Lehle Sunday Driver, Operating Instructions Manual

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desired, this connector can also be soldered on to
your power-pack mains cable.
The cover must be unscrewed and removed to
permit installation of a 9V (PP3) ”block” battery. To
do this, simply unscrew the four screws holding the
cover, and draw the cover off.
Note: The Lehle Sunday Driver automatically
switches via a gold-plated-contact relay to battery
operation if power supply voltage drops below 9
Volt. So always make sure that the
Lehle Sunday
Driver has a charged battery if you want the extra
security of knowing that it will continue to operate
trouble-free even if the power supply fails.
5. Gain controller


Use the gain controller to adjust the intensity of
the preamp from a slight
”
refresh sound” level up
to a powerful boost.
The gain control knob consists of black anodized
aluminium and is recessed into the housing. It
can be easily turned by placing your fingertip in
the top depression, with the great advantage that,
thanks to the recessed design, the setting cannot
be inadvertently disturbed on stage or during
transportation. The
Lehle Sunday Driver with its
JFET-based circuitry performs two functions simul-
taneously, reducing signal impedance, on the one
hand, and boosting the signal, on the other.
The
Lehle Sunday Driver as an impedance
converter:
When the gain controller is at the left-hand stop
(in the ”0” or ”seven o’clock” position), it operates
purely as an impedance converter. With the knob
in this position, the sound is refreshed, in order to
compensate for sound losses that can occur when
long cables or effects cascades are used.
The
Lehle Sunday Driver as a booster:
A buffer starts to amplify the signal when the
gain controller is turned further in the clockwise
direction. Tube amplifiers, preamps and distortion
pedals can thus be driven slightly beyond the limit.
To make sure that the resultant overdrive distortion
sounds harmonious, the
Lehle Sunday Driver
in ”S” mode amplifies less treble as “Boost” rises.
The result can range from a pleasant sound, with
no shrillness, up to a silky warm, harmonious
overdrive distortion on tube amplifiers.
6. Base and fixing

You can use the fixing screws supplied with the
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