Schematics!

So after a long time, the design was set and the schematics completed. All the work was done in Cadsoft's Eagle, and uses a lot of custom library components just to make sure the PCBs don't have any mistakes.

The unit follows the above diagram, with all inputs being THAT 1200 series ICs and most of the outputs being THAT 1646 ICs. As the majority of the unit is designed to be clean and quiet, these seemed the best option without taking up too much PCB space or cost. The outputs that aren't using the THAT chips are from the main gain stage, which have the option of either the above chips or lovely API 2503 output transformers. The mix amps use DOAs to further increase the flexibility. For this unit I will be using a John Hardy 990c and THAT 1646 combo for the 'modern' bus, and a GAR 2520 paired to a Classic API 2503 transformer for the 'vintage' bus.

Full schematics are available here:
HYDRA Full Schematics