The R8 was fun while it lasted. Something went wrong inside with one of the channels so I’m returning it rather than mess with it. I’m going to try the Muzishare X7 for the same price in Amazon. It actually looks like a much better design, using better parts, better transformers, and even has a balanced input. The drawback is it won’t take EL34 tubes like the R8, but that’s ok. I like the KT88s.