Practicing last night and my Rumble 500 head starting making some crackling noises intermittently (it actually was doing this at last rehearsal but I wrote it off as a bad cable) so I swapped cables and basses and it continued until at one point all the output dropped out for about ten seconds, then came back. I use different cables and cab at rehearsal so the only common component is the head. Naturally gig is tomorrow night and with work and hockey games I won't have time to really do any further troubleshooting or serious amp shopping before setup tomorrow. However, the venue is down the street from a GC so I would have time to run down there and pick up a new head if my rumble is acting up and they have two heads in stock that are priced within $50 of each other that I'd consider, but haven't played either one. So the question is: Mesa M6 carbine (used) or Mark Bass Little Mark Tube 800 ? Thanks for your input. The extra info: Primary use is for classic rock and soul covers and originals band Will be paired with fender 410 neo cab for gigs (until I divest myself of that) Primary basses used are Fender Precision elite and G&L SB2 Markbass head is $699 new, M6 is $650 used, but add $100 for the GC pro coverage Just sold my Rumble 500 combo the other day so the price differences are irrelevant, and now of course have no backup amp. Yes I can go DI into the board, but the drummer and I like having my own cab on the backline, so this is an option if absolutely necessary. I am concerned about having to mail the markbass somewhere for service as opposed to just taking the mesa back to GC if there are any issues. I know that I will hear get the one that sounds better responses, but I'm seriously only going to be able to run in, grab one or the other and get back to the gig to finish set up.