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Old 03-16-2016, 08:34 PM
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Tubejunke Tubejunke is offline
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Join Date: Apr 2003
Location: Martinsville, VA
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Ok, I remember at some point the amphenol connector from the probe fell apart in my hand. The center conductor was not connected. I thought it was just wear and tear. So I soldered it back and that's when all the noise and having to keep the gain almost off came into play. I put a new .02mfd cap in and nothing changed even though the cap was very leaky on my Heathkit IT-28 at very low DC voltage. Finally I backed off the amphenol connector so that the center conductor wasn't contacting and everything normalized. There must be something wrong in the wiring of the probe. I will have to go through the schematic and see.
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