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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: help with ella hum posted by tokyofist on March 15, 2006 at 18:42:23:
You could try going about it in the opposite direction. The ground is supposed to come in from the RCAs through the vol control, at the tubes it goes to the ground bus and then via the PCB/chassis mounting to the case and then out via the IEC. If you are getting a ground hum you probably have an extra grounding somewhere.You could test this by disconnecting one of these. For example, undo the power supply PCB from the chassis. There should now be no ground between the RCA in and the IEC out. If so then make sure that only one of the PCB mounting screws is actually grounding - there should be a plastic washer on the other to isolate it.
If you still had RCA-IEC ground then try disconnecting the yellow wire at "S" to the ground bus. Still have RCA-IEC? Then the ground must be in the RCA-vol control section, otherwise it was somewhere around the tubes. And so on.
Good luck. Take heart too - it will be worth it in the end!
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Follow Ups
- Re: help with ella hum - Graham 19:51:41 03/25/06 (0)
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