Owner`s manual
TWEAKER-40 HEAD
1) AC INLET and FUSE: Connect a uni-
versal IEC type power cord. Be sure the
proper value fuse is installed that matches
the ratings as indicated for your country on
the rear panel.
2) AC VOLTAGE SELECTOR: Makes
the Tweaker-40 compatible with the line
voltage in any country. Proper setting of
this switch is absolutely critical. Be sure
the switch position matches the line voltage
in your country. Severe damage will result
from improperly setting this switch and
will void your warranty, as well as destroy
your amp. To change the setting, loosen
securing the plastic safety cover strip over
the switch. Swing the cover aside. Using a
small screwdriver, slide the switch to the
proper setting. Replace the cover and
retighten the screws. Be sure to install the
proper value fuse.
3) TUBE FUSE: This fuse is directly con-
nected to the power tubes high
voltage supply. In the unlikely event of
a power tube failure/short, this fuse will
open. If this happens, it is a sure indication
of a defective power tube.
4) FOOTSWITCH: The Tweaker-40
footswitch has four pushbuttons for control
of channel switching, the effects loop and
the individual BOOSTS for each channel.
The cable splits into two ¼” plugs at the
to match the jacks on the amp.
5) EXTENSION SPEAKER OUTPUT:
Used to connect a second speaker cabinet.
Since the MAIN speaker output is labeled
USE FIRST, it would reasonable to
assume this jack could be labeled USE
SECOND, which would be correct. See
the section later in this manual for proper
connection and IMPEDANCE SWITCH
settings for different speaker arrangements.
6) MAIN SPEAKER OUTPUT: Labeled
“USE FIRST” because you must use this
jack….FIRST. There is a special circuit
inside the Tweaker-40 that helps
you forget to plug in the speakers and at-
tempt to play. As we all know, you NEVER
speaker load connected…but we didn’t
have to tell you that, did we ?
7) IMPEDANCE SELECTOR
SWITCH: Set this switch to match the
IMPEDANCE of your speakers.
8) EFFECTS LOOP: Basically a series
insert patch point between the preamp
and power amp. When an external effects
gadget is patched into these jacks, the path
is interrupted and 100% of your signal is
routed through the effects. This puts some
special demands on the effects unit. First,
the effects unit must be essentially trans-
parent, meaning it can’t mess with your
tone. Second, the input and output levels
lowest noise and maximum headroom.
Proper setting of these controls can be
achieved using the following method:
a) Set your amp/preamp volume levels
for normal playing levels. Connect a
50/60Hz 300 WATTS
10
REAR PANEL