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Hey, I've had the exact same problem but couldn't spot any bad connections. Let me know if you figure out what your problem is. I've also been told to check the switching matrix on the amp because it helped another user with our problem, but your experience leads me to believe that it's more...

anything with celestion V30 speakers and a closed back will complement the amp well.

Thanks for the replies, it's not the rocker switches in the back, must be the contacts on the amp. I'll check it out again.

http://www.cs.cf.ac.uk/Dave/mclaughlin/art/sinewave.html#eq McLaughlin's amplifier of choice is a Roland Jazz Chorus 120

I ran into some trouble the other day, as I know a couple of you guys have before. During practice, the footswitch starts to malfunction while everything is turned on. (I do have the ftsw mode enabled) The EQ switch works, but the Loop doesn't. The channel is permanently stuck on lead, but...

willrock, that's exactly what I'm doing right now... until I can get a midi device. If you have time, share your settings with me. Here are mine: (By the way, many of these settings were inspired by people on this forum, as well as on the bossgtcentral forum) On Mark IV, across top row...

Thanks for the reply, and the suggestions. I'm hooked on the lead channel of the Mark IV. I've been using the GT-8 preamp for my band's gigs, but it's worth buying a midi device to use the boogie tone.

Haven't posted here in a while, but everytime I have it's been helpful. So here's my situation: I run a Boss GT-8 in the effects loop of the Mark IV using the 4 cable method. I bypassed the preamp of the GT-8, using it only for wah,delay,phlanger, noise gate, and reverb. My problem is...

Thanks, it is pretty helpful.

No, it wasn't a brainfart, more like a noobie question (which is why I came to this forum :roll: ). But yeah, I'll see if I can figure out what caused the fuse to blow. Any other ideas besides bad tubes that have been common with the older Mark IVs?

Thanks for the replies, fuse was blown, and when I replaced it, everything started working again. I don't know why the fuse blew though. The tubes all look good to me, tested them for about half an hour at the same settings.

Refer to my post, too if you need to, there were some helpful replies. I might have had the same problem as you. http://forum.grailtone.com/viewtopic.php?t=3651

Okay, thanks. Edit: 3 amp slo-blo fuse, which is correct, but the one in it is 250V, don't think the V matter though (Mesa recommends 100 or 117V).

Thanks a bunch, I will replace the fuse and check the tubes...

Basically, I need help trying to find out what went wrong. I've got a Mesa Mark IV small head that I use with a Boss GT-8 (effects loop/ 4 cable method). It is hooked up to a 2x12 rectifier cab (8ohms in). Today in practice the amp shut down, fan and everything. I did notice a smell of...

Is it ok to use a normal (not balanced) 12ax7 preamp tube in the V5, or is this something that will cause problems?

I've got the MkIV head and 2x12 Recto cab (Vintage 30 speakers). If you're into metal, then this is the cab for you. Great for hard rock, too. Now I haven't really experienced the thieles but you will not be disappointed with the recto cab.

Yeah that second gain should have been drive. I am playing at bedroom volume, so that might be it. It's not a combo, it's a short head, and my guitar setup is pretty good, no string buzz, etc. I've got both gain and drive pulled, and the presence is pushed in. I think it has something to do...

Yeah that would be helpful to know, wouldn't it. It is a Mark IV. And to add to my description, the buzz/fuzz/overtone occurs only at the beginning of those hard chords I was referring to. Could this be something to do with too much preamp distortion?

When I play on the lead channel, settings: gain 8, treble 8, bass 3, mids 3, gain 8, presence 5, channel volume 2, master 3, V shaped eq ( and even without the eq), I get sort of a scratchy tone when I play chords, and this noise is more prevalent on the higher 3 strings. The tone I want comes...