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Old 9th May 2018, 08:25 PM   #1
phyciocc is offline phyciocc  United States
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Join Date: Dec 2013
Location: KY
Default 60 hz hum, right channel, Elekit TU-8200 (non-dx)

Hello everyone:
I have a elekit tu-8200 (non-dx). After years of stellar service, the amp has developed what seems a 60hz hum in the right channel. It is not very loud but is is there (it was not there before).
The hum is independent of the volume knob, and exists with nothing at the inputs.

I swapped the opt and no change. Swapped pre-amp tubes, no change. Swapped output tubes, no change.
It seems a component at this point. Any pointers?
Thank you for all and any info you can provide.
Marco
p.s. I am a kit builder, not a DIY self-er...
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Old 10th May 2018, 05:44 PM   #2
vkung is offline vkung  Canada
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Please check the right channel FET filter. Did you do tube rolling?

Last edited by vkung; 10th May 2018 at 05:57 PM.
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Old 10th May 2018, 06:38 PM   #3
phyciocc is offline phyciocc  United States
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Join Date: Dec 2013
Location: KY
Hello:
Thanks for the reply and pointer.
I have the tubes that came standard with the kit (output are electro harmonix 6L6 GC). I also have used KT 88 as output . The amp is connected with the jumpers in pentode mode. The hum is present using both types of output tubes. I will check the fet.
Marco

Marco
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Old 10th May 2018, 06:41 PM   #4
vkung is offline vkung  Canada
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99% the FET WAS DAMAGED
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Old 17th May 2018, 09:03 PM   #5
phyciocc is offline phyciocc  United States
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Join Date: Dec 2013
Location: KY
Smile Fixed!

Hello Viktor:
You were right. At first, touching around, I had managed to make the hum appear on both channels. Probably damaged the mosfet on the left channel too...
I ended up replacing all four MOSFETS (02n60ZH) and all is fine again.I am happy to have ordered 8, so now I have a spare set.

The original mosfets appear discontinued, so I got the only replacements I could find on the Mouser website. They are not quite the same (they are a bit smaller and have no hole to screw mount them, 02n60ZG) but the ratings (600V 4.8Ohm) appear similar.



Thanks!
Marco

Last edited by phyciocc; 17th May 2018 at 09:22 PM.
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Old 2nd June 2018, 08:56 AM   #6
logo11 is offline logo11  United States
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Join Date: Nov 2010
Thumbs up super

Quote:
Originally Posted by phyciocc View Post
Hello Viktor:
You were right. At first, touching around, I had managed to make the hum appear on both channels. Probably damaged the mosfet on the left channel too...
I ended up replacing all four MOSFETS (02n60ZH) and all is fine again.I am happy to have ordered 8, so now I have a spare set.

The original mosfets appear discontinued, so I got the only replacements I could find on the Mouser website. They are not quite the same (they are a bit smaller and have no hole to screw mount them, 02n60ZG) but the ratings (600V 4.8Ohm) appear similar.



Thanks!
Marco
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