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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
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.



dave_b's avatar
dave_b
3,159 posts
 
Rogue Audio offers cheaply built products with bad grounding schemes.  My brother and I have tried there products and found similar issues and in some cases worse.  Personally I don't believe even cheaply built products should have Hum or obvious noise.  I owned a tube buffer from the far east that was quiet as a mouse and had an extremely low noise floor...cost was just over $200.
smrex13
645 posts
 
I had a bad experience with a Sphinx, and I've heard others with similar problems.  The measurements on one of their amps in Stereophile showed some noise problems, too.  Some people love them, but I'm not taking another chance with Rogue.

xti16
1,525 posts
 
When I owned an Octave V70se and later a V110 there was absolutely no transformer hum or anything through the speakers at any volume. I did have a Naim XP5XS power supply that had a transformer but nothing through the speakers.
donjr
1,335 posts
 
I owned a Cronus Magnum for three years and had no hum. I have a dedicated circuit which I'm sure helped. I really liked that amp a lot.
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