Here is a link to the Smash info page in the Bottlehead store -
Smash(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fbottlehead.com%2Fwp-content%2Fuploads%2F2014%2F04%2Fbottlehead-smash-preamplifier-kit.jpg&hash=c073cba4991b0924a173d7bad31188e95a657fc4)