Went from brilliant to distortion


I'm wishing for a spare phono preamp. 

I recently purchased a Rega P10. My wife and I have been amazed at the amount of information this table draws out of our old vinyl collection. On well recorded vinyl it's jaw dropping. I couldn't be more pleased witrh the P10's performance.

Now all of a sudden my music is distorted. Distortion in the form of noise surrounding the music. It's bad. Unlistenable. 
I had a made a change in that my Rogue Audio Ares formally fed my Lindemann Musicbook DSD used as a preamp to feed my amplifers and it all worked brilliantly. A few days ago I built a system in our den stealing the Lindemann and using our NAD M17/V2 as a preamp instead. That's when music went south. I thought that odd as the NAD is performing well in its own domain, as a digital streamer and SSP. 

I checked the tubes on the Ares but noted that both channels are distorted. Can't have 2 tube failures identically in left right channels right? OK, maybe the analog input on the NAD went south so I moved to another analog in to no help. Well, it was working perfectly through the Lindemann so I carried my vinyl setup to the den and reconnected to the Lindemann. Same distortion. 

Unless I'm missing something this leaves a problem with the Rogue Ares not related to a tube or a problem with the Apheta 3 cartridge which is nearly new. 

Anyone have an insight?
Thanks
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Is your stylus clean? 
Stylus is perfectly clean. First place I looked. It actually sounds like an extremely dirty stylus. 
Sounds like something is overloading the NAD.
Recheck your cabling and inputs/outputs. If it was me, I'd put everything back the way it was in the P10 system and see what happens. You are playing with too many variables. Ensure tubes are seated fully.
Yes,  had everything back to original.

I located a pair of JJ ECC802-S tubes and replaced the 12AX7LPS Sovteks out of the rearward position of the L/R channels of the Ares. 

No more noise! No electronics expert here but I know (or I think I know) that 1 tube failure can effect both channels - it seems.

As I recall, the JJ's needed a lot of gain to get the system going.

Thanks guys for you help!