Weird Volume Fluctuations in my Mini, Help?

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Reeko

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Guys,
Recently, I have had times where my Mini will drop volume off for short periods. The amp is about 4 years old, played several hrs a week.
I noticed it last in the Clean/Pushed channel, not sure if the Vintage channel has the issue.

Could this be a Tube Issue?
Preamp or Power Amp?

Should I expect the tubes to be going bad after 4 yrs?

Thanks for any help.
 
You can expect tubes to go bad at any time. Usually right before or during a gig.

I would start with the PI. Especially if the problem is on both channels.
After that, start at V1 and work your way up.

As a maintenance issue: If you've been using it a lot at high volume, I'd change the EL84s. If you generally play at low volume or don't play often, then they probably have life in them.
 
Not sure if you have one of the originals, but there was an volume oscillation issue. I personally never experienced it.

Supposedly only effected 10W modes. Are you using 10 or 25w mode?

http://forum.grailtone.com/viewtopic.php?f=24&t=63561

If this seems to be your issue, contact mesa and they should be able to repair it for you.
 
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