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1. [Amps] re Reduction of 50hz hum via metal plate (score: 1): Author: vk3ym at iprimus.com.au (RICK COLE); Date: Fri Jun 27 08:16:43 2003; Can some-one give me a short explanation WHY a piece of METAL should improve the hum...I have 50hz mains power here in Australia and never seen this here in any of the amps i have looked at...I have; /archives//html/Amps/2003-06/msg00222.html (9,331 bytes)
2. [Amps] re Reduction of 50hz hum via metal plate (score: 1): Author: vic at rakefet.com (Vic Rosenthal); Date: Sat Jun 28 08:31:45 2003; Perhaps it stiffens the chassis, reducing the soundboard effect. Or increases the mass of that part of the chassis, causing a change in its resonant frequency. Since aluminium was specified, maybe th; /archives//html/Amps/2003-06/msg00231.html (7,362 bytes)
3. [Amps] re Reduction of 50hz hum via metal plate (score: 1): Author: nagato at arnet.com.ar (GGLL); Date: Sat Jun 28 08:31:57 2003; I don't figure why, but (here we also have 50 Hz line frequency) with many transformers we have hum, adding a thick (1.5 mm) carton between transformer and chassis completely solve the problem; in ex; /archives//html/Amps/2003-06/msg00233.html (10,557 bytes)
4. [Amps] re Reduction of 50hz hum via metal plate (score: 1): Author: kh6jj at mobettah.net (Merv Schweigert); Date: Sun Jun 29 09:37:10 2003; Probably any material that spaces the magnetic field of the transformer away from coupling into the steel chassis would work, aluminum being non ferrous should work as well as a carton, and stronger; /archives//html/Amps/2003-06/msg00234.html (7,517 bytes)

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