Thank you for purchasing a Yamaha F-20 Guitar Amplifier.
To get the best results and longest life out of your F-20, we recommend that you
carefully read this manual, and keep it in a safe place for future reference.
To avoid possible damage do not expose the unit to:
direct sunlight
very high or low temperature/humidity
sand or excessive dust
* Especially inside a vehicle, the temperature may rise
excessively — do not leave the F-20 in your parked car on a
sunny day!
Before connecting/disconnecting cables or turning the unit on/off, be
sure to set the VOLUME/MASTER VOL. control on the F-20 to 0.
Keep the F-20 away from neon signs or fluorescent lighting to prevent
noise pickup.
Precautions
Rated Output Power : 20 W
Speaker : 20 cm x 1
Controls : VOLUME, GAIN, MASTER VOL., TREBLE, MIDDLE, BASS,
CH SELECT switch (A/B)
Input/Output Terminals : INPUT, AUX IN, PHONES
Control PanelSpecifications
qINPUT : Connect your guitar to this jack.
wCH SELECT A/B (Channel Select Switch A/B) : Depress
the switch (>) to select Channel B which, can be used to create
distortion. When the switch is in its raised position (?), Channel A is
selected producing a clean, distortion free tone.
A Channel
eVOLUME : This knob controls the volume level of Channel A. This
knob functions only when Channel A is selected (?) with the CH
SELECT switch (the Channel A LED will light).
B Channel
rGAIN : This knob is used to control the amount of distortion. Rotate
the knob to the right to increase distortion. This knob functions only
when Channel B is selected (>) with the CH SELECT switch (the
Channel B LED will light).
tMASTER VOL. : This knob is used to control the volume level of
Channel B. This knob functions only when Channel B is selected (>)
with the CH SELECT switch (the Channel B LED will light).
Handle the unit carefully — never apply excessive force to the
controls and avoid dropping the unit.
For safety, always remove the power plug from the AC wall outlet if
there is any danger of lightning striking in your area.
To prevent damage and possibly electrical shock, never open the
case and tamper with the internal circuitry.
Never use solvents such as benzene or thinner to clean the F-20.
Wipe clean with a soft, dry cloth.
Tone Controls
yTREBLE : This knob controls the level of the amplifier’s high fre-
quencies.
uMIDDLE : This knob controls the level of the amplifier’s mid fre-
quencies.
iBASS : This knob controls the level of the amplifier’s low frequen-
cies.
oAUX IN : Connect the output of an external audio device such as a
CD, MD, cassette deck, etc, to this jack to listen to audio playback of
the device, along with your guitar, through the F-20 amplifier.
* Use the volume control on the audio device to control its volume level.
!0 PHONES : Connect a pair of headphones to this jack.
* The speaker will produce no sound when a pair of headphones is con-
nected to this jack.
!1 POWER : This is the amplifier’s power switch. When the switch is
ON, the LED lamp of the channel currently selected with the CH SE-
LECT switch will light.
Power Requirements : U.S. and Canadian models : 120V, 60Hz
General model : 230V, 50Hz
Dimensions (W x H x D) : 357 x 330 x 197 mm (14.1" x 13" x 7.8")
Weight : 6.5 kg (14 lbs 5 oz)

GUITAR AMPLIFIER

Owner’s Manual

* Specifications and external appearance are subject to change without notice.

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