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I checked C2 again. Still not finding an error.
Is there a specific section of C2 I should be looking at?
I did a few measurements by the way. I noticed my HV is hoving around 12KV when it's listed as being between 15 and 18KV. Also, my 670V boost voltage coming off of pin 3 on the flyback is measuring around 650V. Not sure if any of that could be related, but maybe that's a clue?
I tightened the core a bit. Ringing is gone, at least so far.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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