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it says that on my 2013 fwiw

There was definitely a problem with some diodes in the power supply; my amp has a date of 10/31/2013 and experienced this failure (fixed under warranty). I don’t know how prevalent it was, but it was a known issue. As others have mentioned, the transferable warranty is another consideration.

When mine blew a fuse it was a bad rectifier tube

Would call Mesa if I were you, I doubt there's much (or any) experimenting going on with different rated fuses for anyone to speak up with experience.

The V2 tube only affects channel 2 so I’d start there for sure....perhaps those settings are just pushing a tired tube over the edge

That’s a rather astute observation that you made, DaveRodda :roll:

I too was once curious about this, and saw that same thread, but it seems there's not a lot to definitively say. Ultimately the manual doesn't mention it - and given that the Mark IV manual did mention it, it's probably safe to assume that Mesa doesn't intend for the Mark V to run 6V6 tubes...

Same thing happened to me, it’s a fairly common issue. As I recall, you can simply disconnect the two RCA jacks from the right side of the chassis (when facing the back of the amp. One is black and the other is white, just make sure to note which is which so you can put them back the same way.

Hmmm....interesting, thanks for sharing. My amp is dated 10/31/13

FWIW it was the low voltage rectifier diodes.

Turned my MKV on this week and about 15 seconds later the power light and footswitch lights went out. Checked the rear of the head and the power/rectifier tubes were lit & not redplating. Smelled a burning electrical smell & noticed a few wisps of smoke coming out from behind the OT so shut...

My amp is at our rehearsal space but I will check it next week if nobody else does it by then. However, especially in single-ended A operation, I would think there'd be a significant difference between pentode and triode - so it seems probable that what they told you on the phone is correct...

Mesa updated the owners manual last year to say that EL 34's should be run on variac power.

The manual says fat mode is derived from input 2 on the Mark I...I guess that is where the LoneStar clean also comes from then.

According to the manual the channel masters are the FX loop return, not the send.

I did notice that when I pulled the chassis to change tubes

I wouldn't worry about ole ryjan.....he's at 2200+ posts and his thoughts on this thread are easily his most sophisticated ever :lol: :lol: :lol: Give it up, man.....the V:25 is a guitar amp, not a Givenchy handbag. If that confuses you, that's your fault not Mesa's :roll: :roll: :roll:

It just doesn't get any better than this. Pure gold :lol: :lol: :lol:

Don't cry lil guy, it'll all be ok, sorry you got butthurt but just get over it :lol: :lol: An "identical" preamp run through a different poweramp is.........different :lol: :lol: 2208 posts.....of which 2208 could be deleted & no-one would be the wiser :lol: :lol:

I would agree with this.....the videos, manual, etc say all those modes are the "same circuit" but there are no Mark I's with simul-class or class A, the volume/overdrive controls are different on all the previous Mark versions housed in the V. I'm not in the amp design and manufacturing...