Any advice on darn ground hum?

[continental55]

  hello I got my amp rebuilt on my regis but he put in rca inputs on the amp
instead of the round plug.
  so I run positive left right  to the amp plug but if i common the 2 ground wires at tonearm does it matter where on the amp I attach the ground wire?
  I think amp was ceramic so would that give less hum issues?

thanks

[jukenorman]

No it shouldn't - provided the neg of both RCA sockets are connected to ground. I don't think there's any technical reason why a ceramic cartridge produces less hum.

Norman.