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For sale Duff Clone 9V Baxandall Style Preamp with 2 band EQ - Mini Version

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$85.00
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(Price includes shipping to continental USA and Canada)

Ever wanted to try that famous 9V preamp circuit in your Spector bass, but you were put off by the high price tag and limited availability? Korean and Czech clones of the circuit can be had on the used market, but they require you to rout out the control cavity of your prized possession. Heck, even the real deal requires that you ream out the pot holes in order to get it to fit.

On top of that, you are stuck with the resistance values of the volume and/or blend controls that were installed in the circuit board when the preamp was manufactured. This is because finding adequately sized replacements of different resistance values is pretty much impossible. This can be a real pain if you ever wanted to swap the pickups in your bass at some later date - particularly if you want to make the switch from active to passive or vice-versa.

Oh and one more thing...standard sized control knobs don't fit on the shafts of the Korean or Czech clones either...time to spend more $$$....

The mini-Duff clone preamp was designed to address all of the issues cited above - and more.

It's just like the full-sized Duff-clone, except it is installed using the existing volume and/or blend pots in your bass and is compatible with active or passive pickups. You can choose how to configure it using standard off-the-shelf potentiometers which are generally cheap and readily available. Since it is also built using standard sized potentiometers, the push on knobs that came with your bass will fit just fine.

Unlike the full-sized Duff-clone, it will fit a wider range of basses that have control cavities smaller than the Euro model basses. The pictures below go in to more detail regarding the measurements so you can check to see if it will fit in your bass.

Price is $85 USD. Price includes shipping to the continental USA and Canada.

I will also ship overseas if the buyer is willing to cover the extra shipping charges.

If you have any questions, feel free to send me a PM.

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Control cavity measurements (in inches) for my mini-Duff clone equipped ReBop-2J:

REBOP control cavity measurements.jpg


Full sized vs Mini Duff Clone 9V Preamp:

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Comments

duff2

Guest
Dec 16, 2007
528
457
Wiring instructions:

Nothing gets soldered to the board - connections to the volume/blend pots, pickup power supply (if required) and the output jack are made using the supplied plug connectors (shown in pic #1 in the opening post of this thread).

Connector #1 (two red wires):

This one gets soldered to the power supply wires of your active pickups.

If your bass has passive pickups, you don't need to use this connector. In this scenario, simply install the supplied cover (see pic below) to isolate the 9V power supply connection.

photo 2.JPG photo (4).JPG

Connector #2 (one red, one black wire):

This one gets soldered to the output wire (red to white) and ground wire (black to black) leading from your master volume control when using a blend/master volume configuration (as shown in pic below).

If you have a dual volume configuration, you need to solder the two individual volume output wires together and (separately) solder the two individual ground wires together before attaching them to connector #2.

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Connector #3 (one red wire, tow black wires):

This is the one that gets soldered to the STEREO output jack. For the barrel/Switchcraft style stereo jack shown in the pic below, the red wire gets soldered to the HOT terminal, the middle black wire gets soldered to the GROUND terminal, and the end black wire gets soldered to the BATTERY terminal.

if you bass has passive pickups, your output jack is likely MONO and must be replaced by a stereo version. You will also need to run a ground wire connection from the bridge to the GROUND terminal as well.

Jack.jpg photo 1.JPG

Now you simply install the stereo jack in the bass, connect the plugs according the wiring diagram in shown post#1 and secure the preamp in the instrument's control cavity using the custom made sleeve nuts.

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If your push on knobs do not fit snugly on the shafts, simply wrap two layers of teflon plumbers tape around the knurled shaft before pressing on the knob.
 
Last edited:
Apr 24, 2013
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spencer mass
sorry if this has allredy been asked because I think it has but can this be run on 18v with say some active emg tw's in my new LXTW
 

duff2

Guest
Dec 16, 2007
528
457
sorry if this has allredy been asked because I think it has but can this be run on 18v with say some active emg tw's in my new LXTW


I should be able to modify it for 18V operation if you prefer that over 9V. Let me try it out tonight and I'll get back to you as soon as I can. It should only require swapping out a single resistor or possibly two.

Edit: no mods are necessary. Circuit runs fine at 9 or 18V.
 
Last edited:

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