Friedman BUTTERSLAX – Bill Kelliher Signature 100w Head 2026 - Black

Brand New from Authorized Friedman Amplification Dealer

Hi-Proof Guitars is an appointment only showroom in Katy TX. We only carry the good stuff, from high end electric guitars, acoustic guitars and primarily, tube-amplifiers. Message or reach out for more information.

Bill Kelliher’s guitar playing is rooted in metal, infused with rock 'n' roll, progressive rock and sprinkled with bits and pieces of thrash, punk, and psychedelic-ness. So, when it came time for Mastodon’s guitar player to design the ultimate amp to cover the complexity of his playing, Bill decided to team with long time friend and respected tone guru, Dave Friedman.

The result of this collaboration is the new Friedman Butterslax, a 100w, three channel beast powered by 4 x EL-34s with gain, more gain, extreme gain and some more gain to top it off. But “high-gain” is an over simplification of the Butterslax - what Dave and Bill created is a super high gain, ultra tight amp that delivers deep, rich, low-end that will make your pants rattle. Yet, the Butterslax delivers detailed midrange and singing highs that capture every drop of each refined note.

• Type: Tube, Hand-wired
• Channels: 3
• Output Power: 100W
• Preamp Tubes: 4 x 12AX7
• Power Tubes: 4 x EL34
• EQ: Dual - Bass, Middle, Treble, Global Thump and Presence
• Inputs: 1 x 1/4"
• Outputs: 2 x 1/4" (4/8/16 ohm out), 1 x 1/4" (line out)
• Effects Loop: Yes
• Footswitch I/O: 1 x 1/4" (channel, boost)
• Footswitch Included: Yes, 2-button footswitch
• Bias Type: Adjustable Fixed
• Construction Material: Baltic Birch with Black Tolex
• Height: 11"
• Width: 27.25"
• Depth: 9"
• Weight: 42 lbs