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21. [Amps] 120 cycle hum from Henry 2K-4 (score: 1): Author: johndtate@post.com; Date: Wed, 03 Mar 2010 13:45:23 -0500; Update to the Henry Hum. Much of the hum was magnetic pickup and moving things and better grounding solved that. It was another operator that first said "That's 120 cycle hum". I don't think it was.; /archives//html/Amps/2010-03/msg00068.html (6,823 bytes)
22. Re: [Amps] 120 cycle hum from Henry 2K-4 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 04 Mar 2010 08:43:56 -0800; Clarification. I can believe magnetic coupling as the cause of 60 Hz hum, but a connection to EARTH has NOTHING to do with magnetic coupling. Magnetic coupling requires a loop for current that couple; /archives//html/Amps/2010-03/msg00074.html (7,675 bytes)

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