I have noissues with noise or hum on the leven ezcept when using high impedance phones. Low impedance phones, even the 110dB Sennheiser Momerntum are quiet. I tried it with the Klipsch RF8 rated at 98dB @ 2.83V / 1m and had no hum there either. I think the hum from the Leben varies a lot with mains and tubes, since others report otherwise. But I think that is a minority. .