U-RETRO 5 KNOB DELUXE
The U-RETRO 01 5 KNOB DELUXE, based on the J-RETRO 01, is a universal highly flexible
on-board preamp and EQ system. The standard pots have 10.0mm threaded bushes to allow
rear mounting in the wood of a bass body. Flat wire connections to the pots allow for flexible
layout.
Its high quality circuit uses three single knobs and two dual concentric knob stacks. It
includes a passive blend plus a 3 band equaliser with bass, variable frequency mid, treble
and bright function. A passive tone circuit is also included which operates in both active and
passivemodes.
The passive tone pot has a push/pull function which switches between active and passive
paths:
(Single Knob)
(Single Knob)
(Stack Knob)
ACTIVE Signals from the pickups pass through the passive blend, passive tone, into the preamp input
stage. Then through the equaliser and volume section within the active circuitry, and on through a low
impedance output stage to the jack.
PASSIVE Signals from the pickups pass through the passive blend, passive tone and then on through the
passive volume control section which feeds the jack.
The Volume has two sections under the same knob. A high impedance section is used for the passive path
and a separate additional section is utilised in setting the volume for the active path.
When used active, this knob has active circuitry after it so that the feed to your amplifier is a low
impedance drive. A 0-12dB preset allows gain adjustment for the input stage of the preamp.
The Blend knob, fully operational in both active and passive modes, sets the balance between the
pickups. This is a very conventional control type, used in many different types of basses. Turn it fully
clockwise for the neck pickup alone, and fully anti-clockwise for the bridge pickup. The midway position,
which has an indent, gives an equalmixofbothpickups.
The upper knob is the Treble control with boost and cut. The central 'flat' position is indented. The cut
settings work on lower frequencies compared to boost to give a deeper sound when the top is rolled off.
Pull the Treble knob for the Bright setting.
The lower outer knob is the boost only Bass control. The frequency band of boost gets progressively
lower as the boost is increased. An indent midway is included to aid the setting of this control.
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VOLUME
BLEND
BASS & TREBLE
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TREBLE (+12dB @ 3 kHz, -12dB @ 1kHz)
BRIGHT (+8dB @ 7kHz)
BASS (+15dB @ 50Hz)
Continued over:
Active/Passive Preamp for Bass Guitars
Summary of Contents for U-RETRO 5 KNOB DELUXE
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