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Glassware ACF-2 Aikido hum problem
Glassware ACF-2 Aikido hum problem
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Old 20th November 2017, 07:03 PM   #71
MrJackson is offline MrJackson  Romania
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Join Date: Feb 2014
Location: Bucharest, Romania
Finally, success!

Thanks to pl802, a solution has surfaced!!! diyAudio - My DIY projects

Reading the post about hum there, I noticed the description about how mismatched capacitors produce 120hz hum while a center tap that's not exactly centered produces a 60hz hum. I disconnected the center tap from the board and... No more 50hz hum. Remember, I'm from Europe. Now, I have a 100hz hum, but much smaller (consistent with the post, which said that a trafo CT issue produced a much higher hum than the mismatched capacitors)

There's still some hum, but now I know how to fix it... and in the meantime I can live with it, unlike before when it made me feel like putting an axe through it.
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Old 20th November 2017, 07:25 PM   #72
pl802 is offline pl802  United Kingdom
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Join Date: Apr 2011
Location: london
Great!!
But it's all thanks to alexcp.
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Old 20th November 2017, 07:45 PM   #73
MrJackson is offline MrJackson  Romania
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Join Date: Feb 2014
Location: Bucharest, Romania
True that! Thank you, everyone. Hopefully this will help the other guys who had trouble with theirs.
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