My Impossible hum issue.

More to the point, you might contact Pangea or your vendor and ask for a return authorization, on the basis that their ICs seem to have an internal short circuit on the ground side. By "internal" I mean that the issue probably is inside the insulating sheath or outer cover OR it's at one end where the wire is soldered to the ground side of an RCA plug. (It's unlikely to have been a problem with an AC cord; in that case you would have no power to the TT.)

I noticed you're using the same preamp I have (Parasound P6).  I have likely missed other messages prior to those I just scanned.  Tell me, did you try simply using the phono stage in the P6 rather than your separate phono amp?  No compelling reason to I suppose but that's likely an easy check.

I have no reason to be optimistic but the head shell comment may have merit.

Best of luck.

Yes, I did connect the turntable directly to the Parasound P 6 with the same result. When going back to the turntable's stock cables, the hum stopped. Now I need to find some quality phono cables that don't cause a hum

Any suggestions for a phono cable at $100 level?

Congratulations to the OP on solving the problem.  I am going to commit audiophile heresy and suggest that he leave well enough alone and go with the stock cables.  Perhaps he can do research into the company that makes the stock cables and see if they offer higher end cables that use the same basic design.

  I am curious as to why the hum is worse with mc cartridges.

In my case, the hum increased with a higher gain setting. On my phono preamp  the choices are 40, 50 and 60. The MC cartridge that I have has a lower output than my MM, thus needing more gain. When I would switch the gain, the hum increased