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Have you checked 47 ohm resistor R100? If it's open, it would blow up C3.
What's the AC voltage at the plates of the 5U4 (measured from ground)?
OOPs! Scratch that. I forgot the 5U4 is mounted on top of the power xfmr. And you probably don't have a Pomona adapter.
Last edited by old_coot88; 05-05-2016 at 10:44 PM.
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