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1. TREMOLO FOOTSWITCH JACK
This is where the supplied Tremolo on/off
footswitch is plugged in.
2. LOUDSPEAKER OUTPUTS
There are two parallel loudspeaker output jacks
provided for connection to the internal speaker
and/or an external load, i.e. speaker extension
cabinet(s). When connecting speaker(s) please
always ensure that the amplifier’s output
impedance is set correctly (item 3).
WARNING! Never use the combo without a load
attached!
Always use a non-screened Marshall approved
speaker lead when connecting an extension
cabinet to these units.
3. OUTPUT IMPEDANCE SELECTOR
Matches the amplifier’s output to the load (speaker)
impedance.
As is the case with any Marshall all-valve amplifier
it is imperative that: a) the amplifier is connected to
a load whilst in operation and b) the impedance
selected on the amplifier matches the total
impedance of the internal speaker and/or extension
speaker cabinets.
The combo’s internal speaker is 15 Ohms so when
it is being used by itself the Impedance Selector
must be set to 16 Ohms. If an additional 16 Ohm
extension speaker cabinet is used in conjunction
with the internal speaker the Impedance Selector
should be set to 8 Ohms.
WARNING! An extension speaker cabinet with an
impedance of less than 16 Ohms should NOT be
used in conjunction with the internal speaker.
The amp should be completely powered down
before the Output Impedance Selector is turned.
Failure to comply with any of the points raised in
this section will result in damage to the amplifier.
4. MAINS FUSE
The correct value of mains fuse is specified on the
rear panel of the amplifier. NEVER attempt to
bypass the fuse or fit one of the incorrect value.
5. H.T. FUSE
The correct value of H.T. fuse is specified on the
rear panel of the amplifier. NEVER attempt to
bypass the fuse or fit one of the incorrect value.
6. 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 technician. Your Marshall dealer
will help you in this respect.
ENGLISH
3 54 621
1974X Rear Panel
Technical Specification
Power Output 18W RMS
Weight 18.2kg
Size 532mm x 610mm x 225mm
Performance Note: Bridging or ‘jumping’ the two channels
Because both Channels of the 1974X have the same number of gain stages (one) and are therefore in
phase with each other, it is possible to bridge them together (a.k.a. ‘slaving’, ‘jumping’, ‘linking’ or even
‘daisy-chaining’) and use them both at the same time – providing you use the Tremolo Channel as the
primary (the reverse won’t work due to the way Channel 1’s two identical inputs are configured). Doing this
enables you to expand upon the amps tonal possibilities by mixing the two channels together.
The most common way of doing this is to plug your guitar into the top (high sensitivity) input of the Tremolo
Channel and then run a short ‘jumper guitar cable (i.e. a screened cable) from the Tremolo Channel’s
bottom (low sensitivity) input to either one of Channel 1’s two identical inputs.
It is also possible to plug your guitar into the Tremolo Channel’s bottom (low sensitivity) input and then run
the ‘jumper cable from its top (high sensitivity) input to Channel 1. This less common approach can yield
some interesting tonal variations.
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 55103-1/2) and the Low Voltage
Directive in the E.U.
EUROPE ONLY - Note: The Peak Inrush current for the 1974X is 10 amps.
ENGLISH
1974X hbk 21/5/04 3:53 pm Page 6
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