According to Hartke's [website](http://www.samsontech.com/artists/stu-hamm/), Stu Hamm uses a Hartke HA5500 500 Watt amp head. He is quoted saying, "Hartke amps and speakers have been essential to my sound for over 15 years. The tonal range they give me has allowed me to expand my musical boundaries. I just can’t be Stu without that Hartke sound."more
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