In Reply to: RE: HK Citation V posted by sony6060 on April 29, 2021 at 11:30:29:
That is my guess also. Heater to Cathode leakage results in hum when the filament is heated with AC. Lower Cathode temperature would reduce it.
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Follow Ups
- RE: HK Citation V - Alpha Al 13:07:35 04/29/21 (0)