Aclam Guitars Dr.Robert Vox UL730 User Manual & Safety Instructions page 7

BYPASS SWITCH: Engages the unit allowing the
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signal to flow through the Dr. Robert circuit. It also
lights up the LED above it.
VOL: Controls the overall volume of the Dr. Robert
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when you're not using the Mach Schau! section.
GAIN: This control is placed in the same position of
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the circuit as the original UL730's volume control.
Since none of the Vox UL series had a master volume
®
control the user had to turn it all the way up to bring
the amp into saturation, and believe us, this thing is
loud. To solve that we put the Vol control at the end
of the FET section so now, the volume control on the
original amp turns into a gain knob on the Dr. Robert.
At lower settings the Gain knob will produce a clean
tone, but as you approach the 12'o-clock mark the FET
section will start entering the saturation region.
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Have in mind that due to Dr. Robert's great dynamics,
different types of guitars and pickups will affect the
clean range of the Gain knob.
7 MIDS: This is the most critical knob to tailor your
sound. Unlike most equalizer circuits (which get placed
after or before the volume control) Vox separated
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the mids control from the rest of the tone stack in the
UL730. In this preamp the signal gets amplified first,
followed by the Mids control before the volume pot.
After this, Vox placed a special gain stage coupled
®
with the Bass and Treble controls. Thus, you can
control the midrange without interacting with the rest
of the eq, as traditional tone stacks do.
By turning it counterclockwise, it will subtract a great
amount of mid-range, creating a really interesting
scooped sound.
Turning it clockwise will bring mid frequencies and the
overall gain builds up hitting harder the EL84 tubes,
creating saturation.
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MS VOL MIDS
Just like the real amp does, Dr. Robert's "Mids" control has the same behavior thanks to the FET section specially tuned
to mimic the power amp saturation on the UL730.
So, keep in mind, the "Mids" knob will have a great effect on the overall saturation of the unit.
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