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Vintage Overdrive
Switch to the Boost channel which is indicated by the Red L.E.D. Again pickups
will obviously influence settings but you will probably find that gain settings of
around 5 or 6 are quite adequate, the key however is to increase the master volume
level. As our vintage amps didn't really have a lot of pre-amp gain guitarists used
to crank the volume up to be heard which resulted in the natural classic Marshall
overdrive roar. Alternatively the Normal Channel with its volume on maximum
gives a very satisfying vintage type overdrive.
As far as tone settings go we would suggest that you start with the tone controls
set at about 5 and then adjust to taste from there. The selection of tone settings for
single coil or humbucking pickups will follow the same general pattern as for the
clean sound.
Modern Hi-Gain
Switch to the Boost channel indicated by the Red L.E.D.
Turn the gain up to full and set the volume for the desired level. Tone controls are
set to taste, though probably with the Middle control lower than the Bass and
Treble controls particularly to maintain the definition when using humbucking
pickups.
The best advice we could really offer is to simply experiment and above all enjoy
the pure valve tone of your Marshall JTM amplifier.
JTM 30 Front Panel Functions.
1) Footswitch Jack
Jack socket for connection of P801 Footpedal for channel switching.
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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) L.E.D.
Indicates channel. Green-Normal Red-Boost.
6) Gain Control
Controls the amount of Gain on the Boost
channel.
7) Volume Control
Controls the volume of the Boost channel.
8) Bass Control
Dictates the amount of low frequency or bottom
end in the overall tone.
9) Middle Control
Controls the middle frequencies and fatness of
the overall tone.
10) Treble Control
Controls the upper or treble frequencies in your
tone.
Please Note
The Tone Controls are interactive and adjusting
one can affect 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.
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