Lehle Sunday Driver SW, Operating Instructions Manual, Page: 9 / 20

7
shows red. No LED illuminates during Bypass
mode, so your batteries will last longer.
7. 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 SW
with its JFET-based circuitry performs two functions
simultaneously, reducing signal impedance, on the
one hand, and boosting the signal, on the other.
The Lehle Sunday Driver SW 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 balance out sound losses that can occur when
long cables or effects cascades are used.
The Lehle Sunday Driver SW 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
SW 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.
8. True Bypass switch

Use this switch to select the original or the signal
with more gain.
This button activates a Bypass switch with gold-
plated contacts inside the
Lehle Sunday Driver
SW , via a virtually indestructible switch mecha-
nism. In OFF status, the Lehle Sunday Driver
SW provides two different modes of operation,
the TB for “True Bypass” and the TS for “True
Sound” mode. In ON state, the LED (6) shows red,