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EQUIPMENT FORUMS >> SE84UFO >> SE84UFO Hi Frequency Noise after warm up
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Message started by DJFreon on 09/30/22 at 11:22:00

Title: SE84UFO Hi Frequency Noise after warm up
Post by DJFreon on 09/30/22 at 11:22:00

I have a SE84UFO amplifier that making a hi frequency noise after it warms up.
Can anyone shed some light on what is happening?

Title: Re: SE84UFO Hi Frequency Noise after warm up
Post by Geno on 09/30/22 at 12:17:43

Sounds like a ground loop to me. You might check the routing of your interconnects and power cable to see if that changes anything.

Best,

Geno

Title: Re: SE84UFO Hi Frequency Noise after warm up
Post by Tony on 09/30/22 at 14:37:29

I had a hum in my amp last week. I called Decware to schedule an appointment and was lucky enough to talk to Steve. He assessed my problem accurately, which led to a quick fix.

Title: Re: SE84UFO Hi Frequency Noise after warm up
Post by CAJames on 09/30/22 at 15:52:06

My suggestion is to try it with no input connected and see if the problem persists. If it does you can try moving it to a different circuit in a different room and/or trying new tubes and/or talking to Steve. High frequency noise sounds more like electromagnetic interference (EMI) or possibility a noisy tube than a ground loop to me, but I don't claim to be an expert so JMO/FWIW/YMMV and all that.

Title: Re: SE84UFO Hi Frequency Noise after warm up
Post by JBzen on 09/30/22 at 16:03:18

Yeah, a noisy tube will cause a high pitch hum. My SE84 rectifier tube makes a noise like that. Still using it, because I like it! Can't hear it in the speakers or my listening position.