Just unboxed a brand new Mark V 25 head last night and it sounds great on the clean channel, but the hum on Channel 2 is unbearable, to the point that I don't think I can use that channel for performing or recording (the purposes for which I purchased the amp).
I have the gain at 12 o'clock, set to Mark IV mode, 25W and the hum is almost as loud as the signal - audible even when playing. On channel 1 it's only noticeable if I turn the gain up.
The ground/lift switch makes no difference. I know it's not the guitar because I tried it unplugged (plus it was the same with both buckers and singles). I also took it off the power strip and plugged it straight into the wall. The only non-amp source I can think of is dirty power, but I have no other power sources to test against until a gig Saturday, which is not really where I want to play amp doctor.
Is this normal for this amp? Should I talk to M/B directly? Thanks!
I have the gain at 12 o'clock, set to Mark IV mode, 25W and the hum is almost as loud as the signal - audible even when playing. On channel 1 it's only noticeable if I turn the gain up.
The ground/lift switch makes no difference. I know it's not the guitar because I tried it unplugged (plus it was the same with both buckers and singles). I also took it off the power strip and plugged it straight into the wall. The only non-amp source I can think of is dirty power, but I have no other power sources to test against until a gig Saturday, which is not really where I want to play amp doctor.
Is this normal for this amp? Should I talk to M/B directly? Thanks!