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Original Message
An Update
Posted by erik on June 28, 2020 at 08:17:05:
So, folks, the preamp is fairly new, just a few months old, the sockets are clean as a whistle. Just in case cleaned them a bit. The pins on the tube are also cleaned (always do that), but this particular Soviet-made ones have thin pins, and they were very wobbly in the sockets. I bend the pins slightly outward, the noise is 99% gone, lasts just for a few seconds.
Still, I think there is some problem with that particular tube, since nothing in its place before made that noise.
Thanks everybody for the feedback.