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Pin 3 and 4 have no continuity so I checked pin resistance and pin 4 has none. I looked at the wiring and it looks like a resistor was changed. Here's something v4 going to v5 the tube that wont light v4 connects to pin 3 of v5 but v5 goes to v6 from the same pin 3. Shouldn't pin 4 of v5 be going to v6?
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