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In Reply to: hum from new tube posted by scruffy_ on February 7, 2017 at 14:46:30:
That's why some circuits use DC for heaters. It eliminates the hum, but requires some circuit re-design it implement it if not designed that way.
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Follow Ups
- Heater to Cathode leakage - Alpha Al 10:35:43 02/08/17 (0)