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SE84UFO Hi Frequency Noise after warm up (Read 1880 times)

DJFreon Senior Member Posts: 61	SE84UFO Hi Frequency Noise after warm up 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?
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Geno Seasoned Member Without music, life would be a mistake. Posts: 2219	Re: SE84UFO Hi Frequency Noise after warm up Reply #1 - 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
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Tony Seasoned Member "Life without ..music is inconceivable" A.Einsteln Posts: 744	Re: SE84UFO Hi Frequency Noise after warm up Reply #2 - 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.
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CAJames

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Re: SE84UFO Hi Frequency Noise after warm up
Reply #3 - 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.

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JBzen Seasoned Member Posts: 1525	Re: SE84UFO Hi Frequency Noise after warm up Reply #4 - 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.
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