i purchased a yamaha rxv 685 in june and the receiver has been for quite a few
weeks giving electric shocks from all the screws on the body.
is it normal or is it a faulty unit with some short.i have connected it from a stabilizer which in turn is connected to a belkin surge
protector.i also connected directly to the belkin but still when i use a tester on the screws it lights up.
I suspect that the unit is faulty, or that somehow your live and neutral lines have got switched.
First plug the unit into an AC outlet that you have tested to make sure that outlet is wired correctly. If there is still voltage on those screws then that unit is faulty, and is dangerous and should be taken out of service and returned immediately.
If there are no shocks when the unit is plugged in without those other two units, then you need to check those other two units to make sure one of them is not reversing the live and neutral. If one is then discard it.
If they all check out, then disconnect that stabilizer and see if that cures it. If it does then get rid of that stabilizer. You did not mention what it was, but many of those type of units are bogus and even dangerous. I have some personal horror stories of those sort of units I have been asked to see. I am also not a fan of those plug in surge protectors either in audio equipment installations. Very few of them actually provide any useful protection.