hey all, so i was setting the bias on my Demeter power amp, and i got a small discharge of current! while touching the bias point for power tube no. 1 with my meter, i saw a jump of current (snap crackle pop!) hit my screwdriver as i went to turn the trim pot. no harm done, thankfully. BUT NOW, i get an ever so low level hum when i crank the volume wide open. i dont think it'll be an issue for me live gigging, but i dont remember that hum being there before the "event". its also not present in my DB728 or 359. just fan noise. tried it with different basses and preamps, and the hum is ever present. it does, however, go away when i unplug the input to the Demeter. i'm gonna try swapping out the preamp tubes, and hopefully, i wont have to spring on another set of 6550's or send it back to Demeter. anyone else have any ideas?