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LEHLE GmbH · Germany · www.lehle.com · [email protected]
output of a multi power supply offering
galvanically isolated outputs for the LEH-
LE SUNDAY DRIVER SW II.
6. LED
If the LED is showing blue, the gain con-
troller and S/D-selector switch are active.
The high-intensity LEDs under the lenses
clearly indicate the switching-state, even
under stage lighting.
If the LED is showing white, the LEHLE
SUNDAY DRIVER SW II is in bypass and
depending on the position of the TS/TB-
selector switch (3) in “True-Bypass” or
“True Sound”.
7. GAIN CONTROLLER
Use the gain controller to adjust the in-
tensity of the preamp from a slight 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 depres-
sion, and thanks to the recessed design,
your setting cannot be inadvertently dis-
turbed on stage or during transportation.
The LEHLE SUNDAY DRIVER SW II with its
discrete Class A JFET circuitry performs
two functions simultaneously - reducing
signal impedance on the one hand, and
boosting the signal on the other.
THE LEHLE SUNDAY DRIVER SW II 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 imped-
ance converter.
With the knob in this position, you can
compensate for sound losses that can oc-
cur when long cables or multiple effects
are used.
THE LEHLE SUNDAY DRIVER SW II 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. Since the frequency response of
tubes especially are not linear, the LEHLE
SUNDAY DRIVER SW II ensures that the
resultant overdrive distortion sounds har-
monious and amplifies less treble in ”S”
mode as the “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 between the orig-
inal and the boosted signal.
The LEHLE SUNDAY DRIVER SW II
switches all audio signals controlled by
a microcontroller and an intelligent True-