Brian Hazel (A New England master of tube repair, design and especially great with tube tuners) designed and built those amps. I marketed them. Sadly, Brian passed about 6 years ago. I truly miss talking with him. I am in the process of reviving the Phono stage he and I designed. The amps sold for about $800 - $1000 when I sold them but they are special. They use vintage American made transformers and they are completely hand wired. A meticulous process. The inspiration was older designs, modified for ultimate sound. Low wattage, mostly single ended stuff. We were searching for the ultimate low wattage tube amp. Everything we built and sold was top quality. It's worth what someone will pay for it. I wouldn't do this kind of work again unless we were charging at least double.