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I can confirm that this product did not come with a warranty, mine showed up, the left channel was nothing but static with smoke coming out of the rear of the unit. The only option is to return and wait for refund.
I would try a different set of tubes. The left hum resolves itself with burn in (most folks say 72 hours), and the smoking is normal (will resolve in about 1-2 hours of running).
The problem is that it wasn’t a hum, it was just static with no sound coming through the left channel.