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Anyone with experience with the effectiveness of the AVA HUMDINGER?

Just got a new amp -- Rogue ST 100 -- and have transformer hum.  First time ever in my system.  The factory says something about DC voltage on the incoming AC line.  My son the electrician says he has never heard of that happening.  He says we switched from Edison to Tesla a few years back. 

Anyway, I have tried all kinds of things to see if I could eliminate/reduce it  to no avail:  different circuits, disconnect everything else from the system (other than speakers)  disconnected the powered woofers in my speakers and the subwoofer, tightened the bolts holding the transformer down,  etc. etc.

So maybe the Humdinger is worth a try??   Some other way to handle it (other than a new transformer which the factory says it will do if its really the transformer)?.  Anyone with experience with any other solution?  Thanks for your help..  Regards,  Rich
drrnc2
jbrrp1
423 posts
 
I tried one on their 30 day home trial basis, but it didn't completely remove the transformer hum I was getting with some monoblock amps, so I returned it.  Since it is a money back proposition, you only risk shipping costs to try it.

FYI, DC definitely can ride on the AC line.  It saturates the transformers and makes some hum pretty badly at times.  My power has had this issue all along, so I have had to select gear that doesn't resonate with this problem.  I am guessing that my situation might be on the more extreme side.

I researched and found plenty of folks that found the Humdinger to be useful, so I'd say give it a whirl.  
bdp24's avatar
bdp24
9,412 posts
 
Emotiva makes a product similar to the Humdinger. Both are designed to rid the line of DC offset, I believe.
lowrider57's avatar
lowrider57
5,393 posts
 
Try it or the Emotiva and if you still have hum, then return the amp under warranty. FYI, in the past, Rogue has installed some bad toroidal transformers in their amps.
ebm
9,311 posts
 
Sounds like a great product however i have no hum in my system.

drrnc2 OP
29 posts
 
Thanks all for your responses.  I have learned some things.  Right now, I plan to take the amp to the dealer and see if it hums in his set up.  Interestingly, I took the ST 100 out of my system and put an ST 90 (the model previous to the ST 100) in its place---and NO HUM.  Suggests to me its not dirty power, but more likely a bad transformer.  I assume the dealer will hear the hum also and then it will be off to the factory for repair.

Regards,  Rich
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