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Jackson 715 tube tester help

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daveone23:
Need help with a 715 tube tester(identical to 115). The needle wont center. Meter is tested and good, caps are not shorted, has voltage 6c4 has 6.3 on filament.
What should I check and what caused the meter to center?

daveone23:
schematic:   https://bama.edebris.com/manuals/jackson/115/

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