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Old 19th September 2014, 05:33 PM   #1
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Default tubelab se output tube filament voltage varies

During checkout with no tubes installed I measure the output tube filament voltage at 2.5 V but then shortly it changes to 1.8 V. Please help
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Old 29th September 2014, 10:27 AM   #2
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What is the voltage on the other taps? (input and output)
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