After going through four design iterations, the highest being the Mk. IV, the Defy 7 morphed into the DA-7 in 2004. This a considerably different amplifier from the original product, with a different circuit board, different capacitors and resistors, and a larger center power transformer that matches the size of the two flanking output transformers. Even the gold plate on the front of the amp has been upgraded to match the look of the other units in the Jadis line. The DA-7 also offers the first opportunity to use KT-88 tubes with the amp.