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Never heard an amp do this before, ideas?

I have a primaluna 100 unplugged from any inputs. It has this awful high pitched sound coming from the speakers when it's turned on. It happens on both channels, and through headphones.

I have turned off all electricity in the apartment, turned all breakers off except the one it's on, moved the amp around the apartment, tried a humx, and different power cables. I even replaced the unit with another primaluna and they both do it.

I'm running out of ideas, anyone ever seen this before?

 

hobbes101
hobbes101 OP
9 posts
 

@ieales thanks for the suggestions, I purchased some plugs and I'll try that!

 

I have svs speaker cables, but it happened with headphones and no cables too.

mikhailf
6 posts
 

i had the same issue with avr in past. the repair shop said they couldn't figure out where it was bad ground and the manufacturer sent me a replacement unit under warranty.

ieales's avatar
ieales
1,201 posts
 

I have svs speaker cables, but it happened with headphones and no cables too.

Does the amp have a headphone jack and you hear it with headphones and no speakers attached?

knock1
194 posts
 

Kind of off the subject. Is it not detrimental for tube amp not having a load (speaker connected) on the output while being turned on? From the video it looks like the speaker is connected to only one channel. I could be wrong, but I think it is a no-no.

hobbes101 OP
9 posts
 

@ieales yes, it has a headphone jack and I unattached the speakers, the sound comes through the headphones.

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