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I bought this, as others have done, to drive my Massdrop HD6XX. There was hum in the left channel but a few hours of just sitting there turned on cleared that up. Together they sound beautiful. I'm using stock tubes. Will look into other tubes after I get used to these. My last tube headphone amp was part of a Stax set up in the 90's and I forgot how gorgeous tubes can sound. And it looks so retro sitting next to all my digital gear.