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Old 8th June 2014, 06:58 PM   #1
nikon f is offline nikon f  United States
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Default Grounding Qustion?

I was given a pair of Ampex 6973 mono block amplifiers. Should I install a three prong AC cord that grounds off the chassis or stick with a two prong cord?
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Old 8th June 2014, 07:09 PM   #2
okcrum is offline okcrum  United States
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Install three conductor power cables and ground to the chassis. If there are caps to ground on the AC primary, remove or replace with AC safe caps (they fail open).
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Old 8th June 2014, 08:13 PM   #3
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Always best to have the chassis at ground potential. If you get hum issues, use a 10R 2W5 resistor (that has a 1nF cap and back to back 1N5401 diodes across it) in series with the Earth conductor in the chassis end, that will ensure coupling for safety to ground but allow for earth loops.
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Old 8th June 2014, 09:02 PM   #4
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Quote:
Originally Posted by JonSnell Electronic View Post
Always best to have the chassis at ground potential. If you get hum issues, use a 10R 2W5 resistor (that has a 1nF cap and back to back 1N5401 diodes across it) in series with the Earth conductor in the chassis end, that will ensure coupling for safety to ground but allow for earth loops.
Would those 3A diodes be enough for fault currents? Maybe I went overkill but I think I used a 30A bridge
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