430011
Head-Fier
- Joined
- Jul 16, 2015
- Posts
- 97
- Likes
- 16
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.
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.