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With regards to soldering up your own footswitch, I've been looking at the Mk IV schematics and the ones on the web always leave out the part about the footswitch. Therefore, I can't tell if the footswitch needs to be on-off or momentary-on. That's an important distinction. It doesn't really...

When looking at other people's footswitches, remember that the Mark IV has two different types of switches that can be used: (1) via the multi-pin connector on the underside of the amp's chasis used by the big footswitch pedal board that came with the amp, or (2) via individual...

Yes, the amp gizmo midi interface...that's a pretty good call there. Chip

Did anyone ever come up with a schematic for a Mark IV footswitch? The guy on the thread below might be talked into building his own fooswitch. I want to take a look at the schem to decide if it'll be easy or a nightmare...

Are you into soldering? If so, I think that you could fairly easily make your own footswitch for the amp. I/we here could guide you through it. So, yeah, if you're into solder, post here and we can start talking about options... Chip

Good luck with the learning process. I'm a long-time Mark series fanboy, but I do often find them frustrating. Some days, it's so good...you'll feel like you're playing God's own amp. And then other days, you're thinking that a $100 Line 6 amp could sound better. So frustrating. Why? I...

Cool. Now remember, I don't have a Mark III, only a Mark IIC, so YMMV. I'll just offer suggestions and then you'll surely see the best way to do it once you have the amp open. Presumably, you have one of the Mark III schematics from the web. Note that these are of questionable accuracy, but...

If the pull-deep on the Mark III is implemented like it is on the Mark IIC+, then it is the act of physically pulling the knob that actuates a mechanical switch that brings a cathode bypass capacitor into the circuit. So, you won't be able to put that on a footswitch without some soldering...

As the guys said above, a simple OD pedal in front is usually most people need to get a recto to sing a little more. Most overdrive pedals cut some of the bass, even with the distortion knob turned to zero. By cutting a little bass, your guitar signal is more focussed on the mids and highs...

It's good to know that the amp works via the FX return. That means that you don't have any super serious problem. You still might need to take it to a tech, but the problem is pretty well limited to the preamp, which is good. Just to make sure that its not a tube, turn off the amp and pull...

There's no tube that Ch1 uses that the other channels don't use as well. So, if the other channels sound unaffected, then it's not a tube. To me, it sounds like one of the relays or LDRs died on you. These two elements are used in different places within your amp to switch the circuitry...

As stated above, closing off a combo is a very bad idea. It will overheat badly and the amp could die. Bad bad bad. If you want the closed-back sound, you'll have to get a closed back cab. If you're gonna get a cab, you might as well replace your combo with a head. Note that you could...

Pictures! Please! <must, have, sexy, amp, pron....>

I've never played a Mark IV, let alone one with 6V6s. I'm very intrigued. In my imagination, however, I get stuck on the issue that the Mark IV is a beast that was designed as a 90W amp...not an amp designed as a ~20W amp, like a 2 x 6V6 lunchbox would be. There's a huge difference there...

Regarding the Mark IIC+ Mini-Me, if they'd switch their lunchboxes from EL84 to 6V6, I think that they'd have something. It wouldn't sound like a IIC+ for metal rhythm, but the 6V6s would make for possibly the creamiest lead tone ever heard. I couldn't make it sound good in my amp (IIC+...

Thanks, George. It's funny. After writing about my FrankenFender (and kinda badmouthing it), I fired it up again this morning. Since my failed IIC+ experiments on it, I ended up using my ears to guide my circuit fun. I cut way back on the gain ad pulled more bass out of the early part of the...

It's not that easy to clone something. For example, you can't just go buy a simulclass transformer (except from Mesa). It's got a somewhat unique way of being wound. So, while there are lots of output transformers that are built for tube amps (Hammond et al), there isn't one off-the-shelf...

Petrucci would sound awesome through anything he played. He could say any piece of gear sounds fantastic because, in his hands, it does. <Well, assuming that you like how Pretrucci sounds at all, then this is true>. Remember the recto / road king years? He sounded awesome. Mark IV years...

Does any know if they were actively producing them and shipping them to stores as in-store inventory, or were they produced only on special request to the factory? You know, kinda like getting a new TriAxis...I hear you can still get them, but I think that you have to call Mesa. Was that how...

In reading the other recent thread about the market for a Mark IIC+ reissue (or not), I remembered that (I believe) Mesa kept producing the Mark III for *years* after they released the Mark IV. I want to say they the Mark III was still available into the late '90s (that would be 5-10 years...