RedPlate MagicDust Operations Guide
5
IEC Module
– contains the main power switch, power cord inlet connector and the fuse drawer
which doubles as the voltage selector on export models. To access the fuse(s) use a small flat
blade screwdriver in the notch at the bottom of the power cord inlet connector, the drawer snaps
out in a rearward direction. The MagicDust can accept both the larger (3AG footprint) or smaller
European (5mm X 20mm) fuses. A time delay variety (SLO-BLO) is recommended. A 5 amp fuse s
is recommended for domestic use (110
– 125 VAC) and 2.5 amps should be used for Export use
(220
– 240 VAC). The fuse drawer can be rotated on the export models for voltage selection, make
sure the correct value fuse is located on the same side of the fuse drawer as the desired selection
arrow. Line up the appropriate arrow on the fuse drawer with the arrow on the bottom right of the
module for the proper VAC selection.
Standby Switch
– This switch allows the tubes to warm up before operating the amplifier. Wait
1 minute after power on to move it up to the operate position. For improved tube life and
performance do not leave the amplifier in Standby position for longer than 20 minutes (better to just
leave it in operate mode during performance intermissions).
100 WATT / 17 WATT Switch
– This switch changes the voltage on the power amp input stage
(Phase Inverter tube) so the amplifier breaks up sooner. It is alright to change the selection of this
switch even when the amplifier is in operation. Some versions may have a 100/50 switch instead,
see the OpenRange user Manual for details.
Bias adjustment and bias test point
– Allows external access for bias adjustment (see bias
procedure in the
Maintenance
section).
LINE OUT
– A line level signal jack derived from the speaker output which contains the whole
tone of the amplifier.
Speaker Jacks
– The MAIN and EXT jacks are wired in parallel. The MAIN jack must be used
first because it has a protection device. ALWAYS HAVE A SPEAKER CONNECTED TO AVOID
PERMANENT AMPLIFIER AND OUTPUT TUBE DAMAGE.
Impedance Selector Ω
- Set this to the total impedance of all attached speakers.
SEND and RETURN Jacks
– The send jack connects to the input of an external effects device
and the return jack connects to the output of an external effects device. The return jack interrupts
the signal path so the external effects unit must mix the wet and dry signals.
Footswitch Jack
- This is a standard 180 degree 5 pin DIN jack for footswitch connection. The
pinout is conveniently located on the rear panel for use with automated switcher conversion boxes.
SMOOTH Switch
– Employs local negative feedback in the clean preamp for a hint of
compression. The ½ position is a more extreme setting.
Humbucker / Single coil Switch
– Sets the amount of bass gain in the input stage, useful for
matching the amplifier to the guitar type.
OTHER FEATURES
The MagicDust comes complete with a 3 button footswitch and a footswitch cable. The cable
used is a regular MIDI cable and is readily available in any length at most music stores. If a
replacement cable is needed, make sure all 5 wires are supported.