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SE84UFO Hi Frequency Noise after warm up (Read 1042 times)
DJFreon
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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
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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
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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
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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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