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  1. S

    Mark 5:35 Loud hum on both channels

    I received my replacement tubes yesterday. The problem was resurfacing intermittently for a few days, then on a whim, I changed to a different electrical outlet. The wiring for that outlet is old 12 gauge with no ground. I did add a ground to that outlet a couple years ago, but it’s somewhat...
  2. S

    Mark 5:35 Loud hum on both channels

    I hadn't used my amp in several months and played it tonight. It worked fine at a low volume for an hour or so, and then I heard a sporadic crackling coming from the speaker, which suddenly became a loud hum. The sound is only affected by changing the wattage (10W-25W-35W), in which case it gets...
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