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McIntosh hum problem

Any of you MAC people own a MCD 751 CD Transport and MDA 700 D/A Converter combo? I do and both hum, wondered if any others with same problem? The converter hums louder and MAC gave me a new power transformer for it, but did not help. The hum is from the units themselves vs. speaker hum. Any way to reduce the hum. Any advice appreciated.
amwarwick
ljgj
955 posts
 
Do they still hum when plugged into another outlet in another room? Have you tried cheater plugs on the units? Is your cable TV near these units?
imperial
1 posts
 
It is ground noisy, Try use ground lift outlet(amp,D/A)
you can find at home depot or hardware store.
It is gray color , about fifty cents each. -good luck-
amwarwick OP
40 posts
 
Ligi,
I tried different outlets, cheater plugs and no change. Units are in a different room well away from cable TV. Seems to be a problem with noisy power transformers. Thanks to all for your advice.
ljgj
955 posts
 
Those transformers should not be that loud. You need service as a problem prior to the transformer hooup may be creating the noise.
amwarwick OP
40 posts
 
Thanks Ligi for the advice !
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