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Failed after a month
Hopefully, Thomann is replacing my Rumble 40, but it failed after a month with what I suspect is a Switch-Mode Power Supply (SMPS) problem. This is apparently a known issue with these units. I strongly advise holding on to your packaging. I am having to purchase new package to meet Thomann's strict (rightfully so) return criteria. Otherwise the Rumble 40 is an excellent practice amp.
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