Bottlehead Speedball 1.1 Upgrade for Crack Amplifier
Unlock the full potential of your Crack with the Speedball upgrade—a high-performance constant current source (CCS) modification that elevates your amp’s dynamics, clarity, and resolution. By replacing the stock plate load resistors with active current sources, Speedball tightens bass, improves treble extension, and enhances imaging without losing the signature warmth and smoothness of the original design.
Whether you’re building a Crack from scratch or adding this to an existing build, Speedball brings a clear and immediate sonic upgrade—and a fun, accessible mod for DIYers looking to take their amp to the next level. Buying this upgrade at the same time as buying a Crack saves you 10% off the upgrade's cost.
The same Speedball 1.1 kit is an upgrade for Crack 1.1 and the original Crack. Most builders can complete this upgrade in an evening, but remember that there is no award for the fastest build. Check out our user forums for more impressions and tech support.
Pairs well with
Bottlehead Speedball 1.1 Upgrade for Crack Amplifier
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Yes, you can do it!
Bottleheads have been assembling our kits for over thirty years. Every kit includes the parts and components you need to build the kit plus an incredibly detailed manual with step-by-step instructions and close-up photos. Check out this sneak peek into what every manual includes. We've also put together a handy list of the tools you'll need to bring along.
Need some assistance or inspiration? Check our user forums.
Just add tools
Bottlehead kits come complete with everything you need to assemble. We provide the wood base, chassis plate, tubes, hardware, wire, circuit boards, and electronic components. You just provide the tools and solder.
Check out this blog post to see what comes in every kit, and this handy list of tools and equipment you should gather before you begin.
FAQs
Please read our FAQs page to find out more.