Cool! Looking at the website these look pretty simple. If you took it apart you might be able to see something obviously wrong like a disconnected ground or something. Also, the channels are split -- 3 tubes per channel, so do you have any blown tubes? If so i'd replace them (really easy), you can get them online from a place like tubedepot. You don't have to worry about matching the tube bias (from their website) -- so any tube will do as long as it's the same size. I don't actually think a blown tube should totally eliminate the sound though, just make it sound bad, but you never know and you'd want to replace it anyway.
So how does this thing sound? Looks awesome!
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