The Crack 1.1 arrived today. This is a kit for a OTL headphone amp. It's designed for 200Ω impedance phones and up. Came well packed. Nice looking kit! No affiliation: https://bottlehead.com/?product=crack-otl-headphone-amplifier-kit I'm going to build it stock, no modifications. I do want to powercoat the top plate and transformer end bell. I'm not sure what colors to use. I like the way @marantzfan did his 2A3. Thoughts on colors?