2. amps-preamps
  3. 162488-154845

Diy helph

Hi,
Ive just put together an amp / preamp combo. Every thing sounds great but it has an audible hum when the amps input cables are connected to the preamps outs, the hum is not effected with the volume, its a set volume.
The weird thing is if i connect either a left or right channel only via the cable theres no hum?
Its only when both channels are connected.
Anyone got any ideas?
Regards
Mike
milo66
fuzztone's avatar
fuzztone
5,636 posts
 
Nice one roxy54
All you can do is try every combo and it still might not go away. Move the pieces and IC around. I have a bag of iso transformers I try..
Start with in between.
Lotso luck.
milo66 OP
3 posts
 
Thanks for the info , I'm trying to eliminate an earth loop at the moment , rerouting the input leads inside amp to one side.
The title of this thread was a typo but I couldn't edit it for some reason.
Cheers
Mike
erik_squires
16,404 posts
 
Hey!

Always try the DIYaudio forums.
imhififan's avatar
imhififan
2,217 posts
 
Ive just put together an amp / preamp combo.
Those are DIY amp and preamp?
cal3713's avatar
cal3713
1,421 posts
 
Agreed with @erik_squires that diyaudio is likely to be of more help with this issue.

Perhaps this thread is somewhere to start: https://www.diyaudio.com/forums/diyaudio-com-articles/163575-audio-component-grounding-interconnecti...

When dealing with ground loops it can be useful to just unplug everything and try to eliminate possible sources. Do you have to same issue if the pre is taken out of the loop? Do you have equipment plugged into multiple outlets? 

Good luck, ground loops can be a bitch...
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