I need an Audio Detective

Preamp is a Mcintosh C1100

Love my tuners got into in a big way a few years ago

Magnum Dynalab MD108t SE

Mcintosh MR71 fully restoted

Mcintosh MR 78 with RM mods

Tandberg 3001 A

I was playing music with a strong 9 on signal strength meter and no multipath. Cut DAC on and signal goes to around 3 and just noise like between channels. Cut DAC off signal is restored to a 9 and music comes back on clear as a bell. That’s what I was referring to with crushing the signal

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

Coop. Yes first time and quite by accident 

I hate spell check dpop 

Antenna is on the roof. I have 4 tuners with a quick disconnect I have set up so I don’t weaken my signal by having all 4 on a splitter. I only have 1 at a time. I am beginning to believe it is an RF issue being picked up by cabling. I am going to try this with my other 2 tuners tonight to see if the same thing happens

Follow up all 4 of my tuners are behaving in the same way and the other two are on the left side of preamp nowhere near the DAC and it’s interconnects or power cable. The interconnects only get close where they connect to preamp. Thanks for all your thoughts. Like I said not really a problem I don,t leave DAC on but the curiosity factor was quite interesting 

I have the ddc Gaia hooked up to the Denafrips and it is always on. The units are behind glass doors(open completely in the back) and I cut it off for heat reasons. I have left on for weeks at a time and cut it off I cannot tell any sonic difference either way.