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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 23rd February 2012, 07:04 PM   #11
rknize is offline rknize  United States
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Just to rule out the filament regulator going out of regulation, you can measure the DC voltage at C1 and C3. If your heater supply is a tad on the low side, the amount of hum could become dependent on variations in your mains voltage.
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