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Rear Panel Functions.
1) Mains Fuse
Protects the amplifier and mains supply in
the event of a fault.
Check the label on the back of the amp for
the correct value. Always replace fuses with
the correct type and rating.
2) Mains Input
Connects the amplifier to the mains power
supply.
3) Parallel FX Loop Return Jack
Jack socket for connection from the output
of an external effects processor.
Note: A parallel FX Loop is best suited for
use with external effects processors which
require a certain amount of dry or uneffected
signal in the overall tone. Time based effects
such as Delay and Chorus are typical
examples of the effects best suited to this
type of Loop.
4) Parallel FX Loop Send Jack
Jack socket for connection to the input of an
external effects processor.
5) Series FX Loop Return Jack
Jack socket for connection to the output of
an external effects processor.
6) Series FX Loop Send Jack
Jack socket for connection to the input of an
external effects processor.
Note: The Series Loop is best suited to
effects that require no dry signal such as
Compressors or Graphic Equalisers.
7) Line Out
The JTM60's Line Out is switchable
between a speaker Emulated signal
(pre the power amp), and a non Emulated
(post the power amp ) signal.
The Emulated Output captures the tonality
of Vintage loudspeakers like no other D.I.
furthermore this output is unaffected by the
Master Volume controls therefore allowing
the JTM 60's output to be turned off whilst
still providing silent recording facilities.
The D.I. Output is via an XLR type
connector which allows this system to be run
into either (a) a line level balanced input (b)
a line level unbalanced input or (c) a low
level unbalanced input.
Please refer to the JTM 60 XLR Out
diagrams (Page 6-7) for correct connections.
8) Pre/Post Switch
Allows Line Out selection between a
speaker Emulated signal (pre the power
amp) and non-emulated (post the power
amp).
9) Presence Control
This Master Presence control adjusts the
amount of top end frequencies in the overall
tone adding crispness and bite.
10) Speaker Output Internal
Jack for connection to internal 16 Ohm
speaker.
11) Speaker Output Extension Jack
For connection to an external 16 Ohm
speaker (such as the Marshall JTM 112C
1x12 ).
Note: The JTM 60 will deliver 60 Watts into
either one or two 16 Ohm speakers, ie. 16 or
8 Ohm total impedance. The unit should not
be driven into a load of less than 8 Ohms.
If you unplug the internal loudspeaker it is
possible to connect a single 8 Ohm cabinet
to the extension Speaker Output only.
However, when the internal speaker is
connected only a 16 Ohm extension cabinet
may be used.
It is important to follow these instructions as
failure to do so may lead to the amp running
into the wrong impedance, which will
ultimately cause damage.
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