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Dx9 Hum

Well after all this messing around I finally fixed the hum.
Member I removed earth temporally.
That didn't work.
So today i used a70 pro.

Dx9 to a70 preamp then out to 9000p
Lifted the ground switch on a70 pro.
Hallelujah....
No more dx noise

Strange that removing earth from dx and amp didn't work.
And yet a70 ground lift did.

I could have used cxa80 pre out that worked too.
I couldn't see the wood for the trees.
 
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