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PostPosted: Mon Jul 27, 2015 12:49 pm 
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Bottle Rocket

Joined: Fri Dec 20, 2013 1:34 pm
Posts: 2
Location: New Hampshire
I had a failure of my one year old Mesa Express 5:50 Plus head and had it repaired under warranty. It was a difficult problem to diagnose and it began to fail at a gig by distorting and losing power on the clean channel (Channel 1). I tried to troubleshoot it by replacing the power tubes and eventually all of the preamp tubes with no improvement. At some point the reverb quit too. After bringing it to a local Mesa authorized repair shop, the final story from the repair tech was that the reverb failed due to a switching transistor and the distortion was caused by a bad capacitor.

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PostPosted: Mon Jul 27, 2015 2:33 pm 
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Mark II

Joined: Mon Dec 13, 2010 3:44 pm
Posts: 76
Interesting for me to know that : I just had the same problem with my 5:25 Plus (two years old). On channel Clean, distortion and loss of power. Other channels didn't seem to loose power but they sounded a bit distorted too (ugly distortion). It's now at my Mesa authorized repair shop after I changed all the tubes to no avail. I'll keep your post in mind if they don't find anything.


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PostPosted: Mon Aug 03, 2015 3:48 am 
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Mark IV

Joined: Mon Jul 02, 2007 6:53 am
Posts: 933
Location: Newcastle NSW Australia
Granddrink wrote:
I had a failure of my one year old Mesa Express 5:50 Plus head and had it repaired under warranty. It was a difficult problem to diagnose and it began to fail at a gig by distorting and losing power on the clean channel (Channel 1). I tried to troubleshoot it by replacing the power tubes and eventually all of the preamp tubes with no improvement. At some point the reverb quit too. After bringing it to a local Mesa authorized repair shop, the final story from the repair tech was that the reverb failed due to a switching transistor and the distortion was caused by a bad capacitor.


ok thanks for the info :)

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PostPosted: Sun Apr 02, 2017 7:15 am 
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Bottle Rocket

Joined: Fri Mar 31, 2017 2:02 pm
Posts: 19
Granddrink wrote:
I had a failure of my one year old Mesa Express 5:50 Plus head and had it repaired under warranty. It was a difficult problem to diagnose and it began to fail at a gig by distorting and losing power on the clean channel (Channel 1). I tried to troubleshoot it by replacing the power tubes and eventually all of the preamp tubes with no improvement. At some point the reverb quit too. After bringing it to a local Mesa authorized repair shop, the final story from the repair tech was that the reverb failed due to a switching transistor and the distortion was caused by a bad capacitor.


Not sure if the OP is still around but I'm curious, how many hours on the amp when it began to fail? Doesn't most solid state stuff fail very soon after putting power to it or not at all? (unless of course an external event triggers it.)


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