@odysseebooks - A question - does your system contain components that came with both 2 pin plugs and three pin plugs on the stock power cables?
Over the years I have oswned many Two-pin (or double insulated) components
More often than not they were "responsible" for unwanted hum from my amp, which has a three pin plug
My solution (rightly or wrongly) is to ground the NEUTRAL SIDE ONLY of an unused input socket on the AMP to a single ground point
- E.G. I simply use a piece of wire attached to the neutral side of an RCA jack at one end and connect the other end to the ground pin of a mains plug and plug it into a GROUNDED mains outlet
- NOTE if your amp has a "grounding terminal" (e.g. for turntable grounding) that can also be used in place of the Mains plug
As an example - On my current system
- I have
- a bluesound Node 2 (2 pin plug) streamer
- a Simaudio Moon (3 pin plug) Phono stage
- a Bryston B135 integrated amp (3 pin plug)
- There is NO HUM when both sources are connected to the amp
- because the phono stage is a "grounded component" with a three pin plug
- if I disconnct the phono stage but leave the Node 2 connected it causes the amp to hum
- attaching a grounding lead as described above eliminates the hum
I searched for several years and tried many solutions for this type of hum and the grounding lead is the only thing that worked
I would certainly NOT consider a power cable with a removeable ground pin. The pin is there for a very important reason - TO SAVE LIVES
Regards - Steve