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If that's an isolation brightener and not just 'brightener', there's a chance it was installed due to a heater-cathode short. In any case, you need a decent tester to be sure what you got.
[EDIT.] If the britener has a switch, what position was it in?
Last edited by old_coot88; 05-06-2024 at 02:56 PM.
Reason: as
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