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It is a hum, you do hear some noise changes depending on the picture being shown, but my audio is distorted as well, the sound actually resembles that of an old radio with bad filters, but I have double checked them, as well as re replacing all of the NOS capacitors I put in there years ago with new ones. The old rectifiers have been replaced with diodes. I double checked all of the tubes again, I had already replaced several tubes, I did find another that develops cathode to grid leakage after a long warm up 12DQ6B, but it is not the source of my trouble either.
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