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.
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.
