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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

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

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

?????????

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

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

?????????

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

5

Modern guitar players use a wide variety of tones. The 
following setting suggestions will serve as a starting point 
to help you find these tones for different styles of music. 
Don’t be afraid to experiment and “tweak” the controls 

to get the most out of your lead guitar amplifiers. If a 
particular control setting is not shown, then it doesn’t 
apply to the sound setting.)

SUGGESTED TONE SETTINGS

CLEAN:

 Clean Channel. These settings are good for clean 

sounds including rhythm guitar, country lead guitar, and 
funk rhythm sounds. Country and Funk sounds generally 
call for a brighter, more treble-edged setting. This setting 

sounds great with single coil pickups. Rhythm guitar is 
commonly a clean, full sound, using a little less treble 
than the country or funk sound and a bit more midrange. 
Humbucking pickups will create a fatter sound. 

MEDIUM–GAIN ROCK & BLUES:

 Lead Channel. This 

setting is useful for blues or classic rock songs. Medium-
gain works well for leads, rhythm parts, and power chords. 
The Lead channel must be selected to engage the gain 
control for distortion. Blues music calls for lower gain 

settings and a bit more treble. Classic rock uses more gain, 
bass and midrange. Adjust the gain dial to the amount of 
distortion you desire. Increasing the Treble will help you 
cut through the band.

ALTERNATIVE/HARD ROCK:

 Lead Channel. For 

both rhythm and lead sounds, this setting will give you a 
fat distortion sound. If you need more “crunch”, increase 
the gain control for more distortion. These styles of music 

require a thick, harder edged tone that fills out the band’s 
sound. Adding more gain will increase thickness and 
sustain. Increasing the bass and decreasing the mids will 
give you a slightly fatter low end.

Summary of Contents for GT50H

Page 1: ...GT50H OWNER S MANUAL 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 50 WATT TUBE GUITAR AMPLIFIER...

Page 2: ...ay cause permanent hearing loss Individuals vary considerably to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise over time According to O...

Page 3: ...reby represents and warrants that any tube components of this product shall be free from defects in materials and workmanship including implied warranties of merchantability or fitness for a particula...

Page 4: ...ls 8 TREBLE This control increases or decreases treble frequencies for both channels 9 LEAD VOLUME This control adjusts the relative volume of the Lead channel 10 PRESENCE This control adjusts the upp...

Page 5: ...e 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 B...

Page 6: ...ification P O Box 5111 Thousand Oaks CA 91359 5111 www acousticamplification com 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 GT50...

Page 7: ...ower 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 sat...

Page 8: ...ement from time to time to maintain top performance of your amplifier If you are not sure about the operating condition of your tubes take the amplifier to a qualified professional for evaluation of t...

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