Heya,
I've had my Lyr for about two weeks now and I noticed two issues:
1) I will turn the unit on, let it sit for 10-15 minutes (or listen to music, both apply). At around 10 minutes it will start buzzing, VERY loudly and when I wiggle the AC power cord the buzzing stops if I push the AC cord very firmly into the amp and hold it steady. If I let it go, it buzzes again. I tried different AC cords which looked to have thicker/thinner ends and all of them buzz. However, after an additional 5-10 minutes the buzz will go away entirely and never return until I start the amp up a few hours later.
2) I will randomly get a "buzz" through my headphones- how does it sound? If you've ever heard of that weird buzz through your car stereo just before a cellphone call comes in- that's the exact sound I hear. It's random. I'm not sure if the tubes are microphonic and picking up GSM cellphone transmissions near by (I live in an apartment block)?
Any suggestions? These aren't "make it or break it" issues- I'd hate to ship the Lyr back to the US and not see it for 4-6 weeks, so if possible I'd like to address the problem locally.