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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: RE: You would still have a ground loop. posted by jea48 on July 4, 2007 at 16:50:27:
Difficult to say without more diagnosis. First I would disconnect the preamp cables from the power amps. Then I would try the power amps in both power supply connections to see if one still hums more than the other. If, for example, it still hums in the three-wire two-circuit mode, I would suspect transformer leakage adding into the ground line instead of cancelling. It may be that a reversal of the transformer leads in one of the amps would correct this. (Don't do this with the power line, since the hot should go through the switch.) It may also be that one circuit is providing a ground loop for the other through the common ground.
If both power arrangements work with no noise when not connected to preamp, then there is probably a ground loop situation that the preamp brings when connected.
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Follow Ups
- RE: You would still have a ground loop. - Pooge 17:27:16 07/04/07 (5)
- RE: You would still have a ground loop. - jea48 07:14:55 07/05/07 (3)
- We also know that Steve's setup with two AC circuits does not hum. - Al Sekela 15:59:03 07/05/07 (2)
- Agree... - jea48 06:05:22 07/06/07 (1)
- Good experiment. - Al Sekela 13:31:32 07/06/07 (0)
- RE: You would still have a ground loop. - Pooge 17:42:55 07/04/07 (0)
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