I have the privilege of owning a Dynakit ST-70 and I must say I'm very happy with it. Very good soundstage, clear and sweet mids and highs, and the bass is more than adequate. I listen to jazz most of the time, a little bit of classical, and this amp does justice to all types of music. This is really a classic, and I'd be a fool to let go of it.
My system: Dynaco PAS-3 preamp(the perfect partner), Rotel RCD 1070 CD player, Thorens TD160 super (soon to be upgraded to a Rega Planar 3), and the classic Epos ES14 speaker. Hail to the ST-70!!!