I've had my Lyr for about 4 months and have been mostly happy, but I'm really getting tired of the high pitched whining noise (that is not volume related, I can hear it at zero volume). Is it the stock factory tubes or do I need to consider that the unit might have a problem? I haven't really had a major issue with the hum (can mostly control with decent source level), but yeah, this whining is just ruining things for me.
I've just noticed today that there was lyr 2 released mere months after my purchase that seems to at least combat noise. If I have to, I may consider selling this one and getting a 2.
I experienced something similar (maybe the same) just the other day. First time I'd ever heard it, so it was a bit disconcerting. It was definitely present with the volume at zero. Turned out to be the tubes, or improper insertion, and it went away when I re-seated them (didn't fully extract; I think I just gently pushed them down). I use Tubemonger socket savers, but they definitely aren't the cause. Rolled the Telefunken E88CCs in shortly after, and haven't heard the whine again. I'm still not sure if it's the tubes, or just poor contact. So, you could try that, and if you have a different pair, you could try rolling those and see what happens.