![]() has a lot more wires than the Crack (partly due to having two output transformers) so it’s a slightly more complex build, but it’s still fairly simple point-to-point wiring with no circuit boards or finicky micro components. (The Crack is an output transformerless (OTL) design which will only work effectively with high impedance headphones.) ![]() uses output transformers to work with a wide range of headphones. It’s a different design to the Crack as the S.E.X. The next step in the Bottlehead range is called the Single Ended eXperimenter kit (or S.E.X. ![]() After thoroughly enjoying the Crack for over a year, I decided it was time to enjoy the next step up in the Bottlehead range for both a challenge and a new step towards audio nirvana. Some time ago I built the Bottlehead Crack amplifier and reviewed both the build process and the resulting sound.
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