Pricing and availability
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Price
Average Price: $4,000
High-end/Boutique
$300
$801+
Price Tier
Budget
Standard
High-end
Price History
Based on price data from 3 merchants for "Friedman Butterslax Bill Kelliher Signature". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
The Friedman Butterslax Bill Kelliher Signature amplifier head is not just another piece of gear; it's a bold statement in amplifier craftsmanship. Designed in collaboration with Mastodon's guitarist Bill Kelliher and renowned tone expert Dave Friedman, this amp is a three-channel monster that delivers a spectrum of gain levels, from gritty overdrive to face-melting distortion. Each channel is meticulously crafted to handle the complexities of Kelliher's metal-infused, rock 'n' roll style, ensuring every note is captured with precision.
This 100-watt powerhouse is driven by four EL34 tubes, offering a robust low-end that shakes the room, while maintaining a detailed midrange and soaring highs. The Butterslax isn't just about raw power; it's about control too. With independent EQ controls for each channel and a transparent effects loop, your tone remains pure and uncolored, providing the flexibility to sculpt your sound to perfection.
Built with Baltic Birch and finished in black tolex with a checkered grille cloth, the Butterslax is as tough as it looks. Hand-wired in the USA with premium components, it's designed to withstand the rigors of touring and deliver consistent performance night after night. Whether you're aiming for subtle crunch or all-out sonic assault, the Butterslax is your ticket to tonal nirvana.
Key Features:
- 100 watts of all-tube power with four EL34 tubes
- Three independent channels for versatile gain stages
- Transparent effects loop for uncolored tone
- Custom USA-made transformers
- 3-position impedance switch (4, 8, 16 ohms)
- Includes 2-button footswitch with LEDs
- Hand-wired in the USA with a limited lifetime warranty
Product specs
| Type | Tube, Hand-wired |
| Number of Channels | 3 |
| Total Power | 100W |
| Preamp Tubes | 4 x 12AX7 |
| Power Tubes | 4 x EL34 |
| EQ | Dual 3-band EQ |
| 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 |
| Power Source | Standard IEC AC cable |
| Height | 11" |
| Width | 27.25" |
| Depth | 9" |
| Weight | 42 lbs |
FAQs
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What kind of music is the Friedman Butterslax Bill Kelliher Signature amp best suited for?
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The Friedman Butterslax Bill Kelliher Signature amp is ideal for heavy music genres like metal and hard rock, offering high-gain tones and exceptional clarity, thanks to its 3-channel design and EL34 power tubes.
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Does the Friedman Butterslax amp include an effects loop?
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Yes, the Friedman Butterslax amp features an effects loop, allowing you to integrate your favorite effects pedals seamlessly into your signal chain.
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How does the Friedman Butterslax handle live performance settings?
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With 100 watts of power and three versatile channels, the Friedman Butterslax is well-suited for live performances, providing ample volume and tonal flexibility for gigging musicians.
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What is the construction material of the Friedman Butterslax amp head?
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The Friedman Butterslax amp head is constructed from durable Baltic Birch and covered with Black Tolex, ensuring robust build quality and classic aesthetics.
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Can the Friedman Butterslax amp head be used with different speaker cabinets?
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Yes, the Friedman Butterslax offers multiple output options (4/8/16 ohm), making it compatible with a variety of speaker cabinets for different sound preferences.
Videos
Friedman Amplification
Friedman Butterslax Bill Kelliher (Mastodon) 100-Watt Hand-Wired Head
Reviews
PROS
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Amazing versatility, from clean to high gain
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Clear, articulate, and punchy tones across all channels
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No need for overdrive pedals, built-in gain suffices
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Retains tone quality even at extreme gain settings
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Channels offer classic to modern Marshall sounds
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Encourages dynamic playing due to responsive gain structure
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High build quality ensures durability and reliability
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Offers "ground shaking" low end on higher gain settings
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Misunderstood clean channel provides a wide range of tones
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Unique ability to mimic classic amps while adding modern flair
CONS
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Not ideal for pristine clean tones
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Expensive, might be out of reach for some budgets
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Some may find it overly complex for their needs
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Misleading marketing may set incorrect expectations for clean channel capabilities
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Friedman Butterslax Bill Kelliher Signature.
5.0 out of 5
Based on 0 Reviews and 2 Ratings
Artist usage
Add artist
In the video titled "TOSIN ABASI - Rock's New Guitar Hero: Bringing Guitar into the Modern Age," hosted by Rick Beato on YouTube, the Friedman Butterslax Bill Kelliher Signature amplifier is clearly visible behind guitarist Tosin Abasi. It is positioned on top of a Morgan 2x12 cabinet and beneath a Friedman BE-100.
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.
Genre Usage
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Used With
Based on how musicians on Equipboard use Friedman Butterslax Bill Kelliher Signature, it is most commonly used with the following gear.