Thats true but say we look at it this way; how many of us have a scope and are experienced enough to use it? The possibility of driving the amp into oscillation is very real with the CCS; more so than with a resistor load, is that correct? Also you should not have to build a business; unless of course you want to, but there should be someway to have the design etched for each individual as they choose. The etched design would be applicable to more than one circuit is that right?