Singlepower Audio PPX-6SN7 Tube Amplifier
I was among the first to purchase one of the Singlepower Audio tube amps. The version I have is a slightly modified PPX3 which is their base model. This one is a step up and takes 6SN7 tubes instead of the cheaper 6CG7 mine takes. It's expertly constructed and it drives headphones (even the HD600's) very well. I have never had any problems with it. If I did, I know the support is excellent.