Tube Preamp Got a Hissy Channel

Amp/Preamp Asylum

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Guys, bought this Chinese/German Vincent sa-t7 preamp about 10 months ago, and a few days back after the warm up the left channel started to make a weird distorted thumping noise, which turned into a permanent loud hiss. Just the left channel. The volume level doesn't affect the noise. I already tried a different power amp and preamp, so the problem is the pre, and it's not tube-related (switched the channels, tried a new set of tubes).
Going to ship it to Audio Advisor under their warranty, but still very curious what that could be.
Any ideas? Appreciate your feedback.

Edits: 12/24/20

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Topic - Tube Preamp Got a Hissy Channel - erik 15:32:19 12/24/20 (10)

You can try - airtime 06:33:32 12/25/20 (2)

RE: You can try - erik 08:25:20 12/25/20 (1)

RE: You can try - airtime 16:10:31 12/25/20 (0)

RE: Tube Preamp Got a Hissy Channel - JURB 17:14:11 12/24/20 (3)

"Switch the tubes channel to channel" - mlsstl 18:29:44 12/24/20 (2)

RE: "Switch the tubes channel to channel" - JURB 23:41:50 12/24/20 (1)

I often "leap before I look"... - Jonesy 08:19:40 12/27/20 (0)

FWIW, I found AA to be very good about warranty - LtMandella 17:03:54 12/24/20 (0)

First thing that popped into my mind... - mlsstl 16:30:29 12/24/20 (1)

RE: First thing that popped into my mind... - pictureguy 22:15:33 12/24/20 (0)

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