Johnson Acoustic 50R Manuale utente
Vintage Series Acoustic Ampli er
INSTRUCTION MANUAL
MODEL:
Acoustic 50R
2
PANEL FUNCTIONS
INTRODUCTION
Thank you for choosing this Johnson amplifier. Please read this manual
carefully
and completely before operating your new amplifier.
1
INPUT JACK
Connect the cable from your instrument’s output jack to this
jack. Always use an undamaged, shielded instrument cable.
2
LEVEL LED INDICATOR
This LED lights when the instrument’s signal into the preamp
approaches its clipping point (when it is starting to distort).
Adjust the Gain control so that it only flashes occasionally.
3
GAIN CONTROL
This serves as an input level control. For the best sound pos-
sible, the level LED indicator (2) should flash occasionally as
you play.
Note: You may not hear any sound unless the other knobs
are turned up, please see (10) Level Control for controlling
the volume.
4
LO-TRIM CONTROL
Used to adjust the bass response from your instrument.
Note: Excessive bass boost can cause an unnatural “howl-
ing” effect and should be avoided.
5
HI-TRIM CONTROL
Used to adjust high notes and harmonic overtone response
from your instrument.
3
6
NOTCH FILTER CONTROL
Use this control to eliminate instrument feedback. If there
is no feedback, leave the control at the ‘Zero” position (fully
counter-clockwise.)
If you do encounter feedback, rotate the control clockwise
until the feedback is gone.
7
NOTCH FILTER IN/OUT BUTTON
This button engages and disengages the Notch Filter. To
eliminate feedback make sure this button is pressed in.
8
SPRING REVERB CONTROL
Controls the depth of the spring reverb effect. As you rotate
the control clockwise the amount of reverb effect increases.
9
PRE-SHAPE IN/OUT BUTTON
When depressed, this “shaping” button serves as a mid-cut
control, adding fullness and punch to your sound.
10
LEVEL CONTROL
Used to adjust the overall output volume of the amp. Use
this control along with the output volume control on your
instrument to achieve a balanced volume from your instru-
ment.
Note: As you approach maximum output, decrease the Lo-
Trim control.
11
POWER INDICATOR LIGHT
LED glows when the unit is turned on.
12
LINE OUT JACK
Used to connect the the amp to a house soundboard, a record-
ing console, an electronic tuner, or an external power amp.
13
FOOTSWITCH JACK
Used to connect a single button footswitch for remote ON/
OFF control of the internal Spring Reverb effect.
14
POWER SWITCH
This switch turns the unit ON and OFF.
4
SUGGESTED SETTINGS
Acoustic Guitar
Acoustic Rock Guitar
Keyboard/Piano
Keyboard/Piano/Organ
Acoustic Bass
*PreShape In/Out Button
Out
In
In
5
TECHNICAL SPECIFICATIONS
POWER SUPPLY
110/115VAC/50Hz~60Hz
POWER OUTPUT:
35 watts RMS @ 8 ohms
LOAD IMPEDANCE:
8 ohms
INTERNAL SPEAKER:
8” Woofer & 2” Tweeter
INPUT:
1/4” Mono Jack
LINE OUT:
1/4” Mono Jack
FOOTSWITCH:
1/4” Mono Jack
DIMENSIONS:
16 1/2”(W) x 16”(H) x 91/
4”(D)
WEIGHT
(approx.):
25.5 lbs.
6
PRECAUTIONS
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 of power supply to your home, consult your
product dealer or local power company.
INSERTION WARNING
Never place objects of any kind into this product 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 the product.
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.
HEAT
The product should be placed away from heat sources,
such as radiators, heat registers, stoves, or other products
that produce heat.
CLEANING
Unplug this product from the wall outlet before cleaning. Do
not use liquid cleaners or aerosol cleaners. Use a damp
cloth for cleaning.
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 condi-
tion.
7
SAFETY PRECAUTIONS
WARNING
CAUTION: TO REDUCE THE RISK OF
FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS AMPLIFIER TO RAIN OR
MOISTURE. DANGEROUSLY HIGH
VOLTAGE IS PRESENT INSIDE THE
ENCLOSURE. DO NOT OPEN THE
CABINET. REFER SERVICING TO
QUALIFIED PERSONNEL ONLY.
This symbol warns the user of danger-
ous voltage levels localized within the
enclosure.
This symbol advises the user to read
all accompanying literature for safe
operation of the unit.
WARRANTY INFORMATION
This amplifier is warranted, to the original Purchaser, to be free
from defects in material and workmanship for a period of five
(5) years from the original retail purchase. This warranty is
valid in North America only.
The manufacturer shall, at its option, either repair or replace the
defective product if the product is returned to the original place
of purchase. If any product returned is not defective within this
warranty, the manufacturer shall so advise the Purchaser and
thereafter shall dispose of said product in accordance with the
Purchaser’s instructions and at the Purchaser’s cost. This war-
ranty is not transferable by the Purchaser.
The warranty shall not apply to wearable parts, these items
include, but are not limited to, amplifier knobs, feet, and
handles.
This warranty shall not apply if the product has been misused
or damaged as a result of neglect, abuse, alteration, improper
handling, unauthorized repair or modification, accident or
causes external to the product, such as, but not limited to, exces-
sive heat or humidity.
The manufacturer’s sole and exclusive maximum liability for
any claim by the Purchaser, shall not exceed the wholesale value
of the product. In no event shall the manufacturer be liable for
any indirect, incidental, collateral, exemplary, or consequential
damages or losses arising out of the Purchaser’s purchase of the
product. The above limitations may not apply in some states.
PRINTED IN CHINA
Indice
Altri manuali Johnson Amplificatore
