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
5,600 posts
 
Headache.
petg60
1,486 posts
 
Nice one fuzztone, 
assuming that your connection is with rca's then most propably a ground is touching signal. Have you checked both cables or just one? What happens if you rock the rca's at pre's output or power's input while both cables are connected? Unscrew top covers-units off mains- and check that rca's at both units have a tight fit.
You can use a voltmeter to check any kind of shorting if you wish.
G
roxy54's avatar
roxy54
7,986 posts
 
At first I thought that the title of the thread was in a different language.
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