Hey all. Got an Ibanez BTB575FM this weekend - normally wouldn't be my style, but it was part of a mutually fair / beneficial trade and I've never had such a beast, so I thought "what the heck." I like the bass more than I expected to like it, and am actually very pleasantly surprised with the sound of the Bartolini MK2 setup installed, but I am getting an occasional series of little DC pops from the preamp at idle. Waveform zoom attached, and a brief direct-captured FLAC file typifying the troublez can be heard / downloaded here. The amplitude of the little pops seems to increase with a bump up on the board's low EQ, and they don't seem to start until the bass has been plugged in for a few minutes. For those who have a much greater mastery of electronics theory than myself, what are some things I might look for when I finally pull the preamp board?