I'm working my way through a build of Bruce Heran's 6DJ8 headphone amp, the schematic is available on diyaudioprojects. I decided to build it because I had most of the parts lying around and the transformers were cheap, so my overall investment is pretty minimal. I've built a number of Bottlehead amps, but this is my first build from just a schematic. The casework is somewhat slapdash, as I decided to try polishing an aluminum enclosure I had lying around. I discovered that polishing aluminum is a pain, it came out a bit mediocre. In any case, I've finished up the power supply and things seem to be working well. While I absolutely hate building on perf board the heater DC is rock solid at 6V. From what I understand, without a load the HT doesn't mean much right now. The only thing I want to do is add a 200k, 2W bleeder resistor. An hour after removing power I still had 75V on the capacitors. I twisted the B+ supplies just to keep things tidy. Next I want to wire up the input, then the tubes, and finally the output transformers. The switch between the pot and headphone jack is to select impedance.