I need an Audio Detective

How close is your DAC to your tuner?  Are you running balanced between the tuner and the preamp? Where is your antenna located?

Sounds like RF interference. 

I want to point out though that this isn't much of a problem unless you like to keep your gear warmed up.  Distance, shielded interconnects and shielded power cables are the usual solutions.

DAC and Magnum Dynalab are about a foot apart, both plugged into a PS Audio P12. The second tuner that I had the same thing happen is 4 feet away and is on a Furman power conditioner. Balanced on both Magnum and DAC unbalanced or second tuner which is a Mcintosh MR71

Erik you are right it really isn’t a problem because I don’t keep the DAC on but you will have to admit this is a head scratcher

@jr96aolcom

Is this the first time this has ever happened when both units were powered up, and you were listening to the tuner? Or have you never had a reason to power up the DAC before, when listening to your tuner?

It sounds like the DAC is emitting some RFI which is getting into the tuner circuitry. The question is, how is the DAC emitting this RFI; via audio interconnects, or AC cable? Is the RFI energy entering the tuner circuitry by each chassis being so close together? 

If I really want low noise FM reception, I have to turn off all LED lighting in my house. Most LED lighting and dimmers emit RFI which reaches into the FM and AM bands.