I suggest you investigate the Grado as being the cause of the hum. (If you do a bit of searching, you will find that others have had hum difficulties with their Grado cartridges as well.)
Just a thought.
Just a thought.
Halo P3 Phono Hum
Running a Parasound Halo P3 and PSAudio hca-2 with Kimber Hero XLR interconnects. Phono hum is discernable at 47 volume level on the P3 and gets louder as volume goes up. I can connect 2 RCA interconnects to the phono input jacks and not connect them to the turntable and I get the hum. Leave internconnects off altogether and hum is totally gone, even at max volume. I connect cables to turntable (Pro-ject RPM6) and hum is still there. Grounding cable attached or not to preamp makes no difference. Grounding to different ground than stereo makes no difference. Hum is not present on other inputs, even at max volume.
What is going on here? This preamp is under six months old. I'm considering buying an outboard phono stage to get rid of the hum, but am unsure if that's throwing good money after bad. Thoughts from the group would be appreciated.
What is going on here? This preamp is under six months old. I'm considering buying an outboard phono stage to get rid of the hum, but am unsure if that's throwing good money after bad. Thoughts from the group would be appreciated.