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Rogue Cronus Magnum (hum/noise)

Any other Cronus Magnum users care to share how noisy your amp is?  I can definitely hear a bit of transformer hum/noise when close to the amp itself, and within about a foot or so I can hear hum/buzz through my speakers.  I've lived with it as it's not really noticeable when music is playing, I'm just not sure if that's normal or not for this amp?  I think I can say with certainty it's not a ground loop issue, and different tubes don't seem to effect it at all.  The noise through the speakers stays constant and does not change with volume.   I've asked Rogue and they said it's normal for little noise, but I don't know how much is normal??

The phono section also hums (a lot more, amplifying with volume), especially when the volume hits about 12o'clock, but this isn't too big of a deal for me as I use a separate phono pre.  
mj452312

Showing 4 responses by lowrider57

lowrider57's avatar
lowrider57
5,418 posts
 
What is your power situation? Do you have a dedicated AC line or are you using power conditioning? 
Some noise is normal thru the line stage, but the noise through your phonostage is not normal. All the Rogue phono sections I have heard are very quiet and my friend's Cronus is excellent with vinyl.



lowrider57's avatar
lowrider57
5,418 posts
 
Try using the amp on a different circuit not shared with appliances. 
lowrider57's avatar
lowrider57
5,418 posts
 
There was a thread regarding transformer hum in Rogue integrateds a while back.
Rogue did admit to an owner that there was a problem with a batch of transformers.

If your unit is under warranty, you definitely should send it back. And they should also address the phonostage problem.
lowrider57's avatar
lowrider57
5,418 posts
 
The OP has been experiencing transformer hum, not a problem from mains power such as a ground loop.
And removing the ground on an amp should not be used as a fix, it's a good way to diagnose a problem.
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