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I decided to do the "Fitz mod" on my humming DarkVoice. For the sum of £2.15 I bought two 220uf 35v Nichicon capacitors, soldered them in place, and, NO HUM. Completely gone. Why this is not done in the factory I don't know but I am happy with the DV now and making use of my Foton factory 1961 vintage 6SN7 valves.