Front Panel Controls - TRACE ELLIOT Bonneville Operating Instructions Manual

FRONT PANEL CONTROLS

Input
1
A single jack socket is provided for connection to your instrument. This is a high impedance input which
allows for perfect matching to both passive and active guitars.
Gain
2
This control adjusts the degree of drive in the preamp stage. This is used in conjunction with the PREAMP
STYLE switch to set the amount of overdrive required.
Preamp Style
3
This is a 3 position rotary switch that radically alters the configuration of the preamp.
Position 1 configures the preamp like the classic American tweed circuit (3 valve stages). This is for clean
to low gain sounds depending on where the GAIN control is set.
Position 2 reconfigures the preamp and adds a 4th valve stage. This provides gain levels and tone similar
to traditional British amplifiers.
Position 3 adds a 5th valve stage, re-biases the existing valves and re-voices the circuit. This produces a
modern high gain rock tone.
In all positions the amplifier is very responsive to the player's dynamics and use of the volume on the
guitar.
Tone Controls
4
The tone controls are all passive and interactive.
The BRIGHT switch adds more high frequencies when selected. It works in the traditional way, therefore as
the gain control is increased the effect is reduced.
MID BOOST fattens up the sound by changing the operating range of the TREBLE control. This is
particularly useful when using single coil pickups, to get a stronger tone.
BASS, MIDDLE and TREBLE all work in the conventional way; being interactive controls you will find that
the TREBLE control has an effect on both the BASS and the MIDDLE when a lot of treble lift is used.
Passive controls were chosen as they provide the best and most natural kind of equalisation for a guitar
signal. The amount of bottom end that these amplifiers provide will depend not only on whereabouts the
BASS control is set, but also where the OUTPUT DAMPING control is set (see below).
PRESENCE works as a tone control in the feedback loop of the power stage. Therefore it controls the
overall brightness of the amplifier. This control is interactive with the OUTPUT DAMPING control, the
further clockwise the OUTPUT DAMPING is set the less effect the PRESENCE control will have (see below).
Effects On/Off
5
This switch selects the effects loop; the connections are on the rear panel. With the switch down (ON) the
effects loop is also selectable by footswitch.
Reverb (combo version)
6
A single control is provided to set the level of reverb. The effect is produced by a three spring reverb tray
in the bottom of the cabinet.
Effects Level (head version)
7
This is basically the return level of the effects loop which is found on the rear panel on the combo
versions. For full explanation see below.
Master I & II
8
4
MASTER I & II control the level of signal sent to the power amp and consequently the overall volume of