Tube PHONO preamp interference - RFI, EMI, bad grounding?

Would you suggest trying to move resistor between the audio and the ground plug? While chassis > IEC would be connected directly.

I’ll have to buy a new one. Will this work? - MBB02070C3329FCT00 (serial number of the resistor) - It was a Vishay dale, 33.2 ohm.

The resistor says "33R2F RN60P 9322J DALE"

I think the noise is air borne. Everything I have tried suggests it is, and yes, the chassis definitely acts as an antenna.

It simply cannot be in the AC because we have powered the EAR with a battery. The noise stayed the same.

Thank you

Or I could leave the resistor where it is and try to ground it through the ground plug on the chassis. What would be the most effective way to do it? Connecting a ground wire to a line stage chassis doesn’t work at all.

If the proper grounding won’t help I’ll sell the unit. It worked everywhere else. I’d be looking for an ARC PH5 which should be better anyways.

@filipm

Would you suggest trying to move resistor between the audio and the ground plug? While chassis > IEC would be connected directly.

Yes I was going to suggest that. Run a wire from IEC earth to ground post, and then 33 ohm resistor from ground post to board.

Then just measure resistance between chassis and IEC earth pin - hopefully should read 0.

If it still measures 33 ohms between chassis and IEC earth pin that would mean that the chassis is connected to the board somewhere else other than the ground post.

Glad you are still with us - its worth getting the grounding sorted.

Good luck.

Hello again,

I have sold the EAR phono preamp few weeks ago. It was replaced with RCM sensor 2 phono stage (solid state).

It's a different story when it comes to the sound, there quite typical differences as in other tube vs. solid state comparisons. I'm very happy with the sound overall. 

Anyways, the phono works well when plugged into unbalanced mode.

I have just brought XLR cables to try the balanced mode and I get a ground loop.

The volume of the loop depends on the RCA cables used between TT and the phono stage. 

I have tried XLR cables with shortning plugs and the interesting thing is I get a loop only from the left channel. 

When I remove the plugs and leave the input without any connection, the loop is still there - not as loud though. It gets a little louder when I remove the TT ground cable. 

Any suggestion what to do? I'd like to use the balanced output of the phono, even with the loop I can tell it sounds better. 

Dover, You wrote, directed at me, "There is 230 volts floating around - you should be more careful if you are going to give advice on this forum."  Your advice directed at me is good advice for all of us.  However, I don't see where I advised any action on the part of the OP; I was merely trying to make sense of the written and pictured information, and I wrote here what I thought was true based on that information only. 

Filip, I just read a few reviews of your new phono stage.  It is interesting to me that it claims to be balanced but offers only SE inputs (the claim is you can feed the RCA jacks in balanced mode or in SE mode), although it does have both SE and balanced outputs. Before consulting us usual suspects, why not ask your dealer or better yet the maker of the product? One question: Are you feeding the stage in balanced mode using SE cables?

The chain is TT - RCA / single ended, shielded with separate ground wire -> RCM phono -> XLR out -> preamp

Could the problem be in the TT grounding?

The whole system is plugged into one wall outlet. 

Power amp plugged directly into the wall and the rest is on a unfiltered power strip.