I know the basic differences between different designs and what they do but I could use a quick technological explanation from someone with the cold facts. What makes a piece of gear Class A, what requirements does it have to live up to ? And Class AB ? Class B ? Is solid-state simply a design without tubes ? Discrete is point-to-point-wired with no IC's or...? For example the 1073 is discrete and Class A but the 1081 contains Class B electronics, what´s the major difference ? And then I read an interview with a designer talking about "REAL Class A"-stuff, not just Class A. Could someone straighten this out for me once and for all, thanx.