I don't believe Manny that the amp will sound worse. One day one of the components inside may just wear out and fail. If you plan to keep the amp for a longer time and it works just fine, a once over may be a good idea. Just ask Outlaw what their service is on that and what it would cost. I have a 7500 and I plan on keeping it for a very long time. Outlaw products are very solid and are keepers.
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"There is one who comes after me who's sandals I am unworthy to unloose." John the Baptist