you guys solved one problem for me heres hoping you can help with this one too. turned on the rig today and MP-1 has developed a massive hum. i run it in stereo with a JMP-1 and the noise from both were comparable, but today the MP-1 is blasting through the gate. the JMP-1 is still as it was. the hum is constant. inserting ground loop killers into the chain at various points had no effect, nor did removing the MP-1 from the rack and running straight to power amp, again with ground loop killers. it is definitely a problem in the MP-1. any ideas guys? im reluctant to drop cash on mods if its just going to keep having problems but i really dig the sound im getting right now. i have a couple of other rack preamp modellers/FX and the MP-1/JMP-1 combo beats them hands down. cheers in advance
edit: also changed preamp tubes with no difference