A reminder that I have a small number of DSHA-1 prototypes available. Circuit wise, these are virtually identical to the production version. The differences being that these run at about 75% the current of the production version, and they use the LL1544a input transformer rather than the LL1674. Both transformers are high quality, amorphous core Lundahls. The difference between them is that the 1544 is a 1:1 or 1:2 step up while the 1674 is a 1:2 or 1:4, and the level handling of the 1544 is a bit lower, so with a very hot source (Meridian), you can clip them in the extreme bass. That all means that the protos won't go quite as loud. Subjectively, they feel like they have a little less bass weight. However, they represent about 95% of the performance for much less money. They do quite well with both Grado and Sennheisers, and are what I use for general listening.
These are $925 shipped in the US. Each comes with the AC wall wart power supply and a balanced to TRS adapter for using unbalanced headphones.