Crack on sale: https://bottlehead.com/product/crack-1-1-otl-headphone-amplifier-kit/
For those that haven't dabbled, the Crack is (in my opinion) the best introduction to headphone tube amplifiers, skip the hybrids. Be warned, unless you have amazing self-restraint, be prepared to spend at least 2x of what you spend on the amp on tubes!
For those that haven't dabbled, the Crack is (in my opinion) the best introduction to headphone tube amplifiers, skip the hybrids. Be warned, unless you have amazing self-restraint, be prepared to spend at least 2x of what you spend on the amp on tubes!