[lb-v]

Hello.  Just joined, but been lurking for a while.  I have, what I believe, is a ground loop issue of some sort in my system (main pieces - T8+ and Synergy Double 300).  I have exhausted my practical troublshooting expertise, and I believe I have worn out Mr. Van Alstine with my inquiries and exchanges.  He and the AVA team have been quite remarkable in their support.   I do not believe a person could get better support in any industry.

Are there any AVA gear folks out there in the Houston, TX (specifically Sugar Land) area that might be willing to help out or perhaps have a reference of somebody that can?

Any help would be appreciate.

Thank you,

Vincent

[iamjaymo]

Did Frank recommend the Humdinger? Maybe that will correct it.

[avahifi]

Vincent, one more thought:  is your hum issue on all inputs or just on the RIAA phono inputs?

Frank

[Wayner]

Vincent,

I have several systems in my vinyl room and if one particular tuner is turned on, it's power supply transformer radiates enough strength, that it will induce hum into my AVA Insight+ EC preamp. I suspect this may be what is happening.

All equipment have transformers. Some transformers create stronger EMF then others. When they are on, they can affect the preamp. Separating them by distance can solve the problem. I suggest that if you have any pieces that are near the preamp, that you try to move them (even including the amp), as all pieces are candidates for making trouble.

Wayner

[iamjaymo]

Duh, apologies for my dumb post, the OP said ground loop hum - the Humdinger won't help with a ground loop hum.

[Wayner]

No need to apologize, I think the OP doesn't have anything eliminated as the cause. This is not an easy process, as the hum may be from a ground loops as you have mentioned, but it can be from EMF, or it can even be mechanical. The OP has stated that he has a hum problem, but has not come forward with any other details.

Wayner

[audiogoober]

My two monoblocks started humming...just the amps and nothing else. I shut off all circuits except my dedicated lines. I have three of them, so I tried the test with only one line on at a time with just the amps plugged in and nothing else. The amps still hum. I tried a cheater plug to rule out the ground(s).

I think it's possibly dc voltage coming from a new neighbor or possibly from my power company.

I'm going to try the humdingers and will keep everyone posted.

[iamjaymo]

My two monoblocks started humming...just the amps and nothing else. I shut off all circuits except my dedicated lines. I have three of them, so I tried the test with only one line on at a time with just the amps plugged in and nothing else. The amps still hum. I tried a cheater plug to rule out the ground(s).

I think it's possibly dc voltage coming from a new neighbor or possibly from my power company.

I'm going to try the humdingers and will keep everyone posted.

Same thing here, I have a hum in my 400R. It's only slightly annoying. It usually doesn't interrupt listening sessions, but it's there, and I know it, so looks like the Humdinger is in my future as well.

[audiogoober]

Same thing here, I have a hum in my 400R. It's only slightly annoying. It usually doesn't interrupt listening sessions, but it's there, and I know it, so looks like the Humdinger is in my future as well.

Did you try turning off all the circuits in your home except for one...then plug only the 400R directly into that one live circuit? Do the test with the stock/original power cord and make sure the unit has all interconnects and speaker cables disconneted.

This test was the final straw for me, and confirmed the hum is either coming from within the amp itself of something on the incoming power line to my house. Most likely DC voltage so the Humdinger will hopefully do the trick for me...

[iamjaymo]

My basement circuit is separate so I turned everything thing off and had just the amp on and it still had a hum.  Emailed Frank and it looks like the Humdinger will fix it...hope so...