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U-RETRO 4 KNOB DELUXE & FLAT RESPONSE VERSION Displayed For REFERENCE ONLY (Replaced by UNI-PRE 4 KNOB)

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Quick Overview

The U-RETRO 4 KNOB DELUXE with three stacked knobs and one single, allows a full Passive mode, with Volume/Blend plus Passive Tone. When set to Active, addional controls and functions include a 3 band equaliser with bass, variable frequency mid, treble and bright function. The Passive Tone operates in both Active and Passive. There are two versions, the original with a slight low and high end pre-shaper built in, and by consistent requests, a flat response unit.


Information Sheet


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U-RETRO 4 KNOB DELUXE & FLAT RESPONSE VERSION Displayed For REFERENCE ONLY (Replaced by UNI-PRE 4 KNOB)

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Details

The U-RETRO 4 KNOB DELUXE with three stacked knobs and one single, allows a full Passive mode, with Volume/Blend plus Passive Tone. When set to Active, addional controls and functions include a 3 band equaliser with bass, variable frequency mid, treble and bright function. The Passive Tone operates in both Active and Passive. 

There are two versions, the original with a slight low and high end pre-shaper built in, and by consistent requests, a flat response unit, where when the controls are set in their most neutral setting, there will be no coloration, or difference in response, when switching between active and passive. The pre-shape unit gives a slight lift and fatness when switched in, whereas the flat response type retains the original sound, except that the pickups are buffered by the preamplifier.

The pot threads are 10mm long, designed to allow rear cavity mounting in the bass body.

The passive tone pot has a push/pull function which switches between active and passive paths:

PASSIVE (Pull Tone Knob)  Signals from the pickups pass through the passive blend, passive tone and then on through the passive volume control section, which feeds the jack.

ACTIVE (Push Tone Knob)  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.

The pots have 10.0mm threaded bushes designed for rear cavity mounting in the bass. Flat wire connections to the pots and toggle switches allow for flexible layout. 
 
The preamp comes fully wired including battery clip and Switchcraft jack. For ease of installation, pickups are connected via screw terminals.  A ground wire will need to be connected to grounding points such as the bridge and any internal screening.
 
Out of the box, just connect the pickups using the screw terminals. snap on a battery, and you'll get sound.

HARDWARE OPTIONS: Chrome, Black or Gold. (Can be mixed by special request)

What they say!

 *  Hello John, I had a gig last night and the bass with your preamp was a true joy to play. Very difficult venue, hollow stage but with sweepable mids it was very, very easy to find the right range and cut through like a knife. I can't even remember how many preamps I tried over the years but yours is in a class of its own. Best regards.  Dejan - Canada 

*  Anyway, I just wanted to thank you for your earlier email and instructions about the jack. I have to say WOW! It's made such a massive difference to the bass. Even in passive mode the tones I can achieve are far superior to what I had before, and the variety of tones in active mode is awesome. Thanks for all your assistance, and for providing such an excellent product :)  Oli - UK

*  After some detailed research, I called John in August 2010 to discuss my preamp requirements for my custom build bass. John was very patient and helpful, and recommended his new U-Retro Deluxe 4-Knob. The flawless design and very clear instructions made it very simple to install, with the result that my bass sounds amazing and has a fantastic range of tones to suit any situation, live or in the studio. I'm delighted! Nigel - UK


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