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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Has anyone made an audiophile grade cheater plug? posted by posbwp55@msn.com on June 30, 2007 at 15:32:14:
The ground loop injects hum if there is some source of 60 Hz voltage in the AC safety-earth wiring. If you have a complicated AC wiring scheme, try stripping it out and powering everything from a simple power strip to see if the hum goes away without the use of the cheater plug.
If there is still hum, then disconnect all interconnect cables and measure the AC voltages between component chassis and audio ground (RCA shell) points, and each of these to AC safety-earth. It is likely that one component has an offset, and breaking the internal connection of audio ground to chassis will cure the hum problem. Some audio equipment includes a "ground lift" switch to do this: it does not disconnect chassis from AC safety-earth, but breaks the tie between internal audio ground and AC safety-earth for cases like yours.
If this still fails to point to the cause or remedy the hum, consider installing isolation audio transformers in either the preamp or the power amp.
There are no cheater plugs. What you are using is a ground adapter, meant to provide a proper AC safety-earth connection in an older house with two-port AC outlets. Anyone who sold a cheater plug would be liable for major damages, and you are placing your life at risk by using an adapter as a cheater.
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Follow Ups
- What is your AC setup? - Al Sekela 14:30:40 07/01/07 (1)
- "Anyone who sold a cheater plug would be liable for major damages." Most stores in US? - Norm 06:24:47 07/06/07 (0)
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