This has been rolling around in my head for a few days...Maybe I am over analyzing this.
I have a Pre Amp with a built in phono stage but also have a stand alone Phono pre amp which I much prefer to use. The Phono Pre Amp gets its power from the wall wort with 2 prongs. This means to me that having only 2 prongs it is not grounded like a 3 prong plug. Still want to use my Phono amp but should I be plugging the ground wire from the turntable into the ground in the Phono amp or the ground plug on the Pre amp. The pre amp is 3 pronged and obviously is grounded.
Like I said...maybe I am over thinking this.
Thanks
Short answer: Choose a grounding point and if you don't have any buzz, hum or rumble, then you are fine.
Long Answer:
Ground is ground is ground......assuming that they are all grounded properly.
You seem to also be confusing "safety ground" vs. "circuit ground (i.e. circuit common)"
That 3rd prong you refer to is the safety ground.....get this...it's a safety feature.
The "circuit ground" is really better described as the "circuit common", or perhaps the "neutral" line.
Back at the breaker box, the neutral line should be tied to the ground by a long grounding rod driven into the ground. So, a 2-prong plug is grounded, but the cxn to ground is back at the service entry point. The safety ground 3rd prong is there to hopefully short any lethal electricity to ground much closer to the problem if something were to malfunction.
