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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
ieales's avatar
ieales
1,201 posts
 

Does it happen on all inputs of the integrated amp?

What happens with a shorting plug in the inputs?

What happen with a shorting plung and the speakers disconnected? You will have to measure with a scope or good multimeter/

What are your speaker cables?

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
237 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.

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