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I’m not an expert but IIRC the manual states that the mark iv needs no bias adjustment. There is a whole essay about it.

I just want to add to this 11-year-old thread, in case there are other people troubleshooting the mark iv FX loop. For me, the suggestion to just use a patch cable, from the FX’ send to return, confirmed that there was nothing wrong with my effects loop. In my case, I had a few issues: a bad...

Sorry it's taken me three months to log back in and see your reply. Congrats on your purchase! When I first spoke to Mesa Boogie they asked me for the serial number of my Mark IV. Apparently, the risk is greater in certain runs so calling them to see where your amp stands is a good idea. I feel...

Thanks!

I'm still new to using pedals and so have read some pedal layout guides online. [I know. Danger! :lol: ] The first layout I made for my board had the signal path go from Left to Right, which is how I read and is my default way of thinking about a signal process. Articles from guitar mags...

Hi group, I want to follow up and report back on what happened with my Mark IV and also thank everyone who participated in the thread. I did contact the factory and sent my Mark IV chassis in for repair. The damage was caused by leaked capacitors. Although they were not able to repair it...

Thanks for the advice. I'll call the factory or check the website.

Thanks for the reply, woodbutcher65, especially since you helped me out when I was trying to figure this all out earlier. http://forum.grailtone.com/viewtopic.php?f=27&t=78857 I wrote about the situation, above, if you can see my reply to swbo101. I would get a second opinion but I don't get...

I was SO into my Mark IV and had been digging deeper into it than I had ever before. But if I've got to look around for another amp, after so long, I figure it makes sense to hear what's out there. The Triple Crown is interesting because I've been building sound presets for my songs using MIDI...

I was getting noise. A blown fuse. I replaced the tubes. Another blown fuse. Then channel 1 cut out. I took it to a repair shop next to Berklee School of Music that was double recommended by my childhood guitar teacher and also a veteran pro musician. The amp tech said there had been some...

After 18 years of playing and home recording through a Mark IVb Combo, I've got to get a replacement. I'd go for another Mark IV but worry that they're old and don't want any more headaches. What's the experience of going from a Mark IV to V? I'm thinking of maybe getting either the Mark V 25W...

Thanks Tuna141 & woodbutcher65, for these responses. I did read them at the time but must not have replied.

Thank you for explaining this, Chris and Woodbutcher65. I tried replacing my new tubes with the very old tubes that they replaced and made it through a couple hours of playing without blowing a fuse, so it seems, as you both wrote, that the new power tubes are the source of the problem after...

Hi. Can someone please help me understand the "Description of tube functions" on page 17 of the Mark IV Revision B manual? I'm trying to diagnose why my combo is blowing fuses. It's got four new tubes in slots A,B,C,D; they're about 8 months old. None of them glow red hot when I look back...

I was able to order the missing ring from Mesa Boogie. It was reasonably priced, too.

Thank you so much for taking the time to google and reply! Using your photos I was able to make it fit, like a Tetris master. But now Ive got to find a replacement for the missing ring key. What a weird doodad! I have no idea what to even call that thing.

Hi Boogie Board. I'm a singer songwriter who plays a Les Paul studio through my Mark iv. Even though I've had it for a long time I am reapplying myself to learning how to get good tones and use this instrument; looking forward to reading everybody's comments in the mark iv threads. Space is at...