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Got mine. Super happy with this purchase. No hum with stock tubes, but definitely had a seriously audible hum when I rolled in a Northern Electric 6SN7 tube. I took out the 6AS7 & burnt in the new 6SN7 tube for 48 hours - no more hum. Currently using an NOS Tung-Sol circa 1954, & had no hum at all with that one.