2. amps-preamps
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Audible Hum From Integrated Amp

I am getting a low volume but audible hum from my Rogue Sphinx. I also hear volume changes through the speakers ( with no music source of course). I have tried other amplifiers in the system, no hum. Any suggestions on what I might do to eliminate this fairly minor but annoying problem? Thanks .

mysterioso1
mysterioso1 OP
29 posts
 

Jerry - Thanks...The hum is audible from 10 ft away at 10:00 volume. This is a tube pre amp w/Class D power. I have changed the pre amp tubes with no change  I have no unused inputs...all tied up..

carlsbad2's avatar
carlsbad2
1,380 posts
 

Hmmm.  Then I like Erik's advice.

mysterioso1 OP
29 posts
 

I think I'll call Rogue tomorrow..it's not a new unit, so I don't expect much, but who knows. Is it worth replacing the power cord? I'm using the stock cord that came with the unit.

erik_squires
15,784 posts
 

Wait, to be clear, do you mean, the hum volume changes based on the volume control, or do you hear the volume control moving, like scratching, when you adjust it?  The latter points to having a DC voltage where there should not be any.

A humm that you hear changing in volume points to an upstream issue.

mysterioso1 OP
29 posts
 

Erik - I hear the volume control moving when I adjust it. Scratching , as you said, or ticking is a good description.

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