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TT hum

Sorry for starting my first activity with a question. I recently got VPI prime TT with Ortofon quintet black (MC).
Since day 1, it's been making background hum. I hear it even when the volume is about 20% of max, but it gets pretty loud when it's over 50%. I have Parasound halo p5 which supports MC cartridge and it's pretty new too.
TT and Pre are connected by monoprice RCA cable and separate grounding wire.
Here's what I did.

I disconnected and turned off all other equipment (TV, amp, CDP).
I simply kept power on only for TT and Pre, and connected these two as usual.
Then I evaluated hum with headphones. It's still there.
It does not happen when Pre is set to other input (CDP, when it's connected) but only happens with phono.
When TT is disconnected, no hum.It happens even when TT motor is off.
Touching anywhere of the ground wire does not affect it.
I tried switching monoprice RCA cable to something else (not a very good one though) but still happens.
What could be the problem?
sohnwh

Showing 1 response by sohnwh

sohnwh OP
1 posts
 
1. I took off ground wire between TT and pre but no change.
2. I tried different power outlets, directly to the wall, multi tabs, but made no difference.
3. Pre has 3 settings : MM, MC 47k ohm, MC 100 ohm. I tried all of them. With MM setting, I get less hum but volume's too low. With the other 2 I get same loud hum. It is now set at MC 100 ohm.

thanks for response!!

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