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
roxy54's avatar
roxy54
7,934 posts
 
At first I thought that the title of the thread was in a different language.
rdk777's avatar
rdk777
570 posts
 
Have you tried interchanging the cables? I had a situation where one of my cables potentially had damaged shielding and would catch radio interference when connected to my turntable.
tomstruck's avatar
tomstruck
350 posts
 
have you try a ferrite ring on power cord of preamp and or amp close to the unit
fuzztone's avatar
fuzztone
5,543 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
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