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I've had mine for a couple of weeks now and aside from the blue power LED fluttering and finally going out altogether after a week or so it has been working beautifully. I bought some replacement tubes from various sources including eBay and have been really enjoying this amp with my Senn 650 and AKG K701 and K7xxx. I even listened to my Oppo PM1s with this amp and every phone has sounded wonderful. Only one tube I bought caused a loud HUMMMMM and it was a new 6sny tube from Northern Audio of Canada. I don't know why the amp doesn't like that one tube. All the others, NOS and old even with rusty looking pins, have played fine in the amp. No hiss, no hum.
What tubes did you get? So far I got to pairs and ther is always audible hum.