Originally Posted by jaycalgary
It won't be until summer till I get to see or hear them but I will be looking for a great amp to go with them. 306 may be too powerful and need the clamp boards in for the treble? I recall asking about buying a Classe Dr2 a while back and someone with experience said don't bother and that a Quad 405 up to spec would be better.
The 306 was designed to drive electrostatics (primarily the ESL63), and is, in many ways, a modern interpretation of the 405 concept, sharing its "current dumping" circuit topology. I don't know how much of its circuit is derived from the 405, but I presume quite a bit of it must be a straight carry-over. It does, however, sound a little more transparent and incisive.
Even a 306 is likely to be quite an old amp now, though, so please check the PSU caps before powering up connected to the ESLs!