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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
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
4
GT50H REAR PANEL
1. AC INPUT: Attach the included AC power cable here.
2. MAINS FUSE: Contains the fuse for the amplifier mains.
Replace with the same type and value only.
3. HEATER FUSE: Contains the heater fuse for the preamp
and power amp tubes. Replace with the same type and
value only.
4. ANODE FUSE: Contains the anode fuse for the power
tubes. Replace with the same type and value only.
5. TRIODE/PENTODE SWITCH: Use this switch to select
Triode or Pentode mode for the tubes. CAUTION: The
amplifier should be switched to “STANDBY” before
changing the Triode/Pentode setting.
6. BOOST LEVEL: This adjust the level of the Boost
Function when engaged. This acts as a Lead
Boost of up to 15dB. This function can only be
accessed and turned on with the included GFS4
footswitch attached.
7. FOOTSWITCH JACKS: Connection for the GFS4, 4
button footswitch (included) via a 2 stereo 1/4” cables
(included). Switches Clean/Lead channel, High/Low
Gain, Reverb On/Off & Boost On/Off.
8.
EFFECTS LOOP SEND: Accepts 1/4” instrument
connectors.
9. EFFECTS LOOP RETURN: Accepts 1/4” instrument
connector.
10. EFFECTS LOOP MIX CONTROL: Blends the parallel
effect loop signal with the main dry signal when an
external effect is connected via the effects loop. This
should be set to the “Dry” position when no external
effect is connected.
11. Speaker Jacks for (1) 4 Ohm cabinet or
(2) 8 Ohm cabinets
12. Speaker Jacks for (1) 8 Ohm Cabinet or
(2) 16 Ohm cabinets
13. Speaker Jack for (1) 16 Ohm cabinet.
CAUTION: Do not operate the GT50H without a speaker
cabinet attached to the appropriate speaker jack.
Operating the GT50H without a speaker attached or with
speakers attached to the wrong Ohm rating jacks can
damage the amplifier. Minimum Ohm load for the GT50H
is 4 Ohms. Damage to the GT50H caused by operation
without a speaker cabinet attached or by improper Ohm
load matching is NOT covered under warranty.
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