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I know anything is possible, but 1 brand new and 1 used amp with the same issue? I guess the brand new one was on the floor...would abuse on floor cause this? I know tube amps are pretty sensitive. Thanks

Hello all, I purchased a barely used Mark V last weekend, brought it home, set it up and experienced a weird issue with the volume kinda rolling up and down intermittently. It went away for a couple sessions so I thought I had solved for it with a cable swap. Well it happened again friday, and...

So here is my update, went to get 12ax7 today at another stores and they only had the SPAX7, which I understood to be better replacements of the 12AX7. So I bought 3 of them and came home. I replaced V1 with brand new 12AX7 V2 Same V3 SPAX7 V4 Same V5 SPAX7 V6 Same Results? Same. Channel 3/4...

Thanks. These ones have no printing on them so assume they are the JJs. I couldn't locate any tubes in town Sunday but will try again this weekend and report back. Would the power tubes also be culprits or likely a set of preamp tubes for the fix?

Thank you both for the reply. I took it apart just now and confirmed Mesa 12AX7 in V 1-6. The power tubes are mesa 6L6 GC and the other 2 on the right are not matched (is this an issue?), one is a mesa 5U4GB and the other an ElectroHarmonix made in russia. I have 1 spare 12ax7 here, but feel...

Hello, another day, another issue with my beloved dual rec roadster 100w head. I use the amp maybe 5 to 10 hours a month at bedroom volume, so not abused at all, but this happens from time to time. Tonight, I was playing a song switching between clean channel and channel 4 and it cut out...

Hi all, trying to trouble shoot a weird problem and cannot find anything in my manual or online. My Mesa dual Rec Roadster 100w head had some intermittent problems with channels. In middle of playing of a sudden channel 4 goes out, then channel 1, but 3 and 2 work. bBoth channel 1 and 4 go out...

Yup you nailed it here thank you so much, I returned the recto tube today. I replaced both 3 and 4 just because and problem fixed instantly. The last thing I wanted to do was bring the amp in like they suggested, pull and plug tubes was way easier. Finally playing again!

So my saga with this amp continues. The other night I was strumming along low volume with the amp that had not moved since I brought it home and mid chord my channel 3 died went totally mute, no weird noises or anything. I switched over to channel 4, and also nothing. However, channel 1 and 2...

Just spent another 2 weeks out of town so need to be back on this now. I don't think the fuse has made a difference, and Mesa seemed extremely uninterested in picking up the shipping for this amp, so that is last resort. The only thing I can think of that is easy is switching power cable. When...

I finally swapped the fuse out this evening and after about 30 mins of the mellowest playing session, sitting here reading a tab on the PC, not even strumming the thing, it just shut off completely. And about 3 minutes later, it turned back on. After another 5 mins of the amp just being on and...

Sorry for the lengthy delay here guys, I was in the US for 9 days for work and am just back this weekend now dealing with music related things. I did talk to mesa the day before I took off and they looked at the video and concluded that there was something in or around the fuse that was likely...

OK- the amp gremlins caught on camera! There are two videos here and I'm pretty sure it is now obvious what I'm dealing with (no 'sound' bar involved :? ) - Today I switched the amp power cable directly to the wall outlet and only kept the pedals in the POWER bar -I played very briefly today...

I just read what I wrote and should clarify, I meant power bar, not sound bar, sorry about the confusion! (I just recently purchased one so it must have been on my brain). That makes a big difference. The power bar is pretty heavy duty and high quality and I don't suspect this to be a problem...

Thanks for the discussion here everyone. For background info the amp has never left my house or the outlet it is plugged into through a brand new musician-quality sound bar. The house wiring is 5 years old and the only other thing on that circuit is a Mac computer. I've never had any other...

I'm nearly done with this amp, it has been checked over by the local mesa dealer who cannot figure out anything wrong (or will not spend the time to really test it out). It has been turned off for nearly 3 weeks and just now I had it going at 3/10 volume for about 10 mins and all of a sudden it...

I only have one FX Loop on the roadster so I don;t think that will work for me. Basically, there is a problem in the FX circuit somewhere. When I put a cable from send to return, it operates just fine, lots of power and sounds as it should. When I hook up the peddle board to the send and return...

So i put the entire pedal board in line before the input jack to see if maybe there was a bad pedal or power connection and everything worked fine. There are only 4 pedals and they all did what they were supposed to do, so that leads me to believe that the pedals and effects board connections...

So I swapped a spare 12AX7 here for both V5 and V4 and same problem. But when I connected a cable from send directly to return, it came back to life! So I guess the next thing is to isolate when the problem in the FX circuit is coming from. Any thoughts here? Would it come from the chain of...

Thank you thank you for the informative post. I think I have a spare pre-amp tube kicking it somewhere in the guitar room so will get to this when I return home this weekend. I know the send levels have not been touched and are at the mid position, but I will also test out your suggested...