST
LEVEL
DRY WET
MODE
TRIODE / PENTODE
TRIODE
25W
12W
PENTODE
50W
25W
4 0HM
OR
8 0HM
8 0HM
&
8 0HM
OR
16 0HM
16 0HM
&
GT50H
HEATER
250V/T 5A
ANODE
250V/T 500mA
CAUTION:
ENSURE THE DEVICE IS DISCONNECTED
FROM THE MAINS BEFORE REPLACING
THE FUSE. ONLY USE FUSES OF THE
SAME TYPE AND RATING.
~120V AC 50/60Hz 150W
T3.15AL/250V FUSE
BRIGHT
SPECIAL FEATURES
POWER TRANSFORMER SWITCH:
The half power
transformer switch literally switches the GT50H between
“full power” (50 watts) and “half power” (25 watts). This
feature is useful in rehearsal or smaller performance venues
to reduce the volume of the amplifier while maintaining
the tone and allows the user to “push” the power tubes to
full saturation at a lower level.
TRIODE/PENTODE SWITCH:
Switching between
Triode and Pentode changes the operating mode of the
power tubes in your GT50H. Triode mode will give a darker
tone and earlier breakup of the power tubes. Pentode
mode give a crisper, brighter tone with less breakup of the
power tubes. Triode mode also reduces the power output
of the GT50H by about half and can be used in conjunction
with the half power transformer switch. For Example:
If the GT50H is set to half power on the transformer
switch (25 watts) and set to Triode mode, the amplifier is
effectively running at about 12.5 watts. This can also be
very useful in small performance venues, rehearsals and
recording situations. Experiment with combinations of
transformer power settings and Triode/Pentode settings to
find the tone & volume settings that work best for you.
CAUTION: The Standby switch should be turned to the off
position when changing the position of the Half Power
Transformer switch or the Triode/Pentode switch in order
to protect the amplifier and extend the life of the tubes.
BOOST FUNCTION:
The GT50H has a Boost function
that can be accessed through the GFS4 footswitch and
controlled by the Boost Level control on the rear panel
of the GT50H. The boost function is effectively a variable
lead boost. For best results, set the Master volume level
high and the Clean and Lead channel volumes at the
appropriate volume. When the boost function is engaged,
it gives up to an additional 15dB of volume which can be
useful for making lead guitar parts and solos cut through
when playing with a band. Adjusting the Boost Level
control on the rear panel of the GT50H varies the amount
of additional volume.
