Thread: Dumont RA-103
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  #15  
Old 09-30-2020, 08:08 AM
Tom9589 Tom9589 is offline
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Location: Stone Mountain, GA
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Check the voltage on Pin 9 of the CRT while you vary the brightness control. If it doesn't vary, you might have a heater-to-cathode short in the CRT. An isolation transformer (looks like a CRT brightener) can cure that problem.
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