Eskimo Joe, seeing that you now have the MGMV, I'd love to hear what you make of it here. Both in isolation and versus the Mojo Vibe?
In other MGMV news, I was experiencing some-bleed through from the MGMV's oscillator, only apparent when running a fuzz after the Mini Vibe and directly related to the velocity control of the MGMV itself. I discovered I could reduce and eliminmate this bleed-through by adjusting the lay of the power supply cable from my Burkey Flatliner. Keep in mind my pedals are mounted on a pedal train with it's metal frame.
I contacted Bjorn for his advice and though it might be useful to document it here in case other users encounted a similar situation, might even save BJ typing it out again via email for someone. Here's what Bjorn had to say ...
There are a number of measures taken within the MGMV design to reduce feedthrough from oscillator and I'd say from what you tell me there's a feed through through powersupply cables.
There's noway of addressing this other than lead dress since leakage occours outside of the box.
If you can eliminate this by wire routing that is the best way.
On the functions of feedthrough in pedalboard systems DC cables are the cause of many problems and especially with high gain low signal levels.
In systems like this humlevels must be kept low from the power supply and the Burkey would be sufficient in this. However feedthrough can sometimes be caused by magnetic fields. This is something guitar technicians are payed handsomely to reduce in systems of professional guitarists............I know a few such technicians.
The art is no more difficult than using your ears to detect noiselevels and being aware of what can occour.
The bottomline if you can place wires so that there is no feedthrough then that is the best solution.
Technically what happens is that extreme gain pedals can pick up disturbances extremely faint through the combination of high gain and high impedance and low signal levels, the latter diminishing the signal to noise ratio and this can occour in powersupply wires.
This was a simple fix, just move the dc cable a few inches and the problem was solved. It did cause me to scratch my head for a little while before that though.
Posted: Wed Feb 28, 2007 1:52 pm
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