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Home recording studio - noise with guitar amps - who to call?
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BrianHG:
Looking at my old location:



You can see that I lived 175 meters / 0.1 miles from the high tension power lines feeding part of the city of Montreal, supplying a population of 1.8 million people.  Worse, I was 500meters / 0.3 miles from the booster station at the bottom left.

Believe me when I say, all the really sensitive analog electronics I worked on has measurable interference on my oscilloscope.  My 75Hz 21inch studio grade CRT computer monitors would also vibrate the image like mad on some days unless I used a 60Hz, 90hz, or 120Hz video modes.  There is nothing the power company can do as the transformer station and power lines when heavily loaded will radiate out.  The field was strong enough to illuminate a white LEDs just by touching 1 side to a long metal beam part of my workbench table with the other wire contact held in my hand.
DrGeoff:
Can you add a filter to the mains supply for the guitar amp?
A balanced EMI filter might be worth trying to eliminate conducted noise on the mains.
BrianHG:

--- Quote from: DrGeoff on November 21, 2022, 01:44:38 am ---Can you add a filter to the mains supply for the guitar amp?
A balanced EMI filter might be worth trying to eliminate conducted noise on the mains.

--- End quote ---

Not a mains issue, read his post.


--- Quote from: DaveNJ on November 21, 2022, 01:36:05 am ---Non-magnetic pickups certainly sound different - the EMGs I have in that one guitar are not susceptible to interference, but they aren’t regarded as “the best sounding”. Now, vintage guitars with old p90 pickups are some of the best sounding, but also the most susceptible.

--- End quote ---

Your chances have diminished.

If it were mains interference, the amp's input and wiring would replicate the same 60hz hum on his EMG guitars as the magnetic coil guitars.  It is truly a magnetic field transmission like what I had at my old location where even computer monitor electron guns where being pushed in and out over-driving the deflection 'YOKE' due to the 60hz magnetic field.

Only 360 degree, below and above copper plate shielding might clean this up.
DaveNJ:

--- Quote from: BrianHG on November 21, 2022, 01:39:20 am ---Looking at my old location:



You can see that I lived 175 meters / 0.1 miles from the high tension power lines feeding part of the city of Montreal, supplying a population of 1.8 million people.  Worse, I was 500meters / 0.3 miles from the booster station at the bottom left.

Believe me when I say, all the really sensitive analog electronics I worked on has measurable interference on my oscilloscope.  My 75Hz 21inch studio grade CRT computer monitors would also vibrate the image like mad on some days unless I used a 60Hz, 90hz, or 120Hz video modes.  There is nothing the power company can do as the transformer station and power lines when heavily loaded will radiate out.  The field was strong enough to illuminate a white LEDs just by touching 1 side to a long metal beam part of my workbench table with the other wire contact held in my hand.

--- End quote ---


You know, looking at the image you posted, I may have misstated something - I’m not .2mi from high tension wires, I’m .2mi away from above ground, residential power lines. The towers are a good 10 miles or so away…

I’ll let you know what the power company says…
BrianHG:

--- Quote from: DaveNJ on November 21, 2022, 03:22:12 am ---You know, looking at the image you posted, I may have misstated something - I’m not .2mi from high tension wires, I’m .2mi away from above ground, residential power lines. The towers are a good 10 miles or so away…

I’ll let you know what the power company says…

--- End quote ---
See what your power company can do.  You should not be having the problem I was having as those transformers in my attached image 0.3mi from my house power ~25% of a city.  I'm not talking about the tiny telephone pole style transformers which only power a few houses.  (I feel sorry for those houses whose back yards are just across the street from that booster station, within ~0.05miles.)

The only other thing I can think of is if somebody right next door, or withing the same building has some big ass machine with a huge AC motor or giant transformer running 24/7.
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