DIY line isolation transformer? (Luxman lt-1000 similar?)

-I am completely newbie what it comes to electronics, i have built a kit pre but thats it. Asking advice about choosing right transformer:

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My friend has Luxman lt-1000 between his dac and preamplifier, and i like what it is doing.
Also it seemed to make something audible to the sound overall which i liked.
I haven't come across this kind of device before so read about it and understood that basic principle is to get rid of ground loops with line transformer.

https://www.jensen-transformers.com/what-is-a-ground-loop/

Anyway, in my summer house there is grounding problems with signal route, so i want to try any kind of solution to get rid of it.
(and also try it in my main system, littlebit of hum in there)

I have ordered cheap one from Audiophonics (Audio isolation transformer), but if it works out i would like to try to make a good sounding one myself.

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-Maybe this is more than bit overkill, but does line magnetics have transformer in its line that could work here?
IT-01/25? IT-05?
https://www.monolithmagnetics.com/products

-Lundahl?
if you have experience with this, would you recommend some other manufacturer? vintage? open to try anything here..
 

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