Tuner Socket (7 Band); Pre Shape Switch; Valve Switch (12 Band); Drive Rotary Control (12 Band) - TRACE ELLIOT AH1000-12 Guide D'utilisation

If an active bass is being used with the HI / LO switch set to LO and the INPUT GAIN control is
turned fully clockwise without the red LED lighting at all, then switch to HI and follow the same
procedure. This is because not all active basses have high enough outputs to require the LO setting
to be used.
While making adjustments to the rest of the controls keep an eye on the level indication LEDs.
Some extreme settings of the graphic equalizer will increase the signal level into clip. If this
happens simply readjust the INPUT GAIN control as mentioned above.

(5) TUNER socket (7 Band)

This is an output for connecting to a tuner. It is a buffered version of the input signal. Simply
connect a 1/4" jack lead from this to a tuner and you will be able to tune up easily at any time
without degradation to the tone. The signal from this socket is present all at times regardless of any
other settings including MUTE.

(6) PRE SHAPE switch

This activates the circuit for the classic Trace Elliot 'Mid Pre-Shape' that all users of previous Trace
Elliot graphic style amplifiers will recognise immediately. As it is our 'signature sound', these
amplifiers are designed to default to this setting when initially turned on. When this is activated the
yellow LED is lit.
The actual effect of this circuit is to boost the low and high frequencies (55Hz and 2kHz to 5kHz
respectively) and to cut the mid frequencies (centred around 400Hz), giving an instant, clearly
defined, punchy sound. It can be switched on and off using the front panel switch and also from the
footcontroller. Both have a yellow LED to show its status.

(7) VALVE switch (12 Band)

This switches the VALVE circuit on or off.

(8) DRIVE rotary control (12 Band)

This sets the signal level that is sent into the VALVE circuit.

(9) BLEND rotary control (12 Band)

This controls the mix between the normal sound and the sound from the valve.
The VALVE section uses both halves of an ECC83/12AX7 thermionic valve and is configured to be
in parallel with the normal signal.
Low settings of the DRIVE control will remain basically clean but with valve warmth added due to
the harmonics generated by the valve. Higher settings will drive the valve harder and will result in
overdrive sounds being created.
The BLEND control can then be used to literally blend together the two parallel signals to achieve
the desired effect. With the BLEND control fully anti-clockwise only the normal signal will be
present; turning clockwise will reduce the normal signal and increase the valve sound until, with the
control fully clockwise, only the valve sound is present. This means that in all positions, other than
maximum and minimum, the sound of the valve is blended together with the normal, clean signal
which prevents the bottom end losing definition.
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