I had problems with intermittent noise with my Line 1. Turned out to be a bad tube. I would definitely check that out first before sending it in for service. Good Luck.
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Thank you very much for the replies. The problem was with the tubes. I replaced the NOS tubes with the stock tubes that came with the preamp and the problem is now gone. I can't believe the NOS tubes went bad that quickly (less than a year). It must have been a bad batch. Again, thanks for the help.