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When tying a knot solves most of the hum issue!
When tying a knot solves most of the hum issue!
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Old 13th October 2019, 10:11 PM   #1
kodabmx is offline kodabmx  Canada
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When tying a knot solves most of the hum issue!
Default When tying a knot solves most of the hum issue!

Yup... 120Hz hum even though the amplifier is powered by switching supplies... A simple knot fixed most of it...

Never be afraid to try the cheap solution first LMAO.
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Old 13th October 2019, 10:17 PM   #2
Galu is online now Galu  Scotland
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Can't say I'm knot impressed!
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Old 13th October 2019, 10:25 PM   #3
tomchr is offline tomchr  Canada
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That's hilarious. It'd be interesting to play a bit more to understand what changes. Are you putting more strain/stress on the connectors, thereby causing them to connect better or something?

Tom
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Old 13th October 2019, 10:43 PM   #4
chrisb is offline chrisb
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Have you submitted your patent application yet? If not the boys at Monster will scoop it out from underneath you.
All kidding aside, if it works, it works.
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Old 13th October 2019, 10:58 PM   #5
vinylkid58 is offline vinylkid58  Canada
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When tying a knot solves most of the hum issue!
Quote:
Originally Posted by kodabmx View Post
Yup... 120Hz hum even though the amplifier is powered by switching supplies... A simple knot fixed most of it...
I did that to a speaker wire once, and an EE friend saw it and said I had created a filter.
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Old 13th October 2019, 11:52 PM   #6
Galu is online now Galu  Scotland
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Quote:
Originally Posted by kodabmx View Post
A simple knot fixed most of it...
C'mon - where have you hidden the op-amps?
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Old Yesterday, 12:05 AM   #7
Fast Eddie D is offline Fast Eddie D  United States
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I took apart a flat screen TV (scavenger hunt) and saw that the mains power lead was looped once through a ferrite cylinder. I did some internet sleuthing and found out that this was a ground loop breaker scheme for eliminating hum. I took it out and used in my preamplifier.

Does it work? Well there's no hum or ground loops. I've made it a point to grab these out of any flat screen I see in the electronic recycle dumpster. I also saw where Mouser and Digi-Key sell these.
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Old Yesterday, 12:39 AM   #8
wiseoldtech is online now wiseoldtech  United States
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Quote:
Originally Posted by Fast Eddie D View Post
I took apart a flat screen TV (scavenger hunt) and saw that the mains power lead was looped once through a ferrite cylinder. I did some internet sleuthing and found out that this was a ground loop breaker scheme for eliminating hum. I took it out and used in my preamplifier.

Does it work? Well there's no hum or ground loops. I've made it a point to grab these out of any flat screen I see in the electronic recycle dumpster. I also saw where Mouser and Digi-Key sell these.

Indeed, ferrite chokes are good for eliminating certain interferences.
I've got a couple of them clipped around various devices around the house.
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Old Yesterday, 10:43 AM   #9
DF96 is offline DF96  England
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If the knot is actually solving the problem, then the problem is due to quite high frequency RF. However, more likely that the knot is a coincidence.
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Old Yesterday, 12:09 PM   #10
jneutron is offline jneutron  United States
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Quote:
Originally Posted by kodabmx View Post
Yup... 120Hz hum even though the amplifier is powered by switching supplies... A simple knot fixed most of it...

Never be afraid to try the cheap solution first LMAO.
Is that cable from a turntable?
Is that green alligator clip jumper your phono ground?

If both are yes, it is proximity between then that reduces ground loop hum.
I wrap my to ground tightly around the tt cables up to the binding post.

Jn
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