442801

Marshall MA Series Manual

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76
22. Speaker Output Jack Sockets x 2
These two jacks are tapped from the 8Ω winding of the
output transformer and are wired in parallel. The required
total load impedance of 8Ω will be realised with either of
the following configurations;
One 8Ω cabinet plugged into one of the 8Ω outputs.
Two 16Ω cabinets plugged into each of the 8Ω outputs.*
Note: The cable from the internal speakers of the
MA100C combo should be plugged into either one of
these sockets. If using an extension cab, then the internal
speakers must be disconnected, otherwise the total
impedance will be too low for the amp!
* 16Ω and 16Ω in parallel gives a total impedance of 8Ω.
23. Speaker Output Jack Socket
This jack is tapped from the 16Ω winding on the output
transformer. When using a single 16Ω cabinet it should be
plugged into this socket.
Note: The cable from the internal speaker of the MA50C
combo should be plugged into this socket. If you want to
use the internal speakers and an extension cab then the
internal speaker lead must be transferred to one of the
8 Ohm outputs and the extension cab itself must be
16 Ohms and plugged into the other 8 Ohm output. If the
internal speakers are not required then simply ensure the
impedance of the extension cab is matched to the amp.
WARNING! Do not use the 8Ω outputs when using the
16Ω output (and vice versa) and never operate the
amplifier without a load connected.
ALWAYS ensure you use good quality speaker
(unshielded) cables. NEVER use guitar (shielded) cables.
24. Footswitch Socket
This is where the supplied two-way footswitch
(PEDL-91001) is connected. Ensure that the front panel
push buttons on the amp are in the OUT position when
using the footswitch.
Footswitch information:
The two-way footswitch allows for remote selection of
channels and enabling of the boost function, particularly
useful in live performance.
The left button controls the channel selection and is
labelled ‘Clean / OD’. Above this switch the associated
red LED will be off when the Clean channel is selected
and on when the Overdrive channel is selected.
The right button enables the boost function for the
Overdrive channel. This can be preset to ‘on’ even while
playing in the Clean channel, so when you change to
Overdrive it’s automatically in boosted mode if you so
desire. Above this switch the associated red LED will be
off when the Boost is disengaged and on when the Boost
is selected.
Effects Loop Send & Return Jacks:
To increase the flexibility of your amplifier even further,
you may choose to add external effects in its Series
Effects Loop. Nominal level is -10dBV.
25. External FX (Bypass/Loop)
When ‘out’, this switch will cause the FX Loop Return
input to ignore any signal from connected external FX,
however, the Send output is always active. Push this
switch ‘in’ to enable the loop.
Note:
If this switch is accidentally pushed ‘in’ and there
is nothing plugged in to the loop, the signal will still pass
through from send to return by means of an internal link
on the switching jacks. This link is disconnected when
something is plugged into the return socket. The send
socket has no effect on the status of the internal link and
therefore can be used as a line out to a tuner or the return
of a second amp for example.
26. Return
Connect the (mono) output of an external effects
processor here.
27. Send
Connect the (mono) input of an external effects processor
here.
Generally, effects involving distortion or Wah Wah aren’t
usually put in an effects loop because they sound ‘best’
when they’re before the amp (i.e. placed between the
guitar and the amp’s input). However, when it comes to
your sound, it’s up to you!
28. Mains Input Socket with incorporated
Mains Fuse
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 manufactured
for is indicated on the rear panel. Before connecting for
the first time, please ensure that your amplifier is
compatible with your electricity supply. If you have any
doubt, please seek advice from a qualified technician.
Your Marshall dealer will help you in this respect.
MA100H MA50H
Power (RMS) 100W 50W
Valves 3 x ECC83 + 4 x EL34 3 x ECC83 + 2 x EL34
Channels 2 2
Dimensions (mm) W, H, D 750 x 310 x 250 750 x 310 x 250
Weight (kg) 18.4 16.4
MA Series Technical Specification
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 MA100H & MA100C is 27 amps.
The Peak Inrush current for the MA50H & MA50C is 20 amps.
MA100C MA50C
Power (RMS) 100W 50W
Valves 3 x ECC83 + 4 x EL34 3 x ECC83 + 2 x EL34
Channels 2 2
Speaker Configuration 2 x 12" 1 x 12"
Dimensions (mm) W, H, D 680 x 510 x 265 635 x 510 x 270
Weight (kg) 28.4 22.7
MA Series Rear Panel Features
ENGLISH
22 23 24 25 26 27 28
Rear panel shows MA100H –all other MA Series Head and Combo rear panels share the same features
The correct value of mains fuse located in the small drawer at the bottom of the mains socket is specified on the rear
panel of the amplifier. The drawer contains a space for a spare fuse. NEVER attempt to bypass the fuse or fit one of the
incorrect value.
Note: It is wise to carry spare fuses at all times.
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