On Aug 30, 12:33 am, "Peter Andersen"
wrote:
wrote:
As I read it, there are two amplifiers, and the diode at location D718
is the zener in question. Or is D718 a part number?

That is the partnumber on the schematic (if there should be a NAD technichan
out there he would know..)

Part number, or reference designator?

The question is now: is there drawn to much current from this zener/7812
circuit or is it normal(bad bad design!). Who knows?

You could tack in a low value resistor in front of the zener and
measure it.

TM