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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
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.
JTM 30 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 Note
Please refer to the JTM XLR Out diagram
(Page 6) 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 16 Ohm
speaker only (such as the Marshall JTM C112
1x 12" extension cabinet).
Please 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.
JTM 610, 612, 615,
622 and JTM 600 Head
Front Panel Functions.
60
1) Footswitch Jack
Jack socket for connection of
P801 Footpedal for channel
switching.
2) Push Channel Switch
Push switch for panel switching of the
channel. The push switch is inoperative when
the footswitch is connected.
3) Input Jack
Jack socket for the input of the guitar.
4) Volume Control
Controls the Volume of the Normal channel.
5) Bass Control
Controls the lower frequencies or bottom end
in the tone of the Normal channel.
6) Middle Control
Controls the middle frequencies and fatness
of the tone of the Normal channel.
7) Treble Control
Controls the upper or treble frequencies in the
tone of the Normal channel.
8) L.E.D.
Indicates channel. Green-Normal Red-Boost.
9) Gain Control
Controls the amount of Gain on the Boost
channel.
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