Naked Science Forum
General Science => General Science => Topic started by: Marika on 25/06/2018 15:39:27
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Tracy wants to know:
How far I should keep a guitar amplifier (120w) and a set of 1980's floor speakers (120w) away from an older standard definition tv?
I have searched and searched for the answer to my question without being able to find any info (that I am able to comprehend) on this subject. I know that if electronics with huge magnets are set right next to an older standard def tv that it will distort the colors (unfortunately I had it happen to me about 20 yrs ago).
But what is a safe distance between the tv and the speakers/guitar amp/ I have my amp in an entertainment center with a on-half inch board between my tv and amp. I didn't know if a buffer such as a board (entertainment center would help with my problem.
What do you think?
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Here's the Kitchen Science experiment we did to explain why magnets and televisions don't mix... (https://www.thenakedscientists.com/get-naked/experiments/magnets-and-tvs)
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How far I should keep a guitar amplifier (120w) and a set of 1980's floor speakers (120w) away from an older standard definition tv?
The amplifier probably won't cause too many problems. The main magnetic field is from the transformers, and these are fairly well shielded with a closed magnetic path.
The loudspeakers create a magnetic field in the space where the voice call moves. This will affect the TV more.
I didn't know if a buffer such as a board (entertainment center would help with my problem.
Try to separate the speaker as far as possible from the TV. I can't give any specific distance, as it depends on too many factors.
A wooden board does not significantly reduce magnetic fields.
A thin sheet of non-magnetised iron would reduce the field significantly. In fact, most TVs have a magnetic shield around the rear of the picture tube (it's a bit harder to put a magnetic shield over the viewing area!).
If you find that the colors have been distorted, color TVs have a "degaussing circuit" which is often activated when the TV is first turned on. Remove the external magnetic field.Turn the TV off at the front panel, then disconnect it at the wall for 5 minutes. Plug it in again and turn it on. Hopefully, the color fringes should now be gone...
those expensive flat LCD screens
The economics have changed significantly!
LCD screens are now quite cheap, and aren't affected by external magnetic fields.
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the thermistor devices that feed the degaussing coil often fail with the result of a rainbow on the screen of the TV.
They have only three connections and are easy to replace if you want to carry on using a vintage TV.