Grounding

That would not be a ground. If you want to test for a true
ground source you will need a multimeter. To get an earth
ground you would need to drive a ground rod about 3 feet into
the ground. Since you are in an apartment the center screw on
the outlet is your only option. BTW, that metal rail you are
using now is useless. You still have to check that the center
screw is grounded,sometimes they are not.

Please don't think I'm for real:-)

Specifically i am using a Denon 395 with a Ground terminal on the rear panel. I am not referring to a power cord.

What i may do is get a 10 Gal dirt filled pot and sink the wire right into it on a tent stake or something.
11-05-14: Roscoe50

The Denon 395 has a two wire power cord and plug. The power wiring inside the unit is doubled insulated and thus the unit does not require an earth ground. An earth ground could actually introduce noise into your audio system.

The earth does not possess some magical mystical power that sucks nasties from our audio systems. That is a myth.

What a fine bunch of alarmists. Faint heart n'e'r won fair maiden.

+1 to the latest comments by Mofi and Jim (Jea48), including and especially the second paragraph in Jim's post. The intent of that terminal is to allow connection of the ground wire of a turntable. It is not intended for connection to an earth ground. See the diagram on page 6 of the manual.

Regards,
-- Al