With my cans plugged into my Little Dot I+, I hear a short (~1sec) jitter/static, that repeats every 5-15 seconds or so. My cans are plugged in with no music playing (doesn't matter if the volume knob is up or all the way down). Why is this and any suggestions on how to remedy the problem?
Some trouble shooting:
-Happens with several different cans.
-Source is a Macbook Pro and also doesn't seem to be the problem, as it's fine with my other DAC/AMP. I've also shut down most other apps and turned off the wireless, and still the problem remains on the Little Dot.
-Its not the DAC (Music Streamer II), as I plugged the MSII into a different amp (Fiio E9), and no jiter/static. In fact, I still hear it when the DAC is disconnected from the Mac.
-Double-checked all plugs and connections are secure.
-Both amps are plugged into the same Monster power bar (Blackout HDP 900).
-I switched the tubes (Matched NOS Voshkod 6ZH1P-EV) back to the stock tubes (Chinese 6J1), and the problem remains; though the jitter/static is much quieter.
-Little Dot is ~14 months old.
Any help would be appreciated.