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INPUT
V
Hz 325W
TYPE: PR 903
POWER
ON
OFF
POWER
STANDBY
M.
POWER — Switches the unit on-off.
♫
You can extend the life of the amplifier tubes by keeping the STANDBY
{N} switch down for 60 seconds when you first switch on the power.
N.
STANDBY — In standby, the amplifier outputs are disabled while
power is supplied to the tube filaments only, keeping them warm and
ready to play.
♫
Use STANDBY instead of switching the power off during short breaks
to extend tube life span and to avoid the tube warm-up delay upon
returning to play the amp.
O.
IEC POWER INPUT SOCKET — Connect to a grounded outlet using the
supplied power cord in accordance with the voltage and frequency
specifications shown on the rear panel of your amplifier.
P.
FUSE — Protects the amplifier from electrical faults. Only replace a
blown fuse with the type and rating specified on the rear panel of
your amplifier.
Q.
ARENA / CLUB — Select ARENA for maximum power output (100W)
when playing larger venues. Select CLUB for lower power output (25W)
when playing smaller venues or recording.
It is recommended that you change the position of the ARENA/CLUB
!
switch only when the amplifier is OFF or in STANDBY to reduce stress
on the tubes and to extend tube life span.
R.
SEND LEVEL — Adjusts the output level of the SEND {S} jack. Use to
accommodate the input sensitivity of your external effects device.
S.
SEND / RETURN — These effects loop jacks have been tested and
found compatible with instrument-level stomp boxes and line-level
effects processors. Connect SEND to your effects device input and
RETURN to the effects output.
To set the Effect Loop "Unity Gain Level" (so the effects loop volume
level equals the volume with the effects loop disabled):
1.
Start with the SEND LEVEL {R} at maximum and the RETURN LEVEL {T} at
minimum.
2.
If any distortion is noted with the effects processor, reduce the SEND
LEVEL (and/or the processor's input level control) until the distortion is
no longer present).
3.
Then increase the RETURN LEVEL (and/or the processor's output level
control) so the effects loop output is at unity gain (or to your preference).
♫
The Effects Loop button on the footswitch can be configured as a
switchable lead volume boost without effects by simply connecting
SEND to RETURN with an instrument cable. The effects loop will
provide an additional 12dB gain when both SEND LEVEL {R} and
RETURN LEVEL {T} are set to maximum. Lower the RETURN LEVEL for
less boost if preferred.
T.
RETURN LEVEL — Adjusts the RETURN {S} jack input level going into
the power amp. Use to match the volume level of the amp when
effects are off, or to set an alternate volume level selectable from the
footswitch.
All manuals and user guides at all-guides.com
FUSE
ARENA
4A L
250V
SEND
RETURN
MIN
MAX
CLUB
SEND LEVEL
fender.com
Rear Panel
Rear Panel
PRE AMP
POWER AMP
OUT
IN
MIN
MAX
RETURN LEVEL
FOOT SWITCH
U.
PRE AMP OUT — An unbalanced, line-level output (includes Reverb).
V.
POWER AMP IN — A direct input to the power amplifier. The preamp
circuit is automatically disconnected when a plug is inserted into this
jack.
W.
FOOTSWITCH — Connect the included 4-button footswitch to enable
remote selection of: Amp Voicing {C}, Channel {F}, Reverb and FX
Loop Bypass. NOTE: The front panel push buttons are disabled when the
footswitch is connected.
X.
AUTOMATIC BIAS — Select the desired tube bias temperature
(WARM/NORMAL/COOL) using the up and down arrows, after the
amplifier has warmed up (at least one minute). The amplifier will
remember your last setting the next time you switch the unit on.
NOTE: Press the up and down arrows simultaneously for one second to
restore factory automatic bias settings.
The OUTPUT TUBE STATUS indicator LEDs will display the following
information depending on the status of each tube:
LEDs scan left
to right:
LED
is
solid
green:
LED is blinking
green:
LED is red:
LED is orange:
Y.
DAMPING CONTROL — Use to select a "looser" or "tighter" response
from the speakers. Damping is the interaction of the tube power amp
with the speakers.
Z.
IMPEDANCE SELECTOR — Select the speaker output impedance that
matches the total impedance load of the speaker configuration you
have chosen from the table below {AA}.
AA. MAIN SPEAKER / EXTERNAL SPEAKER —
A speaker must ALWAYS be connected to the MAIN SPEAKER jack
!
when the amplifier is ON or damage may occur to the unit. Switch the
amplifier OFF or to STANDBY while changing speaker connections or
impedance settings.
Connect speaker enclosures and set the IMPEDANCE SELECTOR {Z}
according to the table below.
MAIN
SPEAKER
16Ω
16Ω
8Ω
8Ω
4Ω
SERIAL NUMBER
NORMAL
LOOSE
TIGHT
AUTOMATIC BIAS
WARM
ADJUST
NORMAL
2A 1A 1B 2B
4Ω
8Ω 16Ω
COOL
OUTPUT TUBE STATUS
PATENT PENDING
DAMPING CONTROL
IMPEDANCE
The amplifier is warming up (takes approximately 1
minute).
The tube is OK and the bias matches the selected bias
temperature (WARM/NORMAL/COOL).
The tube bias does not match the selected bias temper-
ature. This may happen for individual tubes from time
to time while the automatic bias system is adjusting the
bias. It usually will take less than 20 seconds to reach to
the target bias and for the LED to go back to solid green.
If the LED continues to blink after 5 minutes, its bias set-
ting is beyond the range of the automatic bias and this
tube should be replaced.
The tube has failed or is missing.
The tube has shutdown. A tube may shutdown when the
other tube in the pair (1A/1B) or (2A/2B) is bad or missing.
EXTERNAL
IMPEDANCE
SPEAKER
SELECTOR
+
None
=
+
16Ω
=
+
None
=
+
8Ω
=
+
None
=
PARALLEL SPEAKER OUTPUTS
4Ω min TOTAL
100W
MAIN
EXTERNAL
SPEAKER
SPEAKER
16Ω
8Ω
8Ω
4Ω
4Ω
7
7
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