True to the Music
TWIN-CITY AB/Y
OWNER’S MANUAL
Radial Engineering Ltd.
Part # R800 7115
Bones Twin-City AB/Y
FEATURES AND FUNCTIONS
1.
IN
: 1/4" input jack for your guitar.
2.
DRAG
™
: Reintroduces the natural loading that occurs
between your ampli
fi
er and the guitars pickups. Start
with DRAG set to 12 o’clock. Use your guitar pick like
a screwdriver to move the control until it sounds right to you.
3.
OUT-A
: 1/4” jack connects to amp-A. For safe operation always connect
to a properly grounded guitar amp equipped with a 3-prong A/C power
cord. See the warning on the other side of this manual.
4.
OUT-B
: 1/4” jack connects to amp-B. This output is transformer isolated
to eliminate hum and buzz caused by ground loops.
5.
PSU
: Connection for 9-12 volt DC (center pin negative
).
6.
A/B STATUS LED
: Two LED status indicators display the active amp while
in single output mode.
7.
TOGGLE
: Footswitch selects between amp-A or amp-B while operating
in single-amp mode.
8.
BOTH
: Footswitch activates both amps. An LED status indicator illuminates
when dual-amp mode is active.
9.
LIFT
: Disconnects ground at OUT-B to further reduce noise.
10.
180°:
Polarity reverse switch inverts the signal phase of OUT-B to ensure
amps are in-phase and their speakers are moving in the same direction.
CONGRATULATIONS
on your purchase of the Bones Twin-City AB/Y amp
switcher. The Twin-City is an active switcher that enables you to connect two
amps and switch between them or drive them both simultaneously without
degrading your natural guitar tone in any way. In our view, changing the tone
of a ’57 Strat is not an option!
The Twin-City buffer lowers the output impedance and susceptibility to in-
terference allowing you to drive long cables without tone loss or noise. Drag
Control™ is a recessed “set-and-forget” control that lets you compensate
for cable signal loss and introduce the perfect load to replicate the way
your guitar’s pickups naturally interact with your amp. Advanced Electronic
Impulse Switching (EIS) is 100% noiseless and free from popping noises
produced by mechanical switches.
To eliminate ground loops that cause hum and buzz the Twin-City is
equipped with an isolation transformer on OUT-B. This output is further
augmented with a ground lift switch and 180º polarity reverse switch that
ensures both ampli
fi
ers play in phase while noise is reduced to an absolute
minimum even when using older amps that are prone to noise.
Bright, easy to see LEDs deliver on-stage switching cues so you know ex-
actly what your amp status is at all times. The Twin-City is a powerful ABY
switcher that delivers all of the natural tone, punch and clarity without the
inducing noise of any kind.
POWERING THE TWIN-CITY
Bones pedals require an external power adapter that outputs 9 to 12 volts
DC with a 2.1mm barrel jack wired center pin negative
. Bones
pedals will draw a max of 100mA. Possible damage may occur if another
type of power adapter is used. Consult your dealer for more information.
CONNECTIONS AND SETUP
Before you begin, turn your guitar ampli
fi
ers OFF. Connect the power supply
adaptor. An LED illuminates indicating the pedal is powered up and ready
for use.
Connect your guitar to the IN jack.
Connect OUT-A to your “A” ampli
fi
er.
Connect OUT-B to your “B” ampli
fi
er.
Always test your connections with your amps
set at a low volume level. Turn your amps on.
If no sound is heard check the guitar and
power connections.
Activate amp-A by depressing the TOGGLE
footswitch (LED A on). Adjust your amp to a
comfortable volume for playing. Depress the
TOGGLE footswitch again and set up amp-B.
Next, perform a polarity test to ensure the
loudspeakers in both amps are moving in the
same direction. With both amps active and set
to equal volume
fl
ip the 180° switch to adjust
the polarity of OUT-B. Listen to the sound at
both positions and choose the one that sounds
the fullest.
Finally, if you notice hum or buzz, try lifting the ground by sliding the LIFT
switch. Use the position that produces the least noise and your ready to rock.
2
4
3
1
7
8
5
6
9
10
TM
