Have a Defy mk3 giving the juice to an older pair off watt/pups.......big, fat, poweful bass...but not super tight.The highs are not hot. Just had my amp retubed andtuned up by Jadis Guru Tech Da Hong Seeto in NY. Service is doable.....very reliable amp so far. Mk 3 and after is what you want. Bigger, better transformer. Mk3 transformer is SAME depth as outside transformers...earlier versions center one is smaller. Amp is Very gutsy and breathes life into my Quad esls as well as the watt/pups. For the money used mk3s sell for....a very fine value.
dan
dan