@isaacc7 Glad you were able to eliminate the noise. I recently used a Dremel, with soft buffing wheel, to clean all the tube pins for my Don Sachs linestage and VTL ST150 amp. A huge improvement with the old stock tubes in the linestage. Much sweeter and purer high frequencies. The VTL tubes are only ~5 years old, and there wasn't as much improvement.
Thanks,
aldnorab