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As the title says I have a buzz on my Vert Recto 2x12 cab when I play at high volumes. When I chug a C bar chord, I get a resonating buzz. After some investigation I discovered it is the Mesa/Boogie plate on the front. Here's the thing. It's screwed AND glued to the grill. I'd remove it, but I...

I notice when I bring my guitar close to the faceplace of my Mark IV short head, I get a loud hum from the guitar. The back of the faceplate is painted black. My question is this: Is it just black paint, or shielding paint? If not the latter, I have some stew mac shielding paint (For guitar...

Hey guys, My Mark IV seems to sound Fizzy as of late on the distortion channels. Either I'm becoming more tuned to the amp or something has changed. To get these suggestions out of the way, I've tried a couple of different cabinets, cables, guitars, and totally re-tubed the amp(Winged =C='s...

Hey, I have a Mark IV and am About to retube it with 6L6s. From what I've read it sounds like I don't need to get a matched quad (even though I will) because it's not a traditional design in that it's two separate pairs, and not one quad. From my reading this is what it sounds like to me...

Need a cab for my Mark IV. I've played the recto vert 2x12 and really dug it, but have never heard the halfback. I'm aware of the speaker/architectural differences, how about the tone? Weight?

Hey guys. I need a cab for my Mark IV. I've been using a couple of 2x12's and 1x12's I had but none of them are cutting it. (Granted one's not meant for guitar, and the other just isn't a high quality cab) I played my MarkIV through a celestion loaded crate 4x12 a couple weeks ago. That...

Hey guys I got a used Mark IV (From a local store) a few months ago, and when I jam through my 2x12 once in awhile the top speaker cuts out, and it's happening more frequently. I tap the cabinet with my foot and the speaker comes back, albeit for a short while. It's two 8 ohm speakers making a...

Hey guys, Was in the store messin with some mesa's today. NO RK, but a roadster and an ACE. Overall two VERY different amps to be sure. I have a Mark IV, but want to grab some other stuff to add to the family down the road. I'm not even sure if I would go RKII vs. Roadster, but this question...

Hi, I recently cleaned my Mark IV Short Head up a bit and when I took off the faceplate there was a 12ax7 TAPED to the wood chassis baffle board as a spare. Is this normal or did I just get an easter egg? It's a 2002.

Had a thought for a possible mod regarding the mark's "flubby" bass... Not sure if many of you are familiar with the MTS Randall modules (The other forum on grailtone), but some of them have been noted as having "Flubby" bass as well, namely the Recto Module! There is a mod we do that helps...

Hey guys, Grabbed a Mark IV shorthead yesterday on a whim (My F-50 is now up for sale in the Classifieds) and need a cab. My current cheapo 2x12 just ain't cuttin it. When I originally auditioned the Mark IV, I played a Vertical Recto 2x12 and it sounded pretty godly! Though Before I just go...

Hey all, I made the mistake of Playing a Mark IV the other day and I had to have it. I'm a tweaker at heart and wanted the versatility, so there you go. The problem is I can't afford to keep both, so trades are out. Will have pictures up soon. With the Exception of a small ding/blemish on the...

Of course, I'm talking about the Dirty Channel. I know the tone stack is pre distortion so it "Shapes the characteristics of the distortion" rather than the tone, but **** if this knob isn't USELESS! I mean if there IS a change, it's SO Subtle what's the point? I tried the following: -I take...

Ok this is weird. I recorded some tracks with my F-50 5 days ago. I haven't used it since. I powered it up today and it won't make a peep! I checked the record out and that's normal I get signal with the mute switch on or off. If I turn the dirt channel all the way up, I'll get a low fizzy...

Besides the Parallel to Series mod for the FX loop? (I might use a DPDT switch or push-pull pot to be able to choose) I LOVE the amp, and have messed with a couple tubes. So far I like the C90 best with the amp I think. However I'm curious if there are mods that can be done from the amp that...

Before I took the Express back, I snapped some pics. When I spoke to the Boogie Tech, he said as long as I wasn't an idiot, I wouldn't void the warranty opening it up when we spoke about possible mods. (They REALLY just don't want anything to do with mods, the Hollywood mod is considered a...

Well, I tried. I REALLY wanted to love the Express but it just didn't happen. Tomorrow was the last day to return for a full refund, and I don't think my mind would have changed. The new F-50 there was $1045(?) and a MINT year old F-50 was there for $795. I wasn't thrilled with the amp and...