That's cool. I haven't heard of a speaker mute button before. Handy. I was a bit concerned that you were frying some circuits!
At least that has been ruled out of the equation.
Yeah depending on usage you may well be due to replace your original stock tubes. I have learnt that manufacturers no matter the reputation or selling price (Mesa Boogie are no better than any other in this regard) tend to favor cutting costs by fitting units with sub-standard tubes. Totally weird logic to me. You may even find that upon retubing your amp an improvement in tone will be heard.
[EDIT] >> I assume the left-most (from the rear) of the speaker outputs is connected to the internal speaker? I would guess that despite setting your amp to "Silent Recording" mode, it should still be connected to a speaker load? It would be advisable to check the manual on this to see what Mesa has to say about proper connections applicable to your combo.
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This post has been edited by Neurologi: Nov 1 2009, 06:20 PM