Old Vibroverb, Blown Speakers or Power Tubes

I am holding on to an old amp of my friend's that he is letting me borrow for some gigging and it sounded great at the begining of tour and now it sounds worn out. Then yesterday there was fuzzing out of the speakers on pretty low levels. I am pretty new at tube amps, and I can't imagine I strainted the speaker the way i play, atleast not for long, Is this two blown speakers, or just replace the 6l6 ge's? how can i tell the difference between what to swamp out, the pre amp tubes or the power tubes?

thanks so much

justin

Take it to a repair shop....seriously. A good repair guy will give you the straight story in a few minutes (and probably an estimate to fix it).

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I'm with adaptable here, by the symptoms you give it could be quit a few things.