I stand behind every amplifier I make. Every Pierson amplifier is guaranteed against defects in craftsmanship and components for the life of the amplifier (or my life, which ever ends first) as long as it remains in possession of the original owner. Second hand amplifiers are not supported by the warranty. Any user modifications or external modification(s) even by a qualified technician, abuse (beware, bad karma...), and damage beyond normal wear and tear will void this warranty. LP

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