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12 | 11 | 10 | 9 | 8 | 7 | 6 |
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6 | 7 | 8 | 9 | 10 | 11 | 12 | |||||||||
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5 | 4 | 3 | 2 | 1 |
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
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,
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.
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
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.
4
Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS !
* 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
* EUROPE ONLY - Note: The Peak Inrush current for the 1923 and 1923C is 33 amps. 5
