Oh, I have the manual, Avionic.
This is my first separate power amp (I have a few integrateds), so excuse my ignorance if this grounding scheme is typical in separates world. But, it's just had me scratching my head since I saw it. If the amp wants an earth ground, why isn't it equipped with a 3 prong cord?
So, I was wondering, is the earth connection optional (i.e., intended for sonics only), or is there also a safety component to it?
I detect no noise coming from my speakers when the amp is idle.
...and where would I attach it? The preamp I built could easily be fitted with a ground connection I guess (I designed it with a 3 prong cord as I do all my projects). But, from the schematic in that manual, it seems the Yamaha preamp wouldn't even have a place to connect an earth ground.
Is it me, or is this weird?