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ENGLISH
54
Footswitch
1. Channel
By connecting the supplied PEDL10001
footswitch to this jack it is possible to switch
between Channel A and Channel B. The
footswitch will override the front panel Channel
switch position (item 15).
2. Reverb Footswitch
By connecting another PEDL10001 footswitch
(optional) to this jack it is possible to remotely
switch reverb on and off.
Effects Loop
3. Send
For connection to the input of an external effects
processor.
4. Return
For connection from the output of an external
effects processor.
5. Loop Level
The loop level can be adjusted to match either
floor pedals, requiring a low level or effects
processors which require a high level.
Loudspeaker Outputs
With all valve amplifiers it is imperative that the
amp is connected to a load whilst in operation
and that the impedance selected on the amp
matches the total impedance of the speaker
cabinet(s) being used.
Failure to comply with these points will result in
damage to the amplifier.
The three outputs, a dedicated 16 Ohm output
and two outputs selectable between 4 and 8
Ohms.
The amp should not be run into an impedance
less than 4 Ohms.
6. 16 Ohm Output
For the connection of a 16 Ohm speaker
cabinet. It should be noted that when this
Speaker Output is in use the remaining Speaker
Outputs, items 7 and 8, will become
inoperational.
7 & 8. 4 & 8 Ohm Outputs
For use when the total impedance of speaker
cabinets used is either 4 or 8 Ohms. That is,
when using either a single 4 Ohm cab, a single
8 Ohm, two 8 Ohm cabs or two 16 Ohm cabs.
9. Impedance Selector
Allows selection of 4 or 8 Ohms impedance for
items 7 & 8. See Loading Points.
10. H.T. fuse
See rear panel for correct value.
11. Mains Input
Your amp is provided with a detachable mains
(power) lead which is connected here. The
specific mains input voltage rating that your
amplifier has been built for is shown on the back
panel. Before connecting for the first time,
please ensure that your amplifier is compatible
with your electricity supply. If you have any
doubt, please get advice from a qualified
person. Your Marshall dealer will help in this
respect.
12. Mains fuse
See rear panel for correct value.
Loading Points
One 4 Ohm cabinet, set to 4 Ohms
One 8 Ohm cabinet, set to 8 Ohms
Two 8 Ohm cabinets, set to 4 Ohms
Two 16 Ohm cabinets, set to 8 Ohms
N.B. Always ensure that proper speaker leads
are used to connect speakers, not guitar leads!
WARNING!
If loudspeaker is disconnected a high voltage
can be present at these output terminals.
Operation in this manner can damage your
amplifier, therefore ensure that loudspeaker is
properly connected.
Your amp should be completely powered down
before changing loads.
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12 11 10 9 8 7 6 5 4 3 2 1
2 3 4 5 6 7 8 9 10
11
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* EUROPE ONLY - Note: This equipment has been tested and found to comply with the
requirements of the EMC Directive (Environments E1, E2 and E3 EN 55103-1/2) and the Low Voltage
Directive in the E.U.
* EUROPE ONLY - Note: The Peak Inrush current for the 1923 and 1923C is 33 amps.
Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS !
4


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