4
10) Treble Control
Controls the upper or treble frequencies in
your tone.
Note:
The Tone Controls are interactive
and adjusting one can effect the
relative amounts of the others.
Experimentation is the best way of
finding your own personal
favourites.
11) Effects Send Jack
Jack socket for connection to the input of an
external effects processor.
12) Effects Return Jack
Jack socket for the connection from the
output of an external effects processor.
13) Reverb Control
Controls the amount of Reverb on both
channels.
14) Volume
Controls the master or overall volume of the
JTM 30.
15) Standby Switch
Controls the H.T. supply to the valves and
allows the valves to remain heated when not
in use.
16) Power Switch
On/Off switch for mains power to the
amplifier.
Note:
To prolong the life of the valves it
is always advisable to switch on
the Mains Power Switch (item 16)
about 2 minutes before switching
on the Standby (item 15).
This allows the valves to heat up to
full working temperature before
use. On switching off, the Standby
should always be switched before
the Power Switch.
Rear Panel Functions.
1) Mains Fuse
Protects the amplifier and mains supply in
the event of a fault.
2) Mains Input
Connects the amplifier to the mains power
supply.
3) Emulated Output
The Emulated Output captures the tonality
of Vintage loudspeakers like no other D.I.
output. Furthermore this output is
unaffected by the Master Volume control,
therefore allowing the JTM 30’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
fed into either (a) a line level balanced input,
(b) a line level unbalanced input or (c) a low
level unbalanced.
✪
Please refer to the following
JTM 30 XLR Out diagram
(Page 6-7) for correct connections.
4) Internal Speaker Output Jack
For connection to internal 16 Ohm speaker.
5) External Speaker Output Jack
For connection to an external 16Ohm
speaker only (such as the Marshall JTM
112C 1x 12” extension cabinet).
Note:
The JTM 30 will deliver 30 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.
