I am running a simple rig at the moment to work on a noise issue with a brand new 2:90. Preamp into 2:90 into 2 Mesa 4x12 cabinets. When deep is engaged there is a very low end hum that is very apparent. It is still there when not engaged but not nearly as noticeable. The Mesa 2:50 I just traded was dead quiet with the preamp. What would be the first things to check regarding this?
I have already checked cables and make sure it was not a ground issue. The ground switch on the preamp or the power amp does not affect the noise at all, I even tried a hum eliminator in between the two and it altered nothing in the hum.
Thanks for any input.
I have already checked cables and make sure it was not a ground issue. The ground switch on the preamp or the power amp does not affect the noise at all, I even tried a hum eliminator in between the two and it altered nothing in the hum.
Thanks for any input.
